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Trilophosauria

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Trilophosauria
Fossil range: Triassic
Trilophosaurus BW
Trilophosaurus
Trilophosaurus Buettneri
Skeleton of Trilophosaurus buettneri.
Scientific classification

Class

Sauropsida

Subclass

Diapsida

Infraclass

Archosauromorpha

Order

Trilophosauria
Romer, 1956

Family

Trilophosauridae
Gregory, 1945

Genera



Trilophosaurs were lizard-like Triassic diapsid reptiles related to the archosaurs. The best known genus is Trilophosaurus, a herbivore up to 2.5 meters long. It had a short, unusually heavily-built skull, equipped with massive, broad flattened cheek teeth with sharp shearing surfaces for cutting up tough plant material. Teeth are absent from the premaxilla and front of the lower jaw, which in life were probably equipped with a horny beak. The skull is also unusual in that the lower temporal opening is missing, giving the appearance of a euryapsid skull, and originally the Trilophosaurs were classified with placodonts and sauropterygia. Carroll 1988 suggests that the lower opening may have been lost to strengthen the skull.

Trilophosaurs are so far known only from the Late Triassic of North America and Europe.

References Edit

External links Edit


Archosauromorphs
Primitive ArchosauromorphsEuparkeriidae • Erythrosuchidae • Proterochampsidae • Proterosuchidae • Choristodera • Prolacertiformes • Rhynchosauria • Trilophosauria

Crurotarsi ArchosaursOrnithosuchidae • Aetosauria • Phytosauria • Rauisuchia • Crocodylomorpha • Crocodilia

Avemetatarsalia and Ornithodira ArchosaursScleromochlus • Pterosauria • Dinosauromorpha • Dinosauria • Ornithischia • Saurischia • Aves

Avian ArchosaursAvialae • Archaeopteryx • Confuciusornis • Ichthyornis • Enantiornithes • Hesperornithes • Neornithes • Paleognathae • Neognathae

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