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
See also Benton 1985, Carroll 1988, Chen et al. 2014, Chen et al. 2015, Cvancara and Hoganson 1993, Gao and Fox 1998, Gauthier et al. 1989, Gauthier et al. 1988, Hecht 1992, Jiang et al. 2006, Klein et al. 2020, Kuhn 1966, Laurin and Reisz 1995, Müller 2005, Nicholls 1999, Olson 1947, Olson 1966, Osborn 1903, Osborn 1903, Osborn 1904, Renesto 2005, Rieppel 1989, Rieppel 1989, Roxo 1937, Williston 1917 and Wintrich et al. 2017
Sister taxa: none
Subtaxa: Adelosaurus Araeoscelidia Archelosauria Archosauromorpha Diaptosauria Dolerosaurus Drepanosauromorpha Endennasauridae Eosuchia Fremouwsauridae Horaffia Hupehsuchia Ichthyosauromorpha Lanthanolania Palacrodon Prodiapsida Rysosteus Sauropterygia Saurosphargidae Stauromatodon Thalattosauriformes Utahdactylus Utahdactylus kateae