Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Infraclassis: Placentalia
Cladus: Boreoeutheria
Superordo: Laurasiatheria
Cladus: Scrotifera
Cladus: Ferungulata
Cladus: Euungulata
Ordo: Perissodactyla
Superfamilia: Equoidea
Familia: Equidae
Subfamilia: †Anchitheriinae
Genus: Hypohippus
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. It was a long-necked, high-shouldered browser with sub-hypsodont, lophodont (rhino-like) dentition, that fed on the tough vegetation of forest understory and shrubs. Its deep preorbital fossae and retraction of the nasal notch hint at the presence of a long, muscular and prehensile upper lip that would aid during selective browsing. Overall its ecology would have been more comparable to modern okapi than to grazing horses.[5] Fossils of it have been found in Nebraska, Colorado, and Montana.[6][7]
20th century restoration by Heinrich Harder.
Life restoration showing a prominent, prehensile upper lip.
References
"Glossary. American Museum of Natural History". Archived from the original on 20 November 2021.
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.
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.
Christine M. Janis (1998). Evolution of Tertiary Mammals of North America: Volume 1, Terrestrial, Carnivores, Ungulates and Ungulate-like mammals. Cambridge University Press. p. 545. ISBN 9780521355193. Retrieved 21 September 2022.
Evans, J. W.; Bennett, Debb (2008). The Elsevier World Animal Science Encyclopedia (PDF). pp. 1–37.
Hypohippus
"Hypohippus". Florida Museum. 2018-02-16. Retrieved 2021-08-14.
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