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Temporal range: Barstovian-Clarendonian
~15.97–10.3 Ma
Hypohippus skeleton.jpg
Hypohippus osborni skeleton
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Subfamily: Anchitheriinae
Genus: Hypohippus
Leidy, 1858
  • H. affinis Leidy 1858
  • H. osborni

Hypohippus (Greek: "under" (hypos), "horse" (hippos)[1]) is an extinct genus of three-toed horse, which lived 17–11 million years ago.[2] It was the largest anchitherine equid about the size of a modern domestic horse, at 403–600 kg (888–1,323 lb)[3][4] and 1.8 m (5.9 ft) long. Fossils of it have been found in Nebraska, Colorado, and Montana.[5][6]



  1. ^ "Glossary. American Museum of Natural History". Archived from the original on 20 November 2021.
  2. ^ Janis, C. M.; Damuth, J.; Theodor, J. M. (2002). "The origins and evolution of the North American grassland biome: The story from the hoofed mammals". Palaeogeography, Palaeoclimatology, Palaeoecology. 177 (1–2): 183–198. Bibcode:2002PPP...177..183J. doi:10.1016/S0031-0182(01)00359-5.
  3. ^ Bruce J. MacFadden (1992). Fossil Horses: Systematics, Paleobiology, and Evolution of the Family Equidae. Cambridge University Press. p. 284. ISBN 0521477085. Retrieved 21 September 2022.
  4. ^ Kathleen M. Janis (1998). Evolution of Tertiary Mammals of North America: Volume 1, Terrestrial, Carnivores, Ungulates and Ungulatel-like mammals. Cambridge University Press. p. 545. Retrieved 21 September 2022.
  5. ^ Hypohippus
  6. ^ "Hypohippus". Florida Museum. 2018-02-16. Retrieved 2021-08-14.