Reptilia - Diapsida

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: Romeriida according to J. Müller and R. R. Reisz 2006

Sister taxon: Paleothyris

Subtaxa: Adelosaurus, Araeoscelidia, Archosauromorpha, Claraziidae, Diaptosauria, Endennasauridae, Eosuchia, Fremouwsauridae, Hupehsuchia, Lanthanolania, Mesenosauridae, Pleurosauridae, Rhynchocephalia, Sauropterygia, Tamaulipasaurus

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Ecology: