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List of North American dinosaurs
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This is a list of dinosaurs whose remains have been recovered from North America. North America has a rich dinosaur fossil record with great diversity of dinosaurs.
History
The earliest potential record of dinosaurs in North America comes from rare, unidentified (possibly theropod) footprints in the Middle-Late Triassic Pekin Formation of North Carolina. However, the most reliable early record of North American dinosaurs comes from fragmentary saurischian fossils unearthed from the Late Triassic Dockum Group of Texas. Later in the Triassic period, dinosaurs left more recognizable remains, and could be identified as specific genera. Examples include Coelophysis, Chindesaurus, Gojirasaurus, and Tawa. Fossils of Tawa-like dinosaurs have also been found in South America, which has implications for paleogeography. During the Early Jurassic, dinosaurs such as Dilophosaurus, Anchisaurus, Podokesaurus, and the early thyreophoran Scutellosaurus lived in North America. The latter is thought ancestral to all stegosaurs and ankylosaurs. The Middle Jurassic is the only poorly represented period in North America, although several Middle Jurassic localities are known from Mexico. Footprints, eggshells, teeth, and fragments of bone representing theropods, sauropods, and ornithopods have been found, but none of them are diagnostic to the genus level.
The Late Jurassic of North America, however, is the exact opposite of the Middle Jurassic. The Late Jurassic Morrison Formation is found in several U.S. states, including Colorado, Utah, Wyoming, Montana, New Mexico, Oklahoma, South Dakota, and Texas. It is notable as being the most fertile single source of dinosaur fossils in the world. The roster of dinosaurs from the Morrison is impressive. Among the theropods, Allosaurus, Torvosaurus, Ceratosaurus, Coelurus, Ornitholestes, Tanycolagreus, Stokesosaurus, and Marshosaurus are found in the Morrison. An abundance of sauropods has been found there, including Apatosaurus, Diplodocus, Barosaurus, Brachiosaurus, Camarasaurus, Brontosaurus and Amphicoelias. Three genera of stegosaurs, Alcovasaurus, Stegosaurus and Hesperosaurus, have been found there. Finally, neornithischians found in the Morrison include Camptosaurus, Dryosaurus, and Nanosaurus.
During the Early Cretaceous, new dinosaurs evolved to replace the old ones. Sauropods were still present, but they were not as diverse as they were in the Jurassic Period. Theropods from the Early Cretaceous of North America include dromaeosaurids such as Deinonychus and Utahraptor, the carnosaur Acrocanthosaurus, and the coelurosaur Microvenator. Sauropods included Astrodon, Brontomerus, and Sauroposeidon. Ornithischians were more diverse than they were in the Jurassic Period. Tenontosaurus, Dakotadon, and Hippodraco are some of the ornithopods that lived during this time period. Ankylosaurs replaced their stegosaur cousins in the Cretaceous. Ankylosaurs from the Early Cretaceous of North America include Sauropelta and Gastonia. Therizinosaurs such as Falcarius are also known from the Early Cretaceous of North America.
Finally, during the Late Cretaceous Period, dinosaurs continued to diversify, with the Cenomanian stage seeing the rise of hadrosaurs such as Eolambia and Protohadros, as well as tyrannosaurs such as Moros intrepidus, which would make the carnosaurs, like Siats, as the continent's apex predators. These groups continued to thrive into the Turonian stage, in which therizinosaurs like Nothronychus, and larger ceratopsians such as Zuniceratops lived. During the Campanian stage of the Late Cretaceous, an enormous diversity of dinosaurs is known. Theropods included the tyrannosaurs Albertosaurus, Gorgosaurus, Daspletosaurus, Teratophoneus, Bistahieversor, and Appalachiosaurus, and the dromaeosaurids Dromaeosaurus, Saurornitholestes, Atrociraptor, and Bambiraptor. Ceratopsians, such as Pachyrhinosaurus, Styracosaurus, Centrosaurus, Monoclonius, Brachyceratops and Pentaceratops also existed. Among hadrosaurs,* Hypacrosaurus, Gryposaurus, Kritosaurus, Parasaurolophus*, Corythosaurus, Lambeosaurus and Prosaurolophus existed. During the latest Cretaceous, the Maastrichtian age, the diversity of dinosaurs saw a decline from the preceding Campanian stage. North American herbivorous dinosaurs from this time period include the titanosaur sauropod Alamosaurus, the ceratopsians Bravoceratops, Regaliceratops, Triceratops, Leptoceratops, Torosaurus, Ojoceratops, Nedoceratops, and Tatankaceratops (the latter two possible synonyms of Triceratops), the pachycephalosaurs Pachycephalosaurus, Sphaerotholus, Stygimoloch, and Dracorex (the latter two possible synonyms of Pachycephalosaurus), the hadrosaurs Augustynolophus, Saurolophus, and Edmontosaurus, the neornithischian Thescelosaurus, the ankylosaurid Ankylosaurus and the nodosaurids Denversaurus, Glyptodontopelta, and Edmontonia. Predatory dinosaurs from this time period included the tyrannosaurids Tyrannosaurus, Nanotyrannus (which may just be a juvenile of the former), and Dryptosaurus, the ornithomimids Ornithomimus, Dromiceiomimus, Struthiomimus, the oviraptorids Anzu, Leptorhynchos and Ojoraptorsaurus, the troodontids Pectinodon, Paronychodon and Troodon, the coelurosaur Richardoestesia and the dromaeosaurs Acheroraptor and Dakotaraptor.
The only recorded find of a dinosaur fossil in Central America consists of a single femur discovered from mid Cretaceous-aged deposits in Comayagua Department in the central part of Honduras. The fossil had been found in January, 1971 by Bruce Simonson and Gregory Horne, though it was later sent to the National Museum of Natural History, USA where it is deposited under catalogue number USNM PAL 181339. The discovery was not formally described until 1994 where it was identified as the femur of a small hadrosaur or iguanodontid, probably the former. The first report of a dinosaur from Central America ever however was a newspaper article published in August of 1933 by Canada's Montreal Gazette, though the story was picked up by several American newspapers. The fossil was an isolated metatarsus that had been collected by University of Pennsylvania explorer George Mason from woods near Olanchito, Honduras, though a vertebra was also mentioned to be found by locals. The bones have since been lost and their true identity remains indeterminable.
Criteria for inclusion
- The genus must appear on the List of dinosaur genera.
- At least one named species of the creature must have been found in North America.
List of North American dinosaurs
Valid genera
| Name | Year | Formation | Location | Notes | Images | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Abydosaurus | 2010 | Cedar Mountain Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Had a short domed crest on its skull similar to that of Giraffatitan | [[File:Abydosaurus NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Acantholipan | 2018 | Pen Formation (Late Cretaceous, Santonian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | Known to possess spike-like osteoderms | [[File:Acantholipan gonzalezi.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Achelousaurus | 1994 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Combines long spikes on the top of its frill and a low keratinous boss over its eyes and nose | [[File:Achelousaurus dinosaur.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Acheroraptor | 2013 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | One of the geologically youngest dromaeosaurids | [[File:Acheroraptor NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Acristavus | 2011 | Two Medicine Formation, Wahweap Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Utah) | Uniquely for a hadrosaurid, it lacked any ornamentation on its skull | [[File:Acristavus gagslarsoni.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Acrocanthosaurus | 1950 | Antlers Formation, Arundel Formation, Cloverly Formation, Twin Mountains Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Maryland | ||||||||||||||||||||||||||||||||||||||
| Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Texas | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Possessed elongated neural spines that would have supported a low sail or hump in life | [[File:Acrocanthosaurus atokensis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Acrotholus | 2013 | Milk River Formation (Late Cretaceous, Santonian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had a tall, oval-shaped dome | [[File:Acrotholus NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Adelolophus | 2014 | Wahweap Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Potentially a close relative of Parasaurolophus | [[File:Adelolophus LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Agujaceratops | 2006 | Aguja Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | The type species was originally assigned to the genus Chasmosaurus | [[File:Agujaceratops life restoration.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ahshislepelta | 2011 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Relatively small compared to other North American ankylosaurs | [[File:Ahshislepelta LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Ahshislesaurus | 2025 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | The type specimen was originally considered to belong to Kritosaurus but it has been later found to be likely more closely related to Naashoibitosaurus | [[File:Ahshislesaurus wimani.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Ahvaytum | 2025 | Popo Agie Formation (Late Triassic, Carnian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | One of the oldest North American dinosaurs | [[File:Ahvaytum bahndooiveche.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Akainacephalus | 2018 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Much of the skeleton is known, including the entirety of the skull | [[File:Akainacephalus (updated).png | 200px]] | |||||||||||||||||||||||||||||||||||
| Alamosaurus | 1922 | Ojo Alamo Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | The first titanosaur confirmed to have crossed into North America, possibly representing a relative of South American forms | [[File:Alamosaurus-sanjuanensis.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Alaskacephale | 2006 | Prince Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Alaska) | Had an array of polygonal nodes on its squamosal | [[File:Alaskacephale gangloffi copia.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Albertaceratops | 2007 | Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed long brow horns and a bony ridge over its nose | [[File:Albertaceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Albertadromeus | 2013 | Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | The proportions of its hindlimb suggest a cursorial lifestyle | [[File:Albertadromeus LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Albertavenator | 2017 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Its discovery suggests that the diversity of small dinosaurs may be higher than previously thought | [[File:Albertavenator LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Albertonykus | 2009 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | May have used its specialized forelimbs to dig into tree trunks for feeding on termites | [[File:Albertonykus borealis.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Albertosaurus | 1905 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Known from more than thirty specimens, twenty-six of which are preserved together | [[File:Albertosaurus NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Aletopelta | 2001 | Point Loma Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (California) | Would have lived in present-day Mexico. Its fossils were only found in California due to the shifting of tectonic plates | [[File:Aletopelta NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Allosaurus | 1877 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Multiple specimens have been discovered, making it well-known both popularly and scientifically. At least three species are known from the United States, in addition to one described from Portugal | [[File:Allosaurus Revised.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ampelognathus | 2023 | Lewisville Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Originally described as a close relative of a clade containing Thescelosaurus and iguanodonts, but it was recovered as a rhabdodontomorph by subsequent research | [[File:Ampelognathus TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Amphicoelias | 1878 | Morrison Formation (Late Jurassic, Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Originally believed to date from the Cretaceous | [[File:Amphicoelias17DB2.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Anasazisaurus | 1993 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | May have been a second species of Kritosaurus | [[File:Anasazisaurus LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Anchiceratops | 1914 | Horseshoe Canyon Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had a long, rectangular frill ringed by short, triangular spikes | [[File:Anchiceratops dinosaur.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Anchisaurus | 1885 | Portland Formation (Early Jurassic, Hettangian to Sinemurian) | United States | |||||||||||||||||||||||||||||||||||
| (Connecticut | ||||||||||||||||||||||||||||||||||||||
