Mammalia - Artiodactyla - Merycoidodontidae
Full reference: M. S. Stevens and J. B. Stevens. 1996. Merycoidodontinae and Miniochoerinae. The Terrestrial Eocene-Oligocene Transition in North America 498-573
Parent taxon: Merycoidodontidae according to M. S. Stevens et al. 2023
See also Stevens and Stevens 1996 and Stevens and Stevens 2007
Sister taxa: Aclistomycterinae, Brachycrurinae, Eporeodontinae, Leptaucheniinae, Merychyinae, Merychyus pariogonus, Merycochoerinae, Merycoidodontinae, Miniochoerinae, Oreonetinae, Phenacocoelinae, Promerycochoerinae, Ticholeptinae, Diplotremus
Subtaxa: Mediochoerus Ustatochoerus
Type: Ustatochoerus
Ecology: ground dwelling herbivore
Distribution:
• Hemphillian of United States (2: Nebraska collections)
• Miocene of United States (114: California, Colorado, Kansas, Nebraska, Nevada, New Mexico, Oklahoma, South Dakota, Texas, Wyoming)
• Harrisonian of United States (2: Texas)
• Arikareean of United States (4: California, Texas)
Total: 122 collections including 129 occurrences