†suborder Colymbiformes (avialan)
Parent taxon: Carinatae according to O. P. Hay 1930
See also Gadow 1898, Jaekel 1911, Miller and Bowman 1958 and Wetmore 1956
Sister taxa: Anatiformes, Crateropteryx, Diatrymatiformes, Galliformes, Odontotormae, Tubinares
Subtaxa: Colymbidae
Ecology: ground dwelling carnivore
Distribution:
• Quaternary of Monaco (1 collection), United States (1: California)
• Pliocene to Pleistocene of Italy (1), United States (1: California)
• Pliocene of United States (2: California, Idaho)
• Neogene of United States (1: Arizona)
• Oligocene of United States (1: Oregon)
Total: 8 collections including 9 occurrences