| Massachusetts) | Some possible remains were originally misidentified as human skeletons | [[File:Anchisaurus NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Angulomastacator | 2009 | Aguja Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | The tip of its jaw was angled 45° at its anterior end, with the tooth row bent to match | [[File:Life reconstruction of Angulomastacator daviesi.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Animantarx | 1999 | Cedar Mountain Formation (Early Cretaceous to Late Cretaceous, Albian to Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Its holotype was discovered during a radiological survey of a fossil site. No bones were exposed before it was excavated | [[File:Animantarx ramaljonesi.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Ankylosaurus | 1908 | Ferris Formation, Frenchman Formation, Hell Creek Formation, Lance Formation, Scollard Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | The largest and most well-known ankylosaur | [[File:Ankylosaurus magniventris by sphenaphinae.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Anodontosaurus | 1929 | Dinosaur Park Formation, Horseshoe Canyon Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Originally mistakenly believed to have been toothless | [[File:Anodontosaurus LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Anzu | 2014 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| North Dakota | ||||||||||||||||||||||||||||||||||||||
| South Dakota) | Large and known from considerably good remains. Preserves evidence of a tall head crest | [[File:Anzu wyliei.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Apatoraptor | 2016 | Horseshoe Canyon Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Quill knobs preserved on its ulna confirm this genus had wings | [[File:Apatoraptor NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Apatosaurus | 1877 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| New Mexico | ||||||||||||||||||||||||||||||||||||||
| Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Had a characteristically robust skeleton compared to other diplodocids | [[File:Apatosaurus louisae by durbed.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Appalachiosaurus | 2005 | Blufftown Formation?, Demopolis Chalk, Donoho Creek Formation?, Ripley Formation?, Tar Heel/Coachman Formation? (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Alabama | ||||||||||||||||||||||||||||||||||||||
| Georgia (U.S. state)? | ||||||||||||||||||||||||||||||||||||||
| North Carolina? | ||||||||||||||||||||||||||||||||||||||
| South Carolina?) | The most complete theropod known from the eastern side of North America | [[File:Appalachiosaurus montgomeriensis.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Aquilarhinus | 2019 | Aguja Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | May have been a semiaquatic, coastal species that used its unusual, shovel-shaped bill to scoop up vegetation in wet sediment | [[File:Aquilarhinus LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Aquilops | 2014 | Cloverly Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | May have had a short horn protruding from its upper beak | [[File:Aquilops NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ardetosaurus | 2024 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | The holotype specimen was damaged by a museum fire | [[File:Ardetosaurus viator (life restoration).png | 200px]] | |||||||||||||||||||||||||||||||||||
| Arkansaurus | 2018 | Trinity Group (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Arkansas) | State dinosaur of Arkansas. Its generic name was in use informally even before its formal description | [[File:Arkansaurus NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Arrhinoceratops | 1925 | Horseshoe Canyon Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Described as lacking a nasal horn although this is an artifact of preservation | [[File:Arrhinoceratops UDL.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Astrodon | 1865 | Antlers Formation?, Arundel Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Maryland | ||||||||||||||||||||||||||||||||||||||
| Oklahoma?) | State dinosaur of Maryland | [[File:Astrodon johnstoni.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Astrophocaudia | 2012 | Paluxy Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Known from a single partial skeleton | [[File:Astrophocaudia LM.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Athenar | 2025 | Morrison Formation (Late Jurassic, Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Originally believed to be a diplodocid | [[File:Athenar bermani.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Atlantosaurus | 1877 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | doi = 10.7717/peerj.857 | title = A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda) | journal = PeerJ | volume = 3 | article-number = e857 | year = 2015 | last1 = Tschopp | first1 = E. | last2 = Mateus | first2 = O. V. | last3 = Benson | first3 = R. B. J. | pmid=25870766 | pmc=4393826 | doi-access = free}} | [[File:Atlantosaurus montanus.jpg | 200px]] | |||||||||||||||||||||
| Atrociraptor | 2004 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had a short, deep snout with enlarged teeth | [[File:Atrociraptor.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Aublysodon | 1868 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Only known from teeth | [[File:Aublysodon.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Augustynolophus | 2014 | Moreno Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (California) | State dinosaur of California. Originally named as a species of Saurolophus | [[File:Augustynolophus NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Avaceratops | 1986 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Lacked the fenestrae in its frill, a feature shared only with Triceratops | [[File:Avaceratops dinosaur.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Bambiraptor | 2000 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Small but well-preserved enough to display its mix of dinosaur- and bird-like features | [[File:Bambiraptor reconstruction.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Barosaurus | 1890 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota | ||||||||||||||||||||||||||||||||||||||
| Utah) | Similar to Diplodocus but larger and with a longer neck | [[File:Barosize.svg | 200px]] | |||||||||||||||||||||||||||||||||||
| Bistahieversor | 2010 | Fruitland Formation, Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Analysis of its braincase suggests it behaved like tyrannosaurids despite likely not being a member of that family | [[File:Bihastieversor NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Bisticeratops | 2022 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Preserves bite marks from a tyrannosaurid | [[File:Bisticeratops Life Reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Borealopelta | 2017 | Clearwater Formation (Early Cretaceous, Albian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | So well-preserved that several osteoderms, keratin, pigments and stomach contents are preserved in the positions they would have been in while alive, without flattening or shriveling | [[File:Borealopelta NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Boreonykus | 2015 | Wapiti Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | One of the few dromaeosaurids known from high latitudes | [[File:Boreonykus LM.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Brachiosaurus | 1903 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | A high browser with a tall chest and elongated forelimbs | [[File:Brachiosaurus NT new.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Brachyceratops | 1914 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Only known from juvenile remains. One specimen has been found to represent a subadult Styracosaurus ovatus | [[File:Brachyceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Brachylophosaurus | 1953 | Judith River Formation, Oldman Formation, Wahweap Formation? (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Utah?) | Several specimens preserve extensive soft tissue remains | [[File:Brachylophosaurus NT alternate.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Bravoceratops | 2013 | Javelina Formation (Late Cretaceous, Campanian to Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Suggested to have had a single small horn on the top of its frill but this may be inaccurate | [[File:Bravoceratops skeletal.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Brontomerus | 2011 | Cedar Mountain Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Possessed an enlarged ilium which supported powerful leg muscles, which it may have used to kick away predators | [[File:Brontomerus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Brontosaurus | 1879 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Popularly associated with Apatosaurus but a 2015 study found enough differences for it to be classified as a separate genus | [[File:Brontosaurus by Tom Parker.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Brontotholus | 2025 | Oldman Formation, Two Medicine Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | One of the largest known North American pachycephalosaurs | [[File:Brontotholus harmoni.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Caenagnathus | 1940 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | One of the largest known caenagnathids | [[File:Caenagnathus mandible.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Camarasaurus | 1877 | Morrison Formation, Summerville Formation? (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| New Mexico? | ||||||||||||||||||||||||||||||||||||||
| Oklahoma? | ||||||||||||||||||||||||||||||||||||||
| South Dakota? | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Very common and known from multiple specimens | [[File:Camarasaurs1.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Camposaurus | 1998 | Bluewater Creek Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | Potentially the oldest known neotheropod | [[File:Camposaurus arizonensis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Camptosaurus | 1885 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | May have fed on tough vegetation as evidenced by extensive wear frequently exhibited on its teeth | [[File:Camptosaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Caseosaurus | 1998 | Tecovas Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Possibly synonymous with Chindesaurus | [[File:Caseosaurus ilium.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Cedarosaurus | 1999 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | One specimen preserves over a hundred gastroliths | [[File:Cedarosaurus SW.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Cedarpelta | 2001 | Cedar Mountain Formation (Late Cretaceous, Cenomanian to Turonian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Lacked the extensive cranial ornamentation of later ankylosaurids | [[File:Cedarpelta.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Cedrorestes | 2007 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Known from a partial skeleton. The specific name, crichtoni, honors Michael Crichton, author of Jurassic Park and The Lost World | [[File:Left ilium of Cedrorestes.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Centrosaurus | 1904 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Hundreds of individuals have been preserved in a single "mega-bonebed" | [[File:Centrosaurus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Cerasinops | 2007 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Combines features of both Asian and North American basal ceratopsians | [[File:Cerasinops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ceratops | 1888 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Although only known from a few bones, this genus is the namesake of the Ceratopsia and the Ceratopsidae | [[File:Ceratops.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ceratosaurus | 1884 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Possessed a row of osteoderms running down its back | [[File:Ceratosaurus nasicornis DB.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Chasmosaurus | 1914 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Known from multiple remains, including various skulls | [[File:Chasmosaurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Chindesaurus | 1995 | Chinle Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | May be a herrerasaur or a close relative of Tawa | [[File:Chindesaurus femur.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Chirostenotes | 1924 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Originally known only from isolated body parts | [[File:Volant Chirostenotes.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Cionodon | 1874 | Denver Formation, Judith River Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Colorado) | Poorly known | [[File:Cionodon arctatus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Citipes | 2020 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Some specimens were found as stomach contents of Gorgosaurus | [[File:Citipes elegans.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Claosaurus | 1890 | Niobrara Formation (Late Cretaceous, Santonian to Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Kansas) | Historically conflated with other hadrosaurs | [[File:Kansas sea2DB.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Coahuilaceratops | 2010 | Cerro Huerta Formation (Late Cretaceous, Maastrichtian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | Possessed brow horns comparable in size to those of Triceratops and Torosaurus | [[File:Life reconstruction of Coahuilaceratops (cropped).png | 200px]] | |||||||||||||||||||||||||||||||||||
| Coahuilasaurus | 2024 | Cerro del Pueblo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | Identified as a specimen of Kritosaurus before receiving its own genus name | [[File:Life reconstruction of Coahuilasaurus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Coelophysis | 1889 | Chinle Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona | ||||||||||||||||||||||||||||||||||||||
