Seymouriadae
Diadectomorpha
Caseidae
Ophiacodontidae
Edaphosauridae
Sphenacodontidae
Cynodontia
Gorganopsia
Millerettidae
Lanthanosuchidae
Acleistorhinus
Macroleter
Owenetta
Procolophon
Bradysaurus
Anthodon
Scutosaurus
Captorhinidae
Paleothyris
Araeoscelidia
Claudiosaurus
Younginiformes
Choristodera
Archisauriformes
Prolacertiformes
Trilophosaurus
Rhynchosauria
Kuehneosauridae
Squamata
Rhynchocephalia
Testudines
Eosauropterygia
Cyamodus
Placodus