Synonym: Champsosauriformes Hay 1930 [replaced name]
Parent taxon: Choristodera according to R. Matsumoto et al. 2019
See also Gao and Fox 2005, Gao and Li 2007, Hay 1930, Matsumoto et al. 2013 and Matsumoto et al. 2007
Sister taxa: Coeruleodraco, Cteniogenyidae, Heishanosaurus, Hyphalosauridae, Hyphalosaurus, Irenosaurus, Khurendukhosaurus, Lazarussuchus, Monjurosuchidae, Monjurosuchus, Novapes, Pachystropheus, Philydrosaurus, Shokawa
Subtaxa: Champsosauridae Champsosaurus Ikechosaurus Simoedosauridae Tchoiria
Ecology:
Distribution:
• Eocene of Belgium (2 collections), Kazakhstan (1)
• Cf2 of United States (1: Wyoming)
• Cf3 of United States (2: Wyoming)
• Clarkforkian of United States (4: Montana, Wyoming)
• Paleocene of Canada (7: Alberta, Saskatchewan), France (2), Kazakhstan (1), United States (30: Colorado, Montana, North Dakota, Texas, Utah, Wyoming)
• Cretaceous of Austria (1), Canada (101: Alberta, Nunavut, Saskatchewan), China (9), Japan (1), Mongolia (5), the Russian Federation (3), United States (105: Colorado, Montana, New Jersey, North Dakota, South Dakota, Utah, Wyoming)
Total: 275 collections including 286 occurrences