| New Mexico) | Known from over a thousand specimens, making it one of the most well-known early dinosaurs. Some referred species may belong to their own genera | [[File:Coelophysis size.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Coelurus | 1879 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Potentially an early member of the tyrannosauroid lineage | [[File:Coelurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Colepiocephale | 2003 | Foremost Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Originally described as a species of Stegoceras | [[File:Colepiocephale lambei.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Convolosaurus | 2019 | Twin Mountains Formation (Early Cretaceous, Aptian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Before its formal description, it had been informally referred to as the "Proctor Lake hypsilophodontid" | [[File:3d model Convolosaurus marri.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Coronosaurus | 2012 | Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had irregular masses of small spikes on the very top of its frill | [[File:Coronosaurus NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Corythosaurus | 1914 | Dinosaur Park Formation, Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed a semicircular crest which may have been used for vocalization | [[File:Life reconstruction of Corythosaurus casuarius.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Crittendenceratops | 2018 | Fort Crittenden Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | The youngest known member of the Nasutoceratopsini | [[File:Crittendenceratops shaded.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Daemonosaurus | 2011 | Chinle Formation (Late Triassic, Norian to Rhaetian?) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Unique among early dinosaurs for possessing a short snout with long teeth | [[File:Daemonosaurus chauliodus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Dakotadon | 2008 | Lakota Formation (Early Cretaceous, Valanginian to Barremian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota) | Originally named as a species of Iguanodon | [[File:Dakotadon restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Dakotaraptor | 2015 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota) | The holotype assemblage may represent a chimera of multiple taxa | [[File:Dakotaraptor wiki.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Daspletosaurus | 1970 | Dinosaur Park Formation, Judith River Formation, Oldman Formation, Two Medicine Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | At least three species are known. These have been interpreted as forming an anagenetic lineage but this hypothesis has been criticized | [[File:Daspletosaurus torosus steveoc.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Deinonychus | 1969 | Antlers Formation, Arundel Formation?, Cedar Mountain Formation?, Cloverly Formation (Early Cretaceous to Late Cretaceous, Aptian to Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Maryland? | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Utah? | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Its discovery helped researchers realize that dinosaurs were active, warm-blooded animals, kicking off the Dinosaur Renaissance | [[File:Deinonychus ewilloughby.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Denversaurus | 1988 | Hell Creek Formation, Lance Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | The youngest known nodosaurid | [[File:Denversaurus schlessmani scale.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Diabloceratops | 2010 | Wahweap Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Had a distinctively short, deep skull | [[File:Diabloceratops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Diclonius | 1876 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Replaced its teeth in such a way that new teeth could be used at the same time as older ones | |||||||||||||||||||||||||||||||||||||
| Dilophosaurus | 1970 | Kayenta Formation (Early Jurassic, Sinemurian to Toarcian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | Possessed two semicircular crests running along the length of the skull | [[File:Dilophosaurus with nest.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Dineobellator | 2020 | Ojo Alamo Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Several features of its hands and feet may be adaptations for increased grip strength | [[File:Dineobellator notohesperus NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Diplodocus | 1878 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian?) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| New Mexico | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Had a long, thin tail popularly thought to have been used like a bullwhip but it is possible that it could not handle the stress of supersonic travel | [[File:Diplodocus carnegii.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Diplotomodon | 1868 | Hornerstown Formation?/Navesink Formation? (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Jersey) | Has been suggested to be non-dinosaurian | [[File:Diplotomodon.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Dromaeosaurus | 1922 | Dinosaur Park Formation, Hell Creek Formation?, Horseshoe Canyon Formation?, Prince Creek Formation? (Late Cretaceous, Campanian to Maastrichtian?) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Alaska? | ||||||||||||||||||||||||||||||||||||||
| South Dakota?) | Analysis of wear on its teeth suggests it preferred tougher prey, including bone | [[File:Dromaeosaurus Restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Dromiceiomimus | 1972 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | May be synonymous with Ornithomimus edmontonicus | [[File:Dromiceiomimus 03747.JPG | 200px]] | |||||||||||||||||||||||||||||||||||
| Dryosaurus | 1894 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Remains of multiple growth stages have been found, including specimens in embryonic age | [[File:DryosaurusNV.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Dryptosaurus | 1877 | Navesink Formation?, New Egypt Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Jersey) | Its discovery showed that theropods were bipedal animals | [[File:Dryptosaurus aquilunguis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Dynamoterror | 2018 | Menefee Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Part of the Teratophoneini, a clade of tyrannosaurids exclusively known from southwestern North America | [[File:Dynamoterror right frontal in dorsal and ventral views.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Dyoplosaurus | 1924 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | The holotype specimen preserves skin impressions | [[File:Dyoplosaurus.tif | 200px]] | |||||||||||||||||||||||||||||||||||
| Dysganus | 1876 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Four species have been named, all from isolated teeth | |||||||||||||||||||||||||||||||||||||
| Dyslocosaurus | 1992 | Lance Formation?/Morrison Formation? (Late Jurassic, Kimmeridgian?/Late Cretaceous, Maastrichtian?) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Has been suggested to have four claws on its hindlimbs | [[File:Dyslocosaurus polyonychius.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Dystrophaeus | 1877 | Morrison Formation (Late Jurassic, Oxfordian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Inconsistent in phylogenetic placement, although undescribed remains could further clarify its relationships | [[File:Pube di Dystrophaeus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Edmontonia | 1928 | Dinosaur Park Formation, Horseshoe Canyon Formation, Judith River Formation? (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana?) | Possessed forward-pointing, bifurcated spikes on its shoulders | [[File:Edmontonia rugosidens.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Edmontosaurus | 1917 | Frenchman Formation, Hell Creek Formation, Horseshoe Canyon Formation, Lance Formation, Prince Creek Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Alaska | ||||||||||||||||||||||||||||||||||||||
| Colorado | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| North Dakota | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Known from multiple well-preserved specimens, including a few "mummies". Several were originally assigned to their own genera and/or species | [[File:Edmontosaurus sp. reconstruction.PNG | 200px]] | |||||||||||||||||||||||||||||||||||
| Einiosaurus | 1994 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Distinguished by its forward-curving nasal horn | [[File:Einiosaurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Enigmacursor | 2025 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | last1=Maidment | first1=S. C. R. | last2=Barrett | first2=P. M. | year=2025 | title=Enigmacursor mollyborthwickae, a neornithischian dinosaur from the Upper Jurassic Morrison Formation of the western USA | journal=Royal Society Open Science | volume=12 | issue=6 | at=242195 | doi=10.1098/rsos.242195 | doi-access=free | pmc=12188093 }} | [[File:Skeletal and life reconstruction of Enigmacursor.jpg | 200px]] | |||||||||||||||||||||||
| Eolambia | 1998 | Cedar Mountain Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Remains of multiple individuals are known, making up much of the skeleton | [[File:Eolambia cropped.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Eoneophron | 2024 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota) | Smaller than the contemporary Anzu | [[File:Eoneophron infernalis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Eotrachodon | 2016 | Mooreville Chalk (Late Cretaceous, Santonian) | United States | |||||||||||||||||||||||||||||||||||
| (Alabama) | Had a saurolophine-like skull despite its basal position | [[File:Eotrachodon NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Eotriceratops | 2007 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | May have been the largest known ceratopsid | [[File:Eotriceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Epichirostenotes | 2011 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Its discovery allowed researchers to connect isolated caenagnathid body parts to each other | [[File:Epichirostenotes.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Euoplocephalus | 1910 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Unusually, its palpebral bone was mobile, allowing it to be used as an eyelid | [[File:Euoplocephalus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Falcarius | 2005 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Transitional between generalized theropods and specialized therizinosaurs | [[File:Falcarius Restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Ferrisaurus | 2019 | Tango Creek Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (British Columbia) | Its holotype was discovered close to a railway line | [[File:Ferrisaurus life restoration.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Fona | 2024 | Cedar Mountain Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | last1=Avrahami | first1=Haviv M. | last2=Makovicky | first2=Peter J. | last3=Tucker | first3=Ryan T. | last4=Zanno | first4=Lindsay E. | date=2024-07-09 | title=A new semi-fossorial thescelosaurine dinosaur from the Cenomanian-age Mussentuchit Member of the Cedar Mountain Formation, Utah | journal=The Anatomical Record | language=en | doi=10.1002/ar.25505 | issn=1932-8486 | pmid=38979930 | doi-access=free}} | [[File:Fona herzogae.png | 200px]] | ||||||||||||||||||||
| Foraminacephale | 2016 | Dinosaur Park Formation, Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Originally assigned to three different pachycephalosaurid genera | [[File:Foraminacephale.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Fosterovenator | 2014 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Has been variously described as a ceratosaurid, a tetanuran or a close relative of Elaphrosaurus | [[File:Fosterovenator fíbula.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Fruitadens | 2010 | Morrison Formation (Late Jurassic, Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | One of the smallest known ornithischians | [[File:Fruitadens.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Furcatoceratops | 2023 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Preserves most of the postcranial skeleton, a rarity for ceratopsids. Remains originally identified as Avaceratops | [[File:Furcatoceratops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Galeamopus | 2015 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | One specimen is nearly complete, even preserving an associated skull | [[File:Galeamopus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Gargoyleosaurus | 1998 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Combines features of both ankylosaurids and nodosaurids | [[File:Gargoyle.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Gastonia | 1998 | Cedar Mountain Formation (Early Cretaceous, Valanginian to Barremian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Several concentrations of fossils may suggest this taxon lived in herds | [[File:Gastonia TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Geminiraptor | 2010 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | The proportions of its maxilla are similar to those of Late Cretaceous troodontids | [[File:Geminiraptor NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Glishades | 2010 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Described as a basal hadrosauroid but may in fact be a juvenile saurolophine hadrosaurid | |||||||||||||||||||||||||||||||||||||
