Mammalia - Ungulata - Merycoidodontidae
Alternative spelling: Otionohyus (Otarohyus)
Full reference: C. B. Schultz and C. H. Falkenbach. 1968. The Phylogeny of the Oreodonts. Part 1: Merycoidodontinae, Eporeodontinae, and Leptaucheniinae, Three Subfamilies Of Oreodonts, With an Appendix to the Revision Of The Merycoidodontidae, and Part 2. Summary and Conclusions Concerning the Merycoidodontidae. Bulletin of the American Museum of Natural History 139:1-498
Parent taxon: Merycoidodon according to M. S. Stevens and J. B. Stevens 1996
See also Schultz and Falkenbach 1968
Sister taxa: Merycoidodon (Anomerycoidodon), Merycoidodon (Blickohyus), Merycoidodon (Merycoidodon), Merycoidodon minor, Paramerycoidodon (Gregoryochoerus), Paramerycoidodon (Barbourochoerus), Genetochoerus (Osbornohyus)
Subtaxa: Merycoidodon (Otarohyus) bullatus Merycoidodon (Otarohyus) major
Ecology: ground dwelling herbivore
Distribution:
• Arikareean of United States (3: Oregon, Wyoming collections)
• Oligocene of United States (57: Colorado, Nebraska, North Dakota, South Dakota, Wyoming)
Total: 60 collections including 61 occurrences