Seymouria

Diadectidae

Limnoscelidae

Synapsida

Mesosauridae

Captorhinidae

Araeoscelidia

Paleothyris

Younginiformes

Acleistorhinus

Millerettidae

Owenetta_kitchingorum

Procolophon_trigoniceps

Pareiasauria

Chelonii

Proganochelys

Odontochelys