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Paratypothorax

Genus of reptiles

P. andressorum Long and Ballew, 1985 emend. Heckert and Lucas, 2000 (type)

Paratypothorax is an extinct genus of aetosaur, known from a single species, Paratypothorax andressorum. It was a broadly distributed member of the group found in Germany, North America, and possibly parts of Gondwana. The best specimens come from Germany, though for more than a century they were mistakenly considered phytosaur armor. Paratypothorax was a large and wide-bodied typothoracine aetosaur, as well as the namesake of the tribe Paratypothoracisini.

Discovery and distribution

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In 1992, Paratypothorax fossils were first identified in the Chinle Group of the southwestern United States. It has been found in the Sonsela Member of Petrified Forest National Park in Arizona, as well as the Bluewater Creek Formation of western New Mexico. It is also common in strata of the Dockum Group further in eastern New Mexico and Texas. Osteoderms of Paratypothorax have also been reported from the Norian-age Fleming Fjord Formation in Greenland, the Zarzaitine Series of Algeria, and an unverified occurrence in India.

Description

''Paratypothorax'' specimen SMNS 19003, an articulated skull with dorsal armor

Paratypothorax possesses paramedian scutes that are wide, strap-like, and have grooves and pits on them forming radial patterns. Like other typothoracisines such as Typothorax, the lateral scutes bear large horns that are posteriorly hooked. The rear of each scute is overlapped by a prominent knob.

References

Schoch, Rainer R.. (2016). "Cranial anatomy of the aetosaur Paratypothorax andressorum Long & Ballew, 1985, from the Upper Triassic of Germany and its bearing on aetosaur phylogeny". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen.
Parrish, J. M.. (1994). "Cranial osteology of ''Longosuchus meadei'' and the phylogeny and distribution of the Aetosauria". Journal of Vertebrate Paleontology.
Long, R. A.. (1985). "Aetosaur dermal armor from the Late Triassic of southwestern North America, with special reference to material from the Chinle Formation of Petrified Forest National Park". Museum of Northern Arizona Bulletin.
Hunt, A. P.. (1992). "The first occurrence of the aetosaur ''Paratypothorax andressi'' (Reptilia:Aetosauria) in the western United States and its biochronological significance". Paläontologische Zeitschrift.
Jenkins, F. A. Jr.. (1994). "Late Triassic continental vertebrates and depositional environments of the Fleming Fjord Formation, Jameson Land, East Greenland". Meddelelser om Grønland, Geoscience.
Lucas, Spencer G.. (2006). "The Late Triassic aetosaur ''Paratypothorax''". New Mexico Museum of Natural History and Science Bulletin.
Murry, P. A.. (1986). "The Beginning of the Age of Dinosaurs". Cambridge University Press.
Heckert, A. B.. (1999). "A new aetosaur (Reptilia: Archosauria) from the Upper Triassic of Texas and the phylogeny of aetosaurs". Journal of Vertebrate Paleontology.

Info: Wikipedia Source

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aetosaurs-of-north-america late-triassic-reptiles-of-europe chinle-fauna late-triassic-pseudosuchians fossil-taxa-described-in-1985 prehistoric-pseudosuchian-genera

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