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Trinacromerum

Extinct genus of reptiles

Trinacromerum
Summary

Extinct genus of reptiles

  • T. bentonianum Cragin, 1888 (type)
  • T. kirki Russell, 1935

Trinacromerum is an extinct genus of sauropterygian reptile, a member of the polycotylid plesiosaurs. It contains two species, T. bentonianum and T. kirki. Specimens have been discovered in the Late Cretaceous fossil deposits of what is now modern Kansas and Manitoba. Some fossils are also found in the Southern United States such as in the Mooreville Chalk of Alabama.

Description

''Trinacromerum'' with a human to scale

Trinacromerum was 3 m long. Its teeth show that it fed on small fish.

The long flippers of Trinacromerum enabled it to achieve high swimming speeds.{{cite book

Classification

''T. bentonianum'' [[life restoration

Below is a cladogram of polycotylid relationships from Ketchum & Benson, 2011.

References

References

  1. Kiernan, Caitlin R.. (2002-03-14). "Stratigraphic distribution and habitat segregation of mosasaurs in the Upper Cretaceous of western and central Alabama, with an historical review of alabama mosasaur discoveries". Journal of Vertebrate Paleontology.
  2. Ellis, 190
  3. (2011). "A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids". Special Papers in Palaeontology.
Wikipedia Source

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late-cretaceous-plesiosaurs-of-north-america polycotylidae sauropterygian-genera fossil-taxa-described-in-1888
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