Alternative combinations: Hipparion affine, Hippotherium affine
Synonyms: Hipparion dolichops Gidley 1906, Hipparion speciosum Leidy 1854, Hipparion whitneyi Gidley 1903, Hippodon speciosus Leidy 1854, Hippotherium speciosum Leidy 1854, Merychippus speciosum Leidy 1854, Neohipparion dolichops Gidley 1906, Neohipparion speciosum Leidy 1854, Neohipparion whitneyi Gidley 1903
See also Cope 1889, Cope 1893, Gidley 1903, Gidley 1903, Gidley 1907, Gregory 1942, Hay 1902, Hulbert 1987, Leidy 1854, Leidy 1857, Leidy 1873, Macdonald 1992, MacFadden 1984, MacFadden 1998, Matthew 1909, Matthew 1924, Matthew and Stirton 1930, McGrew 1938, Osborn 1904, Osborn 1918, Quinn 1955, Skinner and Taylor 1967, Stirton 1940 and Webb 1969
- Neohipparion affine: USNM 584, a set of teeth (Five uppermolars of one individual; left m1, m2, p4, and right p4, p3). Its type locality is Porcupine Butte, which is in a Clarendonian terrestrial horizon in the Ash Hollow Formation of South Dakota.
- Hippotherium speciosum:
- Neohipparion dolichops: AMNH 10865, a maxilla (A portion of upper jaw containing teeth, p2 to m2). Its type locality is Canyon of Little White River, which is in a Clarendonian/Hemphillian terrestrial horizon in the Ash Hollow Formation of South Dakota.
- Neohipparion whitneyi: AMNH 9815, a skeleton (A complete skull and skeleton of an adult female individual immediately associated with incomplete skeletons of five other individuals, immature, undoubtedly be). Its type locality is Canyon of Little White River, which is in a Clarendonian/Hemphillian terrestrial horizon in the Ash Hollow Formation of South Dakota.
Ecology: ground dwelling grazer
Total: 18 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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