Seymouriidae
Synapsida
Parareptilia
Captorhinidae
Araeoscelidia
Apsisaurus
Younginiformes
Claudiosaurus
Coelurosauravus
Saurosternon
Palaeagama
Drepanosauridae
Kuehneosauridae
Hupehsuchus
Ichthyopterygia
Askeptosaurus
Thalattosaurus
Clarazia
Tanystropheus
Macrocnemus
Prolacerta
Archosauriformes
Rhynchosauria
Trilophosaurus
Choristodera
Testudines
Squamata
Rhynchocephalia
Helveticosaurus
Placodus
Pachypleurosaurs
Pistosauridae
Simosaurus