Mammalia - Artiodactyla - Merycoidodontidae
Full reference: G. G. Simpson. 1945. The principles of classification and a classification of mammals. Bulletin of the American Museum of Natural History 85:1-350
Parent taxon: Merycoidodontidae according to M. S. Stevens et al. 2023
See also Parris and Grandstaff 2003, Schultz and Falkenbach 1947, Simpson 1945, Stevens and Stevens 1996 and Stevens and Stevens 2007
Sister taxa: Aclistomycterinae, Brachycrurinae, Eporeodontinae, Leptaucheniinae, Merychyus pariogonus, Merycochoerinae, Merycoidodontinae, Miniochoerinae, Oreonetinae, Phenacocoelinae, Promerycochoerinae, Ticholeptinae, Ustatochoerinae, Diplotremus
Subtaxa: Merychyus Oreodontoides Paramerychyus
Ecology: ground dwelling herbivore
Distribution:
• Miocene of Canada (1: Saskatchewan collection), Mexico (2), United States (111: California, Colorado, Idaho, Kansas, Louisiana, Montana, Nebraska, Nevada, New Mexico, Oklahoma, Oregon, South Dakota, Texas, Wyoming)
• Harrisonian of United States (46: California, Montana, Nebraska, South Dakota, Texas, Wyoming)
• Arikareean of United States (21: Arizona, California, North Dakota, Oregon, South Dakota, Texas, Wyoming)
• Oligocene of United States (6: Oregon, South Dakota)
• Eocene to Oligocene of Mexico (1)
Total: 188 collections including 204 occurrences