Seymouria
Diadectidae
Limnoscelidae
Synapsida
Mesosauridae
Captorhinidae
Araeoscelidia
Paleothyris
Younginiformes
Acleistorhinus
Millerettidae
Owenetta_kitchingorum
Procolophon_trigoniceps
Pareiasauria
Odontochelys
Chelonii
Proganochelys