Mammalia - Artiodactyla - Merycoidodontidae
Full reference: O. P. Hay. 1902. Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868
Parent taxon: Merycoidodontidae according to M. S. Stevens and J. B. Stevens 2007
See also Hay 1902, Schultz and Falkenbach 1968 and Stevens and Stevens 1996
Sister taxa: Aclistomycterinae, Brachycrurinae, Eporeodontinae, Leptaucheniinae, Merychyinae, Merychyus pariogonus, Merycochoerinae, Miniochoerinae, Oreonetinae, Phenacocoelinae, Promerycochoerinae, Ticholeptinae, Ustatochoerinae, Diplotremus
Subtaxa: Eucrotaphus Merycoidodon Mesoreodon
Ecology: ground dwelling herbivore
Distribution:
• Miocene of United States (1: Florida collection)
• Harrisonian of United States (5: South Dakota, Wyoming)
• Arikareean of United States (22: California, Idaho, Montana, Nebraska, South Dakota, Wyoming)
• Oligocene of Canada (1: Saskatchewan), United States (148: Colorado, Florida, Montana, Nebraska, North Dakota, Oregon, South Dakota, Washington, Wyoming)
• Eocene to Oligocene of Mexico (1), United States (1: Wyoming)
• Eocene of Canada (2: Saskatchewan), Mexico (1), United States (30: Colorado, Montana, Nebraska, South Dakota, Texas, Wyoming)
Total: 212 collections including 238 occurrences