Parent taxon: Cetartiodactyla according to J.-R. Boisserie et al. 2005
See also Carroll 1988, Colbert 1938, Foss 2007 and Vislobokova 2008
Sister taxa: Achaenodontidae, Ancodonta, Antiacodontidae, Antiacodontinae, Booidea, Bunomerycidae, Cainotherioidea, Choeropotamoidea, Climacoceratidae, Diacodexeidae, Dichobunoidea, Eolantianus, Erlianhyus, Eurytheriidae, Haplobunodontidae, Hsanotherium, Hyodonta, Leptochoerinae, Merycoidodontoidea, Myanmarius, Neoselenodontia, Nonruminantia, Omnivora, Raphenacodus, Ruminantiamorpha, Suiformes, Suoidea, Tapirulidae, Tragulohyus, Trigonolestidae, Tylopoda, Whippomorpha, Cetruminantia
Subtaxa: Entelodontidae
Ecology: ground dwelling grazer-browser
Distribution:
• Miocene of Canada (2: Saskatchewan collections), United States (8: California, New Jersey, Oregon, South Dakota, Texas, Wyoming)
• Harrisonian of United States (7: Florida, Nebraska, Wyoming)
• Arikareean of United States (11: Mississippi, Montana, Nebraska, Oregon, South Dakota, Wyoming)
• Oligocene to Miocene of China (1), United States (1: Alabama)
• Oligocene of Canada (2: Saskatchewan), China (3), Czechia (1), France (6), Georgia (1), Germany (2), Kazakhstan (1), Pakistan (1), United States (40: California, Colorado, Nebraska, North Carolina, North Dakota, Oregon, South Carolina, South Dakota, Texas, Wyoming)
• Eocene of Canada (6: Saskatchewan), China (11), Japan (1), Mongolia (4), Thailand (2), United States (30: Colorado, Georgia, Nebraska, New Mexico, Oregon, South Dakota, Texas, Utah, Wyoming)
Total: 141 collections including 159 occurrences