| Glyptodontopelta | 2000 | Ojo Alamo Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Originally interpreted as possessing a flat mosaic of osteoderms similar to the shields of glyptodonts | [[File:Glyptodontopelta mima profile reconstruction.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Gojirasaurus | 1997 | Bull Canyon Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | May be a chimera consisting of undiagnostic theropod bones mixed with pseudosuchian vertebrae | [[File:Gojirasaurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Gorgosaurus | 1914 | Dinosaur Park Formation, Judith River Formation?, Two Medicine Formation? (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana?) | Dozens of specimens are known | [[File:Gorgosaurus 2022 Life Reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Gravitholus | 1979 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Potentially synonymous with Stegoceras | [[File:Gravitholus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Gremlin | 2023 | Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed a ridge running along the top of the skull | [[File:Gremlin TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Gryphoceratops | 2012 | Milk River Formation (Late Cretaceous, Santonian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Potentially the smallest adult ceratopsian known from North America | [[File:Gryphoceratops morrisoni.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Gryposaurus | 1914 | Bearpaw Formation?, Dinosaur Park Formation, Javelina Formation?, Kaiparowits Formation, Two Medicine Formation (Late Cretaceous, Santonian to Maastrichtian?) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Texas? | ||||||||||||||||||||||||||||||||||||||
| Utah) | One specimen preserves impressions of a row of pyramidal scales running along its back | [[File:Gryposaurus notabilis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Hadrosaurus | 1858 | Woodbury Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Jersey) | Its holotype was the first dinosaur skeleton to be mounted | [[File:Hadrosaurus foulkii restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Hagryphus | 2005 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Large but only known from a single hand | [[File:Hagryphus2.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hanssuesia | 2003 | Dinosaur Park Formation, Judith River Formation, Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | One dome preserves several lesions | [[File:Hanssuesia sternbergi.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Haplocanthosaurus | 1903 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Montana? | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | One of the smallest sauropods of the Morrison Formation | [[File:Haplocanthosaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hesperonychus | 2009 | Dinosaur Park Formation, Oldman Formation? (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | A common component of its habitat as indicated by the great number of its remains | [[File:Hesperonychus elizabethae pelvis by Nick Longrich.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hesperornithoides | 2019 | Morrison Formation (Late Jurassic, Oxfordian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Before its formal description, it had been nicknamed "Lori" | [[File:Hesperornithoides.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Hesperosaurus | 2001 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Two morphotypes of plates are known, which has been interpreted as an indication of sexual dimorphism | [[File:Hesperosaurus restoration.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hierosaurus | 1909 | Niobrara Formation (Late Cretaceous, Coniacian to Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Kansas) | Only known from a few bones, including osteoderms | [[File:Hierosaurus sternbergi.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hippodraco | 2010 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Its tooth crowns were shaped like shields | [[File:Hippodraco restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Hoplitosaurus | 1902 | Lakota Formation (Early Cretaceous, Barremian?) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota) | Known from some osteoderms, including spikes similar to those of Polacanthus | [[File:Hoplitosaurus marshi.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Huehuecanauhtlus | 2012 | Unnamed formation (Late Cretaceous, Santonian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Michoacán) | The southernmost non-hadrosaurid hadrosauroid known from North America | [[File:Huehuecanauhtlus tiquichensis copia.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hypacrosaurus | 1913 | Horseshoe Canyon Formation, Two Medicine Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Some juveniles of this genus were originally interpreted as dwarf lambeosaurines | [[File:Life reconstruction of Hypacrosaurus altispinus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Hypsibema | 1869 | Marshalltown Formation?, Ripley Formation, Tar Heel/Coachman Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Missouri | ||||||||||||||||||||||||||||||||||||||
| New Jersey? | ||||||||||||||||||||||||||||||||||||||
| North Carolina) | Potentially one of the largest non-hadrosaurid hadrosauroids | [[File:HypsibemaCrassicaudaVertNC.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Hypsirhophus | 1878 | Morrison Formation (Late Jurassic, Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Usually seen as synonymous with Stegosaurus but may be a separate genus due to differences in its vertebrae | [[File:Hypsirhophus discurus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Iani | 2023 | Cedar Mountain Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Represents the family Tenontosauridae, a clade of North American rhabdodontomorphs | [[File:Iani TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Iguanacolossus | 2010 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Large and robustly built | [[File:Life restoration of Iguanacolossus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Invictarx | 2018 | Menefee Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Only known from a few bones but can be distinguished from other genera by characters of its osteoderms | [[File:Invictarx zephyri, white background.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Issi | 2021 | Fleming Fjord Formation (Late Triassic, Norian) | Greenland | |||||||||||||||||||||||||||||||||||
| (Sermersooq) | Originally described as an exemplar of Plateosaurus | [[File:Issi saaneq.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Jeyawati | 2010 | Moreno Hill Formation (Late Cretaceous, Turonian to Coniacian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Its postorbital bone had a rugose texture | [[File:Jeyawati NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Judiceratops | 2013 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Unusually, its brow horns were teardrop-shaped in cross-section | [[File:Judiceratops tigris by Nick Longrich.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Kaatedocus | 2012 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | author1=John A. Whitlock | author2=Jeffrey A. Wilson Mantilla | year=2020 | title=The Late Jurassic sauropod dinosaur Morosaurus agilis Marsh, 1889 reexamined and reinterpreted as a dicraeosaurid | journal=Journal of Vertebrate Paleontology | volume=40 | issue=6 | article-number=e1780600 | doi=10.1080/02724634.2020.1780600 | bibcode=2020JVPal..40E0600W | doi-access=free }} | [[File:Kaatedocus skull.png | 200px]] | |||||||||||||||||||||||||
| Kayentavenator | 2010 | Kayenta Formation (Early Jurassic, Sinemurian to Pliensbachian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | Described in a book published through an online print-on-demand service | [[File:Kayentavenator.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Koparion | 1994 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Known from a single tooth which may have come from a troodontid | [[File:Koparion NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Kosmoceratops | 2010 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Possessed fifteen horns and horn-like structures, including eight hornlets folding down from the top of the frill | [[File:Kosmoceratops NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Kritosaurus | 1910 | El Picacho Formation?, Javelina Formation?, Kirtland Formation, Ojo Alamo Formation? (Late Cretaceous, Campanian to Maastrichtian?) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico | ||||||||||||||||||||||||||||||||||||||
| Texas?) | Had an elevated nasal bone with an enlarged nasal cavity to match | [[File:Kritosaurus navajovius.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Labocania | 1974 | Cerro del Pueblo Formation, La Bocana Roja Formation (Late Cretaceous, Cenomanian? to Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Baja California | ||||||||||||||||||||||||||||||||||||||
| Coahuila) | last1=Rivera-Sylva | first1=Héctor E. | last2=Longrich | first2=Nicholas R. | title=A New Tyrant Dinosaur from the Late Campanian of Mexico Reveals a Tribe of Southern Tyrannosaurs | year=2024 | journal=Fossil Studies | volume=2 | issue=4 | pages=245–272 | doi=10.3390/fossils2040012 | doi-access=free }} | [[File:Labocania color.jpg | 200px]] | ||||||||||||||||||||||||
| Lambeosaurus | 1923 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed a hollow head crest that varied in shape between species, sexes and ages. Most familiarly, it was hatchet-shaped in adult male L. lambei | [[File:Life reconstruction of Lambeosaurus lambei.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Laosaurus | 1878 | Morrison Formation (Late Jurassic, Oxfordian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Several referred specimens have been reassigned to other taxa | [[File:Laosaurus celer pubis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Latirhinus | 2012 | Cerro del Pueblo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | As described, it represented a chimera composed of lambeosaurine and saurolophine remains. The exact holotypic bones belonged to a lambeosaurine | [[File:Life reconstruction of Latirhinus uitstlani.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Lepidus | 2015 | Colorado City Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Muscle scars are preserved on the holotype bones | [[File:Lepidus praecisio.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Leptoceratops | 1914 | Hell Creek Formation, Lance Formation, Scollard Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Analysis of its teeth shows it could chew like a mammal, an adaptation to eating tough, fibrous plants | [[File:Leptoceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Leptorhynchos | 2013 | Aguja Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Had a slightly upturned mandible similar to those of oviraptorids | [[File:Leptorhynchos by Nick Longrich.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Lokiceratops | 2024 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | last1=Loewen | first1=Mark A. | last2=Sertich | first2=Joseph J. W. | last3=Sampson | first3=Scott | author-link3=Scott D. Sampson | last4=O'Connor | first4=Jingmai K. | author-link4=Jingmai O'Connor | last5=Carpenter | first5=Savhannah | last6=Sisson | first6=Brock | last7=Øhlenschlæger | first7=Anna | last8=Farke | first8=Andrew A. | last9=Makovicky | first9=Peter J. | last10=Longrich | first10=Nick | last11=Evans | first11=David C. | author-link11=David C. Evans (paleontologist) | date=20 June 2024 | title=Lokiceratops rangiformis gen. et sp. nov. (Ceratopsidae: Centrosaurinae) from the Campanian Judith River Formation of Montana reveals rapid regional radiations and extreme endemism within centrosaurine dinosaurs | journal=PeerJ | language=en | volume=12 | article-number=e17224 | doi=10.7717/peerj.17224 | issn=2167-8359 | doi-access=free | pmid=38912046 | pmc=11193970 }} | [[File:Lokiceratops rangiformis.png | 200px]] |
| Lophorhothon | 1960 | Mooreville Chalk, Tar Heel/Coachman Formation? (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Alabama | ||||||||||||||||||||||||||||||||||||||
| North Carolina?) | Although incomplete, the holotype skull preserves evidence of a crest | [[File:Lophorhothon atopus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Lythronax | 2013 | Wahweap Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Already had the forward-directed orbits of derived tyrannosaurids despite its early age | [[File:Lythronax TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Machairoceratops | 2016 | Wahweap Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Possessed two long, forward-pointing horns on the top of its frill | [[File:Machairoceratops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Magnapaulia | 2012 | El Gallo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Baja California) | Has been suggested to be semi-aquatic due to its tall, narrow tail | [[File:Magnapaulia laticaudus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Maiasaura | 1979 | Oldman Formation, Two Medicine Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Remains of hundreds of individuals, including juveniles, eggs and nests, have been found at a single site | [[File:Maiasaura BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Malefica | 2022 | Aguja Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Its discovery suggests a greater diversity of basal hadrosaurids than previously thought | [[File:Malefica TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Maraapunisaurus | 2018 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Named from a single, lost vertebra of immense size | [[File:Maraapunisaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Marshosaurus | 1976 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado? | ||||||||||||||||||||||||||||||||||||||
