Full reference: D. M. S. Watson. 1919. The structure, evolution and origin of the Amphibia.—The "orders" Rachitomi and Stereospondyli. Philosophical Transactions of the Royal Society of London, Series B 209:1-73
Parent taxon: Trematosauria according to R. R. Schoch 2013
See also Carroll 1988, Fortuny et al. 2017, Kuhn 1971, Schoch 2008, Schoch 2011, Schoch and Milner 2000, Welles 1993 and Yates and Warren 2000
Sister taxa: Laidleria, Metoposauroidea
Subtaxa: Almasauridae Calamops Callistomordax Gonioglyptus huxleyi Indolyrocephalus Indolyrocephalus panchetensis Lyrocephaliscidae Metoposauridae Peltostega Platystegidae Thoosuchus Trematosauridae Wetlugasauridae
Type: Trematosaurus
Ecology: amphibious carnivore
Distribution:
• Cretaceous of China (1 collection)
• Triassic of Algeria (1), Australia (5), Austria (1), Canada (1: Nova Scotia), France (1), Germany (21), Greenland (2), India (13), Italy (1), Jordan (1), Madagascar (7), Morocco (6), Pakistan (1), Poland (2), Portugal (2), the Russian Federation (36), South Africa (7), Svalbard and Jan Mayen (12), the United Kingdom (1), United States (173: Arizona, New Jersey, New Mexico, North Carolina, Oklahoma, Pennsylvania, Texas, Utah, Wyoming), Zimbabwe (1)
• Permian of Germany (1)
Total: 297 collections including 362 occurrences