Fossil range: Middle Permian - Recent
Trilophosaurus, a primitive archosauromorph
Trilophosaurus, a primitive archosauromorph
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Subclass: Diapsida
Infraclass: Archosauromorpha
von Huene, 1946

See text

Archosauromorpha (Greek for "ruling lizard forms") is an Infraclass of diapsid reptiles that first appeared during the late Permian and became more common during the Triassic. Included in this infraclass are the orders Rhynchosauria, Trilophosauridae, Prolacertiformes, Archosauriformes, and, tentatively, the Choristodera. While superficially these reptiles vary in appearance (at one time they were even included in different subclasses-- the Trilophosaurs were considered Euryapsids, and the Rhynchosaurs were considered lepidosaurs and were included in the same order as the tuatara), they are actually united by a number of small skeletal and skull-related details that suggest they form a clade that descended from a single common ancestor.

Of the five taxa mentioned above, the first three died out at or prior to the end Triassic extinction. The Choristoderans continued as a minor group until the Miocene, and the Archosauriformes were important factors in early Triassic environments before giving rise to the even more successful Archosauria.





 |   `--+-?Teraterpeton
 |      `--Trilophosauria
                                 |--Crurotarsi (crocodiles and relatives)
                                 `--Ornithodira (dinosaurs, pterosaurs, and birds)

External links

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