| Utah) | Potentially a close relative of Piatnitzkysaurus and Condorraptor | [[File:Marshosaurus restoration.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Martharaptor | 2012 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Had not yet acquired the robust feet of derived therizinosaurs | [[File:Martharaptor.tif | 200px]] | |||||||||||||||||||||||||||||||||||
| Medusaceratops | 2010 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Possessed elongated spikes curving away from the sides of its frill | [[File:Medusaceratops NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Menefeeceratops | 2021 | Menefee Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | One of the oldest centrosaurines | [[File:Menefeeceratops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Mercuriceratops | 2014 | Dinosaur Park Formation, Judith River Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Had "wing"-like projections on its squamosal bones | [[File:Mercuriceratops NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Mexidracon | 2025 | Cerro del Pueblo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | Had unusually long hands for an ornithomimosaur | [[File:Mexidracon longimanus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Microvenator | 1970 | Cloverly Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Teeth from Deinonychus have been mistakenly attributed to this genus | [[File:Microvenator.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Mierasaurus | 2017 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | last1=Royo-Torres | first1=R. | last2=Upchurch | first2=P. | last3=Kirkland | first3=J.I. | last4=DeBlieux | first4=D.D. | last5=Foster | first5=J.R. | last6=Cobos | first6=A. | last7=Alcalá | first7=L. | year=2017 | title=Descendants of the Jurassic turiasaurs from Iberia found refuge in the Early Cretaceous of western USA | journal=Scientific Reports | volume=7 | issue=1 | page=14311 | doi=10.1038/s41598-017-14677-2 | pmid=29085006 | pmc=5662694 | bibcode=2017NatSR...714311R }} | [[File:Mierasaurus Skull.png | 200px]] | ||||||||||||
| Moabosaurus | 2017 | Cedar Mountain Formation (Early Cretaceous, Aptian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Described as a macronarian but has since been reinterpreted as a turiasaur closely related to Mierasaurus | [[File:Moabosaurus utahensis restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Monoclonius | 1876 | Dinosaur Park Formation, Judith River Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Only known from indistinct remains of juveniles and subadults | [[File:Monoclonius 07539.JPG | 200px]] | |||||||||||||||||||||||||||||||||||
| Montanoceratops | 1951 | Horseshoe Canyon Formation?, St. Mary River Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Often restored with a short nasal horn although this may be a misplaced cheek horn | [[File:Montanoceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Moros | 2019 | Cedar Mountain Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | The proportions of its metatarsals are similar to those of ornithomimids | [[File:Moros intrepidus reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Mymoorapelta | 1994 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Utah) | The first ankylosaur described from the Morrison Formation | [[File:Mymoorapelta maysi.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Naashoibitosaurus | 1993 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Like other kritosaurins, it possessed a nasal arch, but it was not as tall as that of Gryposaurus | [[File:Naashoibitosaurus ostromi.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Nanosaurus | 1877 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Several referred specimens were originally assigned to other genera | [[File:Nanosaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Nanotyrannus | 1988 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Remains referred to this genus have been historically believed to be juvenile Tyrannosaurus specimens, but its validity was later affirmed in 2025 | [[File:Nanotyrannus lancensis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Nanuqsaurus | 2014 | Prince Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Alaska) | Described as a dwarf tyrannosaurid although undescribed remains suggest a size comparable to Albertosaurus | [[File:Nanuqsaurus hoglundi size chart.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Nasutoceratops | 2013 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Possessed an enlarged nasal cavity and two long, curving horns similar to those of modern cattle | [[File:Nasutoceratops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Navajoceratops | 2020 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | last1=Fowler | first1=D.W. | last2=Freedman Fowler | first2=E.A. | title=Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico | journal=PeerJ | date=2020 | volume=8 | article-number=e9251 | doi=10.7717/peerj.9251 | pmid=32547873 | pmc=7278894 | doi-access=free }} | [[File:Navajoceratops.png | 200px]] | |||||||||||||||||||||||
| Nedcolbertia | 1998 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Known from three partial skeletons. The specific name, justinhofmanni, honors a six-year-old schoolboy who won a contest to have a dinosaur named after him | [[File:Nedclobertia.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Nevadadromeus | 2022 | Willow Tank Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Nevada) | The first non-avian dinosaur described from Nevada | [[File:Nevadadromeus reconstruction.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Niobrarasaurus | 1995 | Niobrara Formation (Late Cretaceous, Coniacian to Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Kansas) | Originally mistakenly believed to have been aquatic | [[File:Niobrarasaurus femur.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Nodocephalosaurus | 1999 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Closely related to Asian ankylosaurids | |||||||||||||||||||||||||||||||||||||
| Nodosaurus | 1889 | Frontier Formation (Late Cretaceous, Cenomanian to Coniacian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Its armor included banded dermal plates interspersed by bony nodules | [[File:Nodosaurus 500 TWA.JPG | 200px]] | |||||||||||||||||||||||||||||||||||
| Nothronychus | 2001 | Moreno Hill Formation, Tropic Shale (Late Cretaceous, Turonian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico | ||||||||||||||||||||||||||||||||||||||
| Utah) | last1=Paul | first1=G. S. | title=The Princeton Field Guide to Dinosaurs | publisher=Princeton University Press | year=2016 | isbn=978-0-691-16766-4 | edition=2nd | location=Princeton, New Jersey}} along the Turonian shoreline | [[File:Nothronychus mckinleyi Restoration.png | 200px]] | ||||||||||||||||||||||||||||
| Ojoraptorsaurus | 2011 | Ojo Alamo Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Only known from an incomplete pair of pubes | [[File:Ojoraptorsaurus boerei profile reconstruction.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Oohkotokia | 2013 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Potentially a synonym of Scolosaurus | [[File:Oohkotokia.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ornatops | 2021 | Menefee Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Preserves a pair of bumps on its skull which may have anchored a crest | [[File:Ornatops incantatus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Ornitholestes | 1903 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | May have possessed a sickle claw similar to those of dromaeosaurids | [[File:Ornitholestes reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Ornithomimus | 1890 | Denver Formation, Dinosaur Park Formation, Ferris Formation?, Horseshoe Canyon Formation, Kaiparowits Formation? (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Utah? | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | One referred specimen preserves impressions of ostrich-like feathers covering most of its body | [[File:"Ornithomimus" sp. by Tom Parker.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Orodromeus | 1988 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Eggs considered to belong to this taxon may have actually come from a troodontid | [[File:Orodromeus (pencil 2013).png | 200px]] | |||||||||||||||||||||||||||||||||||
| Oryctodromeus | 2007 | Blackleaf Formation, Wayan Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Idaho | ||||||||||||||||||||||||||||||||||||||
| Montana) | Several specimens have been preserved in burrows | [[File:Oryctodromeus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Osmakasaurus | 2011 | Lakota Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota) | Originally named as a species of Camptosaurus | |||||||||||||||||||||||||||||||||||||
| Pachycephalosaurus | 1943 | Hell Creek Formation, Lance Formation, Scollard Formation? (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta?) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Possessed a tall, rounded head dome surrounded by bony knobs | [[File:Pachycephalosaurus Reconstruction.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Pachyrhinosaurus | 1950 | Horseshoe Canyon Formation, Prince Creek Formation, St. Mary River Formation, Wapiti Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Alaska) | Three species have been named, each with a unique pattern of cranial ornamentation | [[File:Pachyrhinosaurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Palaeoscincus | 1856 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Although many restorations depict it with the spikes of Edmontonia and the tail club of Ankylosaurus, this is most likely incorrect | [[File:Palaeoscincus costatus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Panoplosaurus | 1919 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Unlike other nodosaurids, it lacked enlarged spikes | [[File:Panoplosaurus 055.JPG | 200px]] | |||||||||||||||||||||||||||||||||||
| Parasaurolophus | 1922 | Dinosaur Park Formation, Fruitland Formation, Kaiparowits Formation, Kirtland Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (New Mexico | ||||||||||||||||||||||||||||||||||||||
| Utah) | Possessed a curved, hollow crest that varied in size between species | [[File:Parasaurolophus walkeri.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Paraxenisaurus | 2020 | Cerro del Pueblo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | Described as the first deinocheirid from North America | [[File:Paraxenisaurus normalensis as Deinocheirid.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Parksosaurus | 1937 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had long toes which may be an adaptation to walking on soft soils in watercourses and marshlands | [[File:Parksosaurus Steveoc86.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Paronychodon | 1876 | Hell Creek Formation, Judith River Formation, Lance Formation (Late Cretaceous, Campanian to Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| North Dakota | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Only known from highly distinctive teeth | [[File:Paronychodon.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Pawpawsaurus | 1996 | Paw Paw Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Had enlarged nasal cavities that gave it an acute sense of smell, even more powerful than that of contemporary theropods | [[File:Pawpawsaurus campbelli.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Pectinodon | 1982 | Hell Creek Formation, Lance Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | Had comb-like serrations on its teeth | [[File:Pectinodon TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Peloroplites | 2008 | Cedar Mountain Formation (Late Cretaceous, Cenomanian to Turonian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | One of the largest known nodosaurids | [[File:Peloroplites price 1.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Pentaceratops | 1923 | Fruitland Formation, Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Its epijugal bones, the hornlets under its eyes, were relatively large | [[File:Pentaceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Planicoxa | 2001 | Cedar Mountain Formation (Early Cretaceous, Barremian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | The rear of its ilium was characteristically flat | [[File:Planicoxa TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Platypelta | 2018 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Originally assigned to Euoplocephalus but was given its own genus because of several morphological differences | [[File:Platypelta AMNH 5337.tiff | 200px]] | |||||||||||||||||||||||||||||||||||
| Platytholus | 2023 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Differs from juveniles of the contemporary Pachycephalosaurus and Sphaerotholus, hence its classification as a new genus | [[File:Platytholus clemensi.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Podokesaurus | 1911 | Portland Formation (Early Jurassic, Hettangian to Sinemurian) | United States | |||||||||||||||||||||||||||||||||||
| (Massachusetts) | May have had a tail one and a half times longer than the rest of its skeleton | [[File:Podokesaurus restoration.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Polyodontosaurus | 1932 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | last1=van der Reest | first1=A.J. | last2=Currie | first2=P.J. | year=2017 | title=Troodontids (Theropoda) from the Dinosaur Park Formation, Alberta, with a description of a unique new taxon: implications for deinonychosaur diversity in North America | journal=Canadian Journal of Earth Sciences | volume=54 | issue=9 | pages=919–935 | doi=10.1139/cjes-2017-0031 | bibcode=2017CaJES..54..919V | hdl=1807/78296 | hdl-access=free}} | ||||||||||||||||||||||||
| Polyonax | 1874 | Denver Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Poorly known | |||||||||||||||||||||||||||||||||||||
