Amniota

Full reference: H. F. Osborn. 1903. On the primary division of the Reptilia into two sub-classes, Synapsida and Diapsida. Science 17(424):275-276

Parent taxon: Amniota according to M. Laurin and R. R. Reisz 1995

Sister taxa: Cincosaurus, Coelodontognathus, Dicondylia, Kraterokheirodon, Mesosauria, Monocondylia, Notalacerta, Sauropsida, Vitalia

Subtaxa: Brasilichnium, Eupelycosauria, Pelycosauria, Therapsida

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Ecology: