Triassic geology of Virginia

Doswellia is an extinct genus of archosauriform reptile from the Late Triassic of North America. It is the namesake of the family Doswelliidae, related to the proterochampsids which were more common in South America. Doswellia was a low and heavily built carnivore which lived during the Late Triassic. It possesses many unusual features, including a wide, flattened head with narrow jaws and a box-like rib cage covered by at least ten rows of bony plates.

left|thumb|198x198px|A "type A" Tanytrachelos, believed to be a female.

Uatchitodon is an extinct genus of Late Triassic reptile known only from isolated teeth. Based on the structure of the teeth, Uatchitodon was probably a carnivorous archosauromorph. Folded grooves on the teeth indicate that the animal was likely venomous, with the grooves being channels for salivary venom. The teeth are similar to those of living venomous squamates such as Heloderma and venomous snakes. Uatchitodon and Microzemiotes are the earliest known potentially venomous reptiles.