| Prenoceratops | 2004 | Oldman Formation, Two Medicine Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | The only basal neoceratopsian known from a bonebed | [[File:Prenoceratops BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Priconodon | 1888 | Arundel Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Maryland) | Large but only known from teeth | [[File:Priconodon.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Probrachylophosaurus | 2015 | Foremost Formation, Judith River Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Shows a skull morphology transitional between crestless and crested brachylophosaurins | [[File:Probrachylophosaurus bergei.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Propanoplosaurus | 2011 | Patuxent Formation (Early Cretaceous, Aptian) | United States | |||||||||||||||||||||||||||||||||||
| (Maryland) | Only known from the imprints of a neonate skeleton | [[File:Propanoplosaurus restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Prosaurolophus | 1916 | Dinosaur Park Formation, Two Medicine Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana) | Had a relatively large head for a hadrosaur | [[File:Prosaurolophus Maximus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Protohadros | 1998 | Woodbine Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Possessed a downturned jaw which may be an adaptation to grazing on low-growing plants | |||||||||||||||||||||||||||||||||||||
| Pteropelyx | 1889 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Potentially synonymous with Corythosaurus, although this cannot be confirmed due to the lack of cranial remains | |||||||||||||||||||||||||||||||||||||
| Rativates | 2016 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Originally described as a specimen of Struthiomimus | [[File:Rativates.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Regaliceratops | 2015 | St. Mary River Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed a series of large, pentagonal plates lining its frill | [[File:Regaliceratops peterhewsi.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Richardoestesia | 1990 | Aguja Formation, Dinosaur Park Formation, Ferris Formation?, Hell Creek Formation?, Horseshoe Canyon Formation?, Lance Formation?, Scollard Formation? (Late Cretaceous, Campanian to Maastrichtian?) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana? | ||||||||||||||||||||||||||||||||||||||
| Texas | ||||||||||||||||||||||||||||||||||||||
| Wyoming?) | Teeth assigned to this genus have been recovered all around the world, in deposits spanning from the Jurassic to the Cretaceous, although they may not represent a single taxon | [[File:Ojo Alamo cf. Richardoestesia sp profile reconstruction.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Rugocaudia | 2012 | Cloverly Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Some of this genus' remains include several caudal vertebrae | [[File:Rugocaudia.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Sarahsaurus | 2011 | Kayenta Formation (Early Jurassic, Sinemurian to Pliensbachian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | Possessed strong hands which may indicate a feeding specialization | [[File:Sarahsaurus restoration.PNG | 200px]] | |||||||||||||||||||||||||||||||||||
| Saurolophus | 1912 | Horseshoe Canyon Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had a short, solid crest that pointed directly upwards. A larger, more well-known species has been found in Mongolia | [[File:Saurolophus scalation.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Sauropelta | 1970 | Cedar Mountain Formation?, Cloverly Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| Utah? | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Its tail had at least forty vertebrae, making up half of its total body length | [[File:Sauropelta jconway.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Saurophaganax | 1995 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico? | ||||||||||||||||||||||||||||||||||||||
| Oklahoma) | last1=Danison | first1=Andrew | last2=Wedel | first2=Mathew | last3=Barta | first3=Daniel | last4=Woodward | first4=Holly | last5=Flora | first5=Holley | last6=Lee | first6=Andrew | last7=Snively | first7=Eric | date=2024-12-21 | title=Chimerism in specimens referred to Saurophaganax maximus reveals a new species of Allosaurus (Dinosauria, Theropoda) | url=https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29404 | journal=Vertebrate Anatomy Morphology Palaeontology | language=en | volume=12 | doi=10.18435/vamp29404 | issn=2292-1389 | doi-access=free }} | [[File:Saurophaganax maximus (holotype, OMNH 112).png | 200px]] | |||||||||||||
| Sauroposeidon | 2000 | Antlers Formation, Cloverly Formation, Glen Rose Formation, Twin Mountains Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Texas | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Could raise its head up to 18 m in the air, the height of a six-story building | [[File:Sauroposeidon proteles.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Saurornitholestes | 1978 | Dinosaur Park Formation, Donoho Creek Formation, Kirtland Formation, Mooreville Chalk, Oldman Formation, Tar Heel/Coachman Formation, Two Medicine Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Alabama | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| New Mexico | ||||||||||||||||||||||||||||||||||||||
| South Carolina) | last1=Currie | first1=Philip J. | last2=Evans | first2=David C. | title=Cranial Anatomy of New Specimens of Saurornitholestes langstoni (Dinosauria, Theropoda, Dromaeosauridae) from the Dinosaur Park Formation (Campanian) of Alberta | journal=The Anatomical Record | volume=303 | issue=4 | pages=691–715 | doi=10.1002/ar.24241 | pmid=31497925 | year=2020 | s2cid=202002676 | doi-access=free }} | [[File:Saurornitholestes digging Burrows wahweap.jpg | 200px]] | ||||||||||||||||||||||
| Scolosaurus | 1928 | Dinosaur Park Formation, Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Once widely believed to be synonymous with other Campanian ankylosaurids | [[File:Scolosaurus SW.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Scutellosaurus | 1981 | Kayenta Formation (Early Jurassic, Sinemurian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | Had hundreds of osteoderms arranged in rows along its back and tail | [[File:Scutellosaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Segisaurus | 1936 | Navajo Sandstone (Early Jurassic, Pliensbachian to Toarcian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | Preserves evidence of a wishbone similar to that of modern birds | [[File:Segisaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Seitaad | 2010 | Navajo Sandstone (Early Jurassic, Pliensbachian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | The holotype may have died when a sand dune collapsed on it | [[File:Seitaad NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Siats | 2013 | Cedar Mountain Formation (Late Cretaceous, Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Large but inconsistent in phylogenetic placement | [[File:Siats reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Sierraceratops | 2022 | Hall Lake Formation (Late Cretaceous, Campanian to Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | May be part of a unique clade of chasmosaurine ceratopsids only known from southern Laramidia | [[File:Sierraceratops.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Silvisaurus | 1960 | Dakota Formation (Early Cretaceous to Late Cretaceous, Albian to Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Kansas) | Hypothesized to live in a forested habitat | [[File:Silvisaurus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Smitanosaurus | 2020 | Morrison Formation (Late Jurassic, Oxfordian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Only known from a partial skull and some vertebrae | [[File:Smitanosaurus agilis skull and neck.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Sonorasaurus | 1998 | Turney Ranch Formation (Early Cretaceous to Late Cretaceous, Albian to Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Arizona) | State dinosaur of Arizona | [[File:Sonorasaurus thompsoni.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Sphaerotholus | 2002 | Dinosaur Park Formation, Frenchman Formation, Hell Creek Formation, Horseshoe Canyon Formation, Kirtland Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana | ||||||||||||||||||||||||||||||||||||||
| New Mexico) | Five species have been named, all known from skull elements. Lived in a broad range | [[File:Sphaerotholus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Spiclypeus | 2016 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Has been described as "boldly audacious" | [[File:Spiclypeus NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Spinops | 2011 | Dinosaur Park Formation?/Oldman Formation? (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Described almost a century after its remains were collected | [[File:Spinops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Stegoceras | 1902 | Dinosaur Park Formation, Fruitland Formation?, Kirtland Formation?, Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (New Mexico?) | May have been an indiscriminate bulk-feeder due to the shape of its snout | [[File:Stegoceras validum.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Stegopelta | 1905 | Frontier Formation (Early Cretaceous to Late Cretaceous, Albian to Cenomanian) | United States | |||||||||||||||||||||||||||||||||||
| (Wyoming) | May have possessed a sacral shield similar to other nodosaurids | [[File:Stegopelta pelvic armor.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Stegosaurus | 1877 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Had a single alternating row of large, kite-shaped plates | [[File:Stegosaurus stenops Life Reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Stellasaurus | 2020 | Two Medicine Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Possessed an enlarged, thickened nasal horn | [[File:Stellasaurus UDL.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Stenonychosaurus | 1932 | Dinosaur Park Formation, Two Medicine Formation? (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana?) | last1=Varricchio | first1=D. J. | last2=Hogan | first2=J. D. | last3=Gardner | first3=J. D. | year=2025 | title=Troodontid specimens from the Cretaceous Two Medicine Formation of Montana (USA) and the validity of Troodon formosus | journal=Journal of Paleontology | pages=1–22 | doi=10.1017/jpa.2024.67 | doi-access=free }} | [[File:Life reconstruction of Stenonychosaurus.png | 200px]] | ||||||||||||||||||||||||
| Stephanosaurus | 1914 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Poorly known | [[File:Trachodon (Pteropelyx) marginatus humerus and skin.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Stokesosaurus | 1974 | Morrison Formation (Late Jurassic, Kimmeridgian? to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota? | ||||||||||||||||||||||||||||||||||||||
| Utah) | Only known from a few remains but they are enough to tell that it was a tyrannosauroid | [[File:Stokesosaurus by Tom Parker.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Struthiomimus | 1917 | Horseshoe Canyon Formation?, Lance Formation?, Oldman Formation (Late Cretaceous, Campanian to Maastrichtian?) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Wyoming?) | Known from many specimens, indicating it was a common animal | [[File:Struthiomimus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Styracosaurus | 1913 | Dinosaur Park Formation, Two Medicine Formation? (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Montana?) | Possessed several long horns jutting out from the top of its frill, the patterns of which could have varied between individuals | [[File:Styracosaurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Supersaurus | 1985 | Morrison Formation (Late Jurassic, Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Several remains were originally believed to represent their own genera | [[File:Supersaurus dinosaur.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Suskityrannus | 2019 | Moreno Hill Formation (Late Cretaceous, Turonian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Small yet already possessed several features of larger, more derived tyrannosaurids, including an arctometatarsus | [[File:Suskityrannus life reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Suuwassea | 2004 | Morrison Formation (Late Jurassic, Oxfordian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Shares features with both diplodocids and dicraeosaurids, but is most likely a member of the latter group | [[File:Suuwassea Skeletal.svg | 200px]] | |||||||||||||||||||||||||||||||||||
| Talos | 2011 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | The holotype specimen preserves a pathology on its sickle claw | [[File:Talos sampsoni.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Tanycolagreus | 2005 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Had a long, blunt snout | 200px | ||||||||||||||||||||||||||||||||||||
| Tatankacephalus | 2009 | Cloverly Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Retained premaxillary teeth in its upper jaws, a basal trait | |||||||||||||||||||||||||||||||||||||
| Tawa | 2009 | Chinle Formation (Late Triassic, Norian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Well-preserved but inconsistent in phylogenetic placement | [[File:Tawa hallae Martz.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Tenontosaurus | 1970 | Antlers Formation, Arundel Formation, Cedar Mountain Formation, Cloverly Formation, Paluxy Formation, Twin Mountains Formation, Wayan Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Idaho | ||||||||||||||||||||||||||||||||||||||
| Maryland | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| Oklahoma | ||||||||||||||||||||||||||||||||||||||
| Texas | ||||||||||||||||||||||||||||||||||||||
