Full reference: A. S. Romer. 1956. Osteology of the Reptiles, University of Chicago Press 1-772
Parent taxon: Parareptilia according to R. J. Butler et al. 2023
See also Carroll 1988, Cisneros 2008, Cisneros et al. 2004, Daly 1973, Hamley et al. 2020, Haubold 1971, Lavina 1983, Lee 1995, Lee 1997, Modesto and Damiani 2007, Reisz and Scott 2002, Romer 1956 and Spencer and Benton 2000
Sister taxa: Bolosauria, Cheloniamorpha, Eunotosaurus, Kinelia, Microleter, Millerettidae, Nyctiphruretidae, Procolophonomorpha
Subtaxa: Owenettidae Pintosaurus Procolophonichnium Procolophonidae Tichvinskia jugensis
Distribution:
• Triassic of Antarctica (4 collections), Australia (2), Brazil (8), Canada (7: Nova Scotia), China (7), France (1), Germany (6), Italy (1), Madagascar (3), Morocco (3), the Netherlands (1), Poland (3), the Russian Federation (26), South Africa (22), Spain (2), Switzerland (1), Tanzania (1), the United Kingdom (9), United States (15: Arizona, Connecticut, New Jersey, New Mexico, Texas, Utah, Virginia), Uruguay (1)
• Permian to Triassic of South Africa (1)
• Permian of Brazil (1), Italy (1), Madagascar (1), the Russian Federation (1), South Africa (8)
Total: 136 collections including 174 occurrences