Mammalia - Perissodactyla - Equidae
Alternative combinations: Eohippus index, Hyracotherium index, Minippus index, Orotherium index
Synonyms: Hyracotherium sandrae Gingerich 1989, Hyracotherium sulcatus Gingerich 1989, Minippus jicarillai Froehlich 2002, Orotherium loevii Cope 1877, Pliolophus loevii Cope 1877, Sifrhippus sandrae Gingerich 1989
Full reference: E. D. Cope. 1873. Fourth notice of extinct Vertebrata from the Bridger and the Green River tertiaries. Palaeontological Bulletin 17:1-4
Belongs to Sifrhippus according to J. E. Rej and S. G. Lucas 2016
See also Cope 1873, Froehlich 2002, Gazin 1952, Gazin 1962, Gingerich 1989, Gingerich 1991, Granger 1908, Hay 1902, Kitts 1957, Kitts 1956, MacFadden 1998, Rose et al. 2012, Secord et al. 2012, Stirton 1940 and Wortman 1896
Sister taxa: Sifrhippus grangeri, Arenahippus pernix, Arenahippus aemulor
Type specimens:
- Sifrhippus index: AMNH 4680, a mandible
- Hyracotherium sulcatus:
- Minippus jicarillai: NMMNH P9239, a mandible (left mandible fragment with P3–M3).
- Orotherium loevii: USNM 1128, a mandible (fragment of lower jaw with P2-m2).
- Sifrhippus sandrae:
Distribution:
• Eocene of Belgium (1 collection), United States (41: New Mexico, Texas, Wyoming)
Total: 42 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.