| Utah) | Remains of this genus are often found associated with skeletons of Deinonychus | [[File:Tenontosaurus BW.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Teratophoneus | 2011 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Its snout was shorter and deeper than those of other tyrannosaurids | [[File:Teratophoneus2 NT.jpg | 200x200px]] | |||||||||||||||||||||||||||||||||||
| Terminocavus | 2020 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Had a teardrop-shaped hole on the top of its frill which was almost closed off by a pair of epoccipitals | [[File:Terminocavus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Texacephale | 2010 | Aguja Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | last1=Wick | first1=Steven L. | last2=Lehman | first2=Thomas M. | date=2024-09-19 | title=A rare 'flat-headed' pachycephalosaur (Dinosauria: Pachycephalosauridae) from West Texas, USA, with morphometric and heterochronic considerations | journal=Geobios | volume=86 | pages=89–106 | doi=10.1016/j.geobios.2024.08.006 | issn=0016-6995}} | [[File:Texacephale langstoni skull dome by Nick Longrich.png | 200px]] | |||||||||||||||||||||||||
| Texasetes | 1995 | Paw Paw Formation (Early Cretaceous, Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas) | Potentially synonymous with Pawpawsaurus | [[File:NMNH-USNM337987 1.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Thanatotheristes | 2020 | Foremost Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | A close relative of Daspletosaurus | [[File:Thanatotheristes.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Theiophytalia | 2006 | Purgatoire Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Only known from a skull originally referred to Camptosaurus | [[File:Theiophytalia skull.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Thescelosaurus | 1913 | Frenchman Formation, Hell Creek Formation, Lance Formation, Laramie Formation, Scollard Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| North Dakota | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | One specimen was originally considered to have preserved its heart, although this was later found to be a mineral concretion | [[File:Thescelosaurus filamented.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Thespesius | 1856 | Lance Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (South Dakota) | Once suggested to be a possible Miocene mammal | [[File:Thespesius occidentalis.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Tichosteus | 1877 | Morrison Formation (Late Jurassic, Kimmeridgian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado) | Two species have been named, both from isolated vertebrae | [[File:Tichosteus lucasanus.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Titanoceratops | 2011 | Fruitland Formation?/Kirtland Formation? (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Potentially a large, old specimen of Pentaceratops | [[File:Titanoceratops ouranos life restoration.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Tlatolophus | 2021 | Cerro del Pueblo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | Possessed a short, broad crest resembling an inverted comma | [[File:Tlatolophus.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Torosaurus | 1891 | Frenchman Formation, Hell Creek Formation, Lance Formation, North Horn Formation?, Scollard Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Colorado? | ||||||||||||||||||||||||||||||||||||||
| Montana? | ||||||||||||||||||||||||||||||||||||||
| New Mexico? | ||||||||||||||||||||||||||||||||||||||
| North Dakota? | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Texas? | ||||||||||||||||||||||||||||||||||||||
| Utah? | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Once believed to be potentially synonymous with Triceratops | [[File:Torosaurus life restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Torvosaurus | 1979 | Morrison Formation (Late Jurassic, Kimmeridgian to Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | Had short but powerfully built arms. Several species, many of them unnamed, have been found in Europe, South America and possibly Africa | [[File:Torvosaurus tanneri Reconstruction.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Tototlmimus | 2016 | Packard Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Sonora) | The southernmost ornithomimid known from North America | |||||||||||||||||||||||||||||||||||||
| Trachodon | 1856 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Several remains assigned to this genus actually belong to other taxa, most notably Edmontosaurus | [[File:Trachodon mirabilis.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Triceratops | 1889 | Denver Formation, Evanston Formation, Hell Creek Formation, Lance Formation, Laramie Formation, Scollard Formation (Late Cretaceous, Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan?) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | A common ceratopsid with long brow horns and a short nasal horn | [[File:Triceratops by Tom Patker.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Trierarchuncus | 2020 | Hell Creek Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Known from remains of different sizes which depict how the claws of alvarezsaurids grew more hooked as they aged | [[File:Trierarchuncus prairiensis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Troodon | 1856 | Judith River Formation, Two Medicine Formation? (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Usually seen as a dubious, undiagnostic genus, but a later study recommends the formal designation of a neotype to preserve its validity based on new troodontid fossil material discovered in the Two Medicine Formation | [[File:Troodon (cropped).jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Tyrannosaurus | 1905 | Frenchman Formation, Hall Lake Formation, Hell Creek Formation, Lance Formation, North Horn Formation, Scollard Formation, Willow Creek Formation (Late Cretaceous, Campanian to Maastrichtian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta | ||||||||||||||||||||||||||||||||||||||
| Saskatchewan) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (Colorado | ||||||||||||||||||||||||||||||||||||||
| Montana | ||||||||||||||||||||||||||||||||||||||
| New Mexico | ||||||||||||||||||||||||||||||||||||||
| South Dakota | ||||||||||||||||||||||||||||||||||||||
| Utah | ||||||||||||||||||||||||||||||||||||||
| Wyoming) | The last, largest and most well-known tyrannosaurid | [[File:Tyrannosaurus-rex-Profile-steveoc86.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Unescoceratops | 2012 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had the roundest teeth of any known leptoceratopsid | |||||||||||||||||||||||||||||||||||||
| Utahceratops | 2010 | Kaiparowits Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Almost the entire skeleton is known, including the skull | [[File:Utahceratops TD.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Utahraptor | 1993 | Cedar Mountain Formation (Early Cretaceous, Berriasian to Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Very large and powerfully built | [[File:Utahraptor Restoration.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Uteodon | 2011 | Morrison Formation (Late Jurassic, Tithonian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | May be a species of Camptosaurus, with a referred braincase being from Dryosaurus | [[File:Uteodon reconstruction raingerr.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Utetitan | 2025 | Black Peaks Formation?, Javelina Formation?, North Horn Formation (Late Cretaceous, Maastrichtian) | United States | |||||||||||||||||||||||||||||||||||
| (Texas? | ||||||||||||||||||||||||||||||||||||||
| Utah) | Known from partial skeletons originally identified as possible northern specimens of Alamosaurus | [[File:Utetitan zellaguymondeweyae.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Vagaceratops | 2010 | Dinosaur Park Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed a row of fused epoccipitals folding over the top of the frill | [[File:Vagaceratops NT.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Velafrons | 2007 | Cerro del Pueblo Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | May have had elongated neural spines similar to those of Hypacrosaurus altispinus | [[File:Life reconstruction of Velafrons coahuilensis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Venenosaurus | 2001 | Cedar Mountain Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | Its skeleton has traits of both titanosaurs and more basal macronarians | |||||||||||||||||||||||||||||||||||||
| Wendiceratops | 2015 | Oldman Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Had three pairs of enlarged, curved epiparietals at the very top of its frill | [[File:Wendiceratops restoration.PNG | 200px]] | |||||||||||||||||||||||||||||||||||
| Xenoceratops | 2012 | Foremost Formation (Late Cretaceous, Campanian) | Canada | |||||||||||||||||||||||||||||||||||
| (Alberta) | Possessed two long spikes at the top of its frill with smaller knobs at their bases | [[File:Xenoceratops NT small.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Xenovenator | 2026 | Cerro del Pueblo Formation, Kirtland Formation? (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | ||||||||||||||||||||||||||||||||||||||
| United States | ||||||||||||||||||||||||||||||||||||||
| (New Mexico?) | Had an unusually thickened skull roof which suggests it may have engaged in intraspecific combat | [[File:Xenovenator espinosai.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Yehuecauhceratops | 2017 | Aguja Formation (Late Cretaceous, Campanian) | Mexico | |||||||||||||||||||||||||||||||||||
| (Coahuila) | One of the smallest known ceratopsids | [[File:Yehuecauhceratops.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Yurgovuchia | 2012 | Cedar Mountain Formation (Early Cretaceous, Valanginian) | United States | |||||||||||||||||||||||||||||||||||
| (Utah) | May have had a flexible tail due to the structure of its caudal vertebrae | [[File:Yurgovuchia.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Zapsalis | 1876 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Some teeth referred to this genus actually belong to Saurornitholestes | [[File:Zapsalis.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Zephyrosaurus | 1980 | Cloverly Formation (Early Cretaceous, Aptian to Albian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Currently only known from fragmentary remains but several undescribed specimens exist | [[File:Zephyrosaurus in Copenhagen.jpg | 200px]] | |||||||||||||||||||||||||||||||||||
| Ziapelta | 2014 | Kirtland Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Many specimens are known, most from the front part of the animal | [[File:Ziapelta.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Zuniceratops | 1998 | Moreno Hill Formation (Late Cretaceous, Turonian to Coniacian) | United States | |||||||||||||||||||||||||||||||||||
| (New Mexico) | Carried a pair of brow horns despite not being a member of the Ceratopsidae | [[File:Zuniceratops christopheri.png | 200px]] | |||||||||||||||||||||||||||||||||||
| Zuul | 2017 | Judith River Formation (Late Cretaceous, Campanian) | United States | |||||||||||||||||||||||||||||||||||
| (Montana) | Preserves several osteoderms, keratin and skin remains | [[File:Zuul.jpg | 200px]] |
Invalid and potentially valid genera
Agathaumas sylvestris.jpg|Agathaumas Alcovasaurus longispinus.png|Alcovasaurus Antrodemus.jpg|Antrodemus Capitalsaurus.jpg|"Capitalsaurus" Cathetosaurus skeleton 1.jpg|Cathetosaurus Coelosaurus antiquus tibia.jpg|"Coelosaurus" Deinodon.JPG|Deinodon Dracorex BW.jpg|Dracorex Drinker nisti (dinosaur) restoration.png|Drinker Epanterias amplexus.jpg|Epanterias Latenivenatrix.png|Latenivenatrix Mojoceratops NT.jpg|Mojoceratops Nedoceratops BW.jpg|Nedoceratops Ojoceratops NT.jpg|Ojoceratops Othnielia rex.jpg|Othnielia Othnielosaurus.jpg|Othnielosaurus Rhinorex condrupus.png|Rhinorex Rubeosaurus ovatus.jpg|Rubeosaurus Stygimoloch NT small.jpg|Stygimoloch Juvenile Tyrannosaurus (formerly Stygivenator).jpg|Stygivenator Tatankaceratops NT.jpg|Tatankaceratops
- Agathaumas sylvestris: Mostly well-known from a painting by Charles R. Knight. It may have been a synonym of Triceratops, but without cranial remains, this cannot be confirmed.
- Alcovasaurus longispinus: Although originally named as a species of Stegosaurus, it may actually be a species of the otherwise European Miragaia. However, a later study has considered Miragaia a junior synonym of Dacentrurus, making Alcovasaurus a potentially distinct genus.
- Antrodemus valens: May represent the same animal as Allosaurus. If so, the name Antrodemus would have priority. However, because it is based on undiagnostic remains of uncertain provenance, this cannot be confirmed.
- Apatodon mirus: Its holotype was originally believed to be the jawbone of a Mesozoic pig, but has been reinterpreted as a dinosaur vertebra. What type of dinosaur it belonged to is unknown, but there have been suggestions that it was from Allosaurus.
- "Beelemodon": Known only from two teeth found in Wyoming. They share features of compsognathids, dromaeosaurids and basal oviraptorosaurs.
- "Capitalsaurus": The official dinosaur of the District of Columbia. It is known from a single vertebra discovered at the intersection of First and F Streets S.E., which is now appropriately named "Capitalsaurus Court".
- Cathetosaurus lewisi: Usually seen as a species of Camarasaurus, but an unpublished study argues that it might be a distinct genus.
- Claorhynchus trihedrus: An indeterminate cerapod that may be either a hadrosaurid or a ceratopsid, in which case it may be a synonym of Triceratops.
- "Coelosaurus" antiquus: The generic name is said to be preoccupied, but its namesake remains obscure.
- "Comanchesaurus kuesi": Only named in a dissertation. It has been described as a possible indeterminate saurischian.
