Synonyms: Champsosauri Jaekel 1910, Champsosauria Jaekel 1910, Simoedosauria Dollo
Full reference: E. D. Cope. 1876. On some extinct reptiles and Batrachia from the Judith River and Fox Hills Beds of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 28:340-359
Parent taxon: Sauria according to M. D. Ezcurra 2016
See also Carroll 1988, Cvancara and Hoganson 1993, Dong et al. 2020, Estes 1964, Evans 1990, Evans and Klembara 2005, Evans and Manabe 1999, Gao et al. 2000, Gao and Fox 1998, Gao and Fox 2005, Gauthier et al. 1989, Hay 1930, Hecht 1992, Hou et al. 2010, Jaekel 1910, Jaekel 1911, Kuhn 1946, Kuhn 1966, Osborn 1903, Osborn 1904, Peng et al. 2001, Reiss et al. 2019, Roxo 1937 and Russell 1956
Sister taxa: Antarcticoolithus, Lepidosauromorpha
Subtaxa: Coeruleodraco Cteniogenyidae Heishanosaurus Hyphalosauridae Hyphalosaurus Irenosaurus Khurendukhosaurus Lazarussuchus Monjurosuchidae Monjurosuchus Neochoristodera Novapes Pachystropheus Philydrosaurus Shokawa