Seymouriidae

Diadectomorpha

Caseidae

Ophiacodontidae

Edaphosauridae

Sphenacodontidae

Cynodontia

Gorgonopsia

Younginiformes

Claudiosaurus

Araeoscelidia

Macroleter

Millerettidae

Paleothyris

Captorhinidae

Owenetta

Procolophon

Lanthanosuchidae

Acleistorhinus

Kuehneosauridae

Squamata

Rhynchocephalia

Bradysaurus

Anthodon

Scutosaurus

Eosauropterygia

Sinosaurosphargis

Cyamodus

Placodus

Eunotosaurus

Odontochelys

Testudines

Proganochelys

Choristodera

Prolacertiformes

Archosauriformes

Trilophosaurus

Rhynchosauria