- Deinodon horridus: Only known from teeth. Several referred teeth have since been found to belong to already known species, and the holotype itself could belong to Gorgosaurus.
- Dracorex hogwartsia: Described as a small, flat-headed pachycephalosaur. However, it is likely that it is just a juvenile Pachycephalosaurus.
- Drinker nisti: May be a synonym of Nanosaurus, but a recent analysis suggests that some features of its teeth are also present in pachycephalosaurs. If this assignment is correct, it would make this taxon the only pachycephalosaur known from the Jurassic.
- Epanterias amplexus: Possibly a large specimen of Allosaurus, but it may be a different taxon due to its younger age.
- Latenivenatrix mcmasterae: The largest known troodontid. It is sometimes suggested to be synonymous with Stenonychosaurus, which its remains were originally assigned to.
- "Magulodon muirkirkensis": Only known from a single tooth that may belong to either an ornithopod or a basal ceratopsian.
- "Microcephale": Said to be an extremely small pachycephalosaur, with skull caps only 5 cm long.
- Mojoceratops perifania: May be a synonym of Chasmosaurus.
- Nedoceratops hatcheri: Due to its lack of a nasal horn, it has been named "Diceratops" (which is preoccupied by an insect) and Diceratus. However, it may simply be an unusual specimen of Triceratops.
- Ojoceratops fowleri: May be ancestral to Triceratops or a synonym of Eotriceratops.
- "Orcomimus": Potentially attributable to any of the ornithomimosaur taxa known from the Hell Creek Formation.
- Othnielia rex: Only known from an undiagnostic femur, but it may have belonged to Nanosaurus anyway.
- Othnielosaurus consors: Most likely a synonym of Nanosaurus.
- Palaeopteryx thomsoni: Known from a few very small bones which could belong to either a bird or a small bird-like dinosaur.
- Protoavis texensis: Described as a Triassic bird but is most likely a chimera consisting of elements from various unrelated tetrapods.
- Rhinorex condrupus: Phylogenetic analysis shows that it may fall within Gryposaurus, and thus be a junior synonym of that genus.
- Rubeosaurus ovatus: Likely a species of Styracosaurus, or even simply an unusual specimen of S. albertensis.
- Stygimoloch spinifer: Had a short skull dome with long horns jutting out from behind it. It is usually thought to be a subadult Pachycephalosaurus, but has been noted to be stratigraphically younger. Three attributed specimens recovered from the Ferris Formation, which is the taxon's southernmost occurrence, would make it distinct from the aforementioned genus.
- Stygivenator molnari: Uncertain whether it belongs to Tyrannosaurus or Nanotyrannus.
- Tatankaceratops sacrisonorum: Noted to possess a strange mix of features of both juvenile and adult Triceratops. It may be a dwarf specimen of that genus or an individual that stopped growing prematurely.
Timeline
This is a timeline of selected dinosaurs from the list above. Time is measured in Ma, megaannum, along the x-axis.
ImageSize = width:800px height:auto barincrement:15px PlotArea = left:10px bottom:50px top:10px right:10px
Period = from:-251.902 till:-25 TimeAxis = orientation:horizontal ScaleMajor = unit:year increment:25 start:-25 ScaleMinor = unit:year increment:5 start:-251.902 TimeAxis = orientation:hor AlignBars = justify
Colors =
- legends id:CAR value:claret id:HER value:teal id:OMN value:blue id:black value:black id:white value:white id:cretaceous value:rgb(0.3,0.75,0.1) id:jurassic value:rgb(0.3,0.75,0.4) id:triassic value:rgb(0.3,0.75,0.7) id:mesozoic value:rgb(0.3,0.6,0.4)
BarData= bar:eratop bar:space bar:periodtop bar:space bar:NAM1 bar:NAM2 bar:NAM3 bar:NAM4 bar:NAM5 bar:NAM6 bar:NAM7 bar:NAM8 bar:NAM9 bar:NAM10 bar:NAM11 bar:NAM12 bar:NAM13 bar:NAM14 bar:NAM15 bar:NAM16 bar:NAM17 bar:NAM18 bar:NAM19 bar:NAM20 bar:NAM21 bar:NAM22 bar:NAM23 bar:NAM24 bar:NAM25 bar:NAM26 bar:NAM27 bar:NAM28 bar:NAM29 bar:NAM30 bar:NAM31 bar:NAM32 bar:NAM33 bar:NAM34 bar:NAM35 bar:NAM36 bar:NAM37 bar:NAM38 bar:NAM39 bar:NAM40 bar:NAM41 bar:NAM42 bar:NAM43 bar:NAM44 bar:NAM45 bar:NAM46 bar:NAM47 bar:NAM48 bar:NAM49 bar:NAM50 bar:NAM51 bar:NAM52 bar:NAM53 bar:NAM54 bar:NAM55 bar:NAM56 bar:NAM57 bar:NAM58 bar:NAM59 bar:NAM60 bar:NAM61 bar:NAM62 bar:space bar:period bar:space bar:era
PlotData= align:center textcolor:black fontsize:M mark:(line,black) width:25 shift:(7,-4)
bar:periodtop from: -145 till: -66 color:cretaceous text:Cretaceous from: -201.3 till: -145 color:jurassic text:Jurassic from: -251.902 till: -201.3 color:triassic text:Triassic
bar:eratop from: -251.902 till: -66 color:mesozoic text:Mesozoic
PlotData= align:left fontsize:M mark:(line, white) width:5 anchor:till align:left
color:CAR bar:NAM1 from:-216 till:-196 text:Coelophysis color:CAR bar:NAM2 from:-199 till:-188 text:Megapnosaurus color:HER bar:NAM3 from:-197 till:-195 text:Scutellosaurus color:HER bar:NAM4 from:-160 till:-150 text:Camptosaurus color:HER bar:NAM5 from:-156.3 till:-146.8 text:Brontosaurus color:HER bar:NAM6 from:-155 till:-145 text:Camarasaurus color:HER bar:NAM7 from:-155 till:-145 text:Dryosaurus color:CAR bar:NAM8 from:-155 till:-145 text:Allosaurus color:HER bar:NAM9 from:-155 till:-150 text:Stegosaurus color:HER bar:NAM10 from:-155 till:-152 text:Haplocanthosaurus color:HER bar:NAM13 from:-153 till:-147 text:Diplodocus color:CAR bar:NAM11 from:-153 till:-148 text:Ceratosaurus color:CAR bar:NAM12 from:-153 till:-148 text:Torvosaurus color:HER bar:NAM14 from:-153 till:-150 text:Barosaurus color:HER bar:NAM15 from:-153 till:-150 text:Apatosaurus color:CAR bar:NAM16 from:-152 till:-148 text:Saurophaganax color:HER bar:NAM17 from:-150 till:-145 text:Brachiosaurus color:CAR bar:NAM18 from:-150 till:-145 text:Ornitholestes color:OMN bar:NAM19 from:-130 till:-125 text:Falcarius color:CAR bar:NAM20 from:-130 till:-125 text:Yurgovuchia color:CAR bar:NAM21 from:-128.5 till:-126 text:Utahraptor color:CAR bar:NAM22 from:-116 till:-110 text:Acrocanthosaurus color:CAR bar:NAM23 from:-115 till:-108 text:Deinonychus color:HER bar:NAM24 from:-115 till:-108 text:Tenontosaurus color:HER bar:NAM25 from:-112 till:-108 text:Sauroposeidon color:HER bar:NAM26 from:-93 till:-91 text:Zuniceratops color:HER bar:NAM27 from:-87 till:-82 text:Niobrarasaurus color:HER bar:NAM28 from:-83 till:-74 text:Gryposaurus color:HER bar:NAM29 from:-79 till:-77 text:Brachylophosaurus color:HER bar:NAM30 from:-77.5 till:-74 text:Stegoceras color:OMN bar:NAM31 from:-77.5 till:-75.5 text:Troodon color:CAR bar:NAM32 from:-77.1 till:-74.1 text:Gorgosaurus color:HER bar:NAM33 from:-77 till:-73 text:Centrosaurus color:HER bar:NAM34 from:-77 till:-73 text:Corythosaurus color:HER bar:NAM35 from:-77 till:-74 text:Lambeosaurus color:HER bar:NAM36 from:-77 till:-74 text:Monoclonius color:HER bar:NAM37 from:-77 till:-66 text:Edmontonia color:HER bar:NAM38 from:-76.5 till:-66.5 text:Ornithomimus color:HER bar:NAM39 from:-76.5 till:-73 text:Parasaurolophus color:HER bar:NAM40 from:-76.5 till:-74 text:Styracosaurus color:HER bar:NAM41 from:-75.79 till:-73 text:Pentaceratops color:OMN bar:NAM42 from:-75 till:-66 text:Struthiomimus color:HER bar:NAM43 from:-75 till:-67 text:Hypacrosaurus color:HER bar:NAM44 from:-75 till:-73 text:Brachyceratops color:HER bar:NAM45 from:-74.5 till:-72 text:Ziapelta color:HER bar:NAM46 from:-74 till:-66 text:Kritosaurus color:HER bar:NAM47 from:-73 till:-69 text:Edmontosaurus regalis color:HER bar:NAM48 from:-73 till:-71 text:Velafrons color:HER bar:NAM49 from:-73 till:-70 text:Anchiceratops color:CAR bar:NAM50 from:-71 till:-68 text:Albertosaurus color:HER bar:NAM51 from:-71 till:-69 text:Montanoceratops color:HER bar:NAM52 from:-70 till:-66 text:Alamosaurus color:HER bar:NAM53 from:-70 till:-66 text:Pachycephalosaurus color:HER bar:NAM54 from:-70 till:-68.5 text:Saurolophus color:HER bar:NAM55 from:-69 till:-66 text:Eotriceratops color:HER bar:NAM56 from:-68 till:-66 text:Torosaurus color:HER bar:NAM57 from:-68 till:-66 text:Triceratops color:HER bar:NAM58 from:-68 till:-66 text:Ankylosaurus color:CAR bar:NAM59 from:-68 till:-66 text:Tyrannosaurus color:HER bar:NAM60 from:-68 till:-66 text:Thescelosaurus color:HER bar:NAM61 from:-68 till:-66 text:Edmontosaurus annectens color:HER bar:NAM62 from:-68 till:-66 text:Leptoceratops PlotData= align:center textcolor:black fontsize:M mark:(line,black) width:25
bar:period from: -145 till: -66 color:cretaceous text:Cretaceous from: -201.3 till: -145 color:jurassic text:Jurassic from: -251.902 till: -201.3 color:triassic text:Triassic
bar:era from: -251.902 till: -66 color:mesozoic text:Mesozoic
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