Synonym: Protherosauria Osborn 1902 [replaced name]
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 A. Meyer and R. Zardoya 2003
See also Benton 1985, Carroll 1988, Currie 1977, Daly 1973, Gauthier et al. 1989, Gauthier et al. 1988, Haubold 1971, Haubold 1974, Haughton and Brink 1954, Kuhn 1966, Langston and Reisz 1981, Laurin and Reisz 1995, Lewis and Vaughn 1965, McKenna and Bell 1997, Olson 1947, Olson 1962, Olson 1966, Olson 1974, Olson and Beerbower 1953, Osborn 1903, Osborn 1903, Osborn 1904, Roxo 1937, Waldman and Savage 1972 and Williston 1917
Sister taxa: Colognathus, Dicondylia, Enigmatopus, Euamniota, Gnorhimosuchus, Kraterokheirodon, Mesosauria, Monocondylia, Plagiaulax dawsoni, Recumbirostra, Sauropsida, Timanosaurus, Vitalia
Subtaxa: Asaphestera Caseasauria Chelichnopodidae Eupelycosauria Ophiacomorpha Pelycosauria
Ecology: