Mammalia - Perissodactyla - Equidae
Alternative combinations: Hipparion isonesum, Hippotherium isonesum, Merychippus (Merychippus) isonesus, Merychippus isonesus, Neohipparion isonesum, Stylonus isonesus
Synonyms: Merychippus (Merychippus) praecocidens Russell 1933, Merychippus praecocidens Russell 1933
Full reference: E. D. Cope. 1889. A review of the North American species of Hippotherium. Proceedings of the American Philosophical Society 26(130):429-458
Belongs to Acritohippus according to T. S. Kelly 1998
See also Cope 1889, Downs 1956, Downs 1961, Fremd 1994, Gidley 1907, Hay 1902, Hulbert and MacFadden 1991, Kelly 1995, Kelly and Lander 1988, Lull 1907, MacFadden 1998, MacFadden and Nelson 1980, Matthew 1909, Matthew 1924, Osborn 1918, Russell 1933, Scharf 1935, Stirton 1940, Storer 1975, Tedford et al. 1987 and Wallace 1946
Sister taxa: Acritohippus quinni, Acritohippus stylodontus, Acritohippus tertius
Subtaxa: Merychippus isonesus quartus Merychippus isonesus quintus Merychippus isonesus tertius
Type specimens:
- Acritohippus isonesus: AMNH 8175, a partial skeleton (A nearly complete skull, cervical vertebrre, pelvis and hind limbs)
- Merychippus praecocidens: NMC 8624, a tooth (right M3). Its type locality is Wood Mountain, which is in a Barstovian terrestrial horizon in the Wood Mountain Formation of Canada.
Ecology: ground dwelling grazer-browser
Distribution:
• Hemphillian of United States (1: Montana collection)
• Miocene of Canada (12: Saskatchewan), United States (44: California, Florida, Idaho, Montana, Nebraska, New Mexico, Oregon)
Total: 57 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.