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Temporal range: 4.9–0.011 Ma
Blancan to Rancholabrean
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Genus: Haringtonhippus
Heintzman et al., 2017
Type species
Equus francisci
Hay, 1915[1]
  • Haringtonhippus francisci (Hay, 1915)
Synonyms[citation needed]

For H. francisci

  • Equus francisci Hay, 1915
  • Equus achates
  • Equus quinni

Haringtonhippus is an extinct genus of stilt-legged horse, which was native to North America in the Pleistocene.[2] The genus was described in 2017 by Peter D. Heintzman and colleagues. The genus is monospecific, consisting of the species Haringtonhippus francisci, initially described in 1915 by Oliver Perry Hay (as Equus francisci). Prior to its formal description, it was informally referred to (at least in part) as the New world stilt-legged Horse.

Haringtonhippus fossils have only been discovered in North America.[3] Specimens of Haringtonhippus have been found from northern Texas to southern South Dakota and in Alberta, Canada,[2] at sites such as Gypsum Cave and Natural Trap Cave.[3] Evidence shows that this genus evolved in North America.[4] The genus most likely became extinct around the end of the Pleistocene.[3]


Haringtonhippus is named after Charles Richard Harington.[3] Haringtonhippus was originally described as a new Equus species, E. francisci, in 1915.[1] Dalquest (1979) considered Equus tau Owen, 1869, described from teeth in Mexico, a senior synonym of E. francisci,[5] while Equus quinni and E. arrelanoi were synonymized with E. francisci by Winans (1989).[6] The species Equus achates Hay and Cook, 1930 (synonymized with E. tau by Dalquest 1979) was synonymized with E. francisci by Hulbert (1995), who also declared E. tau and E. littoralis a nomen dubium.[2][7]


A 2017 paper by Heintzman and colleagues placed Equus francisci outside Equus based a phylogenetic analysis of DNA sequences, leading to erection of the new genus Haringtonhippus for E. francisi. The genus is phylogenetically closer to Equus than to Hippidion. Haringtonhippus is estimated to have diverged from Equus roughly around 4 to 6 million years ago.[3]


  1. ^ a b Hay, Oliver P. (1915). "Contributions to the Knowledge of the Mammals of the Pleistocene of North America". Proceedings of the United States National Museum. 48 (2086): 535–549. doi:10.5479/si.00963801.48-2086.515Freely accessible. 
  2. ^ a b c Equus francisci Hay 1915 (horse) at fossilworks.org (retrieved 29 November 2017)
  3. ^ a b c d e Heintzman, Peter D; Zazula, Grant D; MacPhee, Ross DE; Scott, Eric; Cahill, James A; McHorse, Brianna K; Kapp, Joshua D; et al. (2017). "A new genus of horse from Pleistocene North America". eLife. 6. doi:10.7554/eLife.29944Freely accessible. 
  4. ^ Weinstock, Jaco; Willerslev, Eske; Sher, Andrei; Tong, Wenfei; Ho, Simon Y.W; Rubenstein, Dan; Storer, John; et al. (2005). "Evolution, Systematics, and Phylogeography of Pleistocene Horses in the New World: A Molecular Perspective". PLoS Biology. 3 (8): e241. doi:10.1371/journal.pbio.0030241Freely accessible. 
  5. ^ Dalquest, Walter W. (1979). "The Little Horses (Genus Equus) of the Pleistocene of North America". The American Midland Naturalist. 101 (1): 241–244. JSTOR 2424920. 
  6. ^ Winans, M. C. 1989. A quantitative study of the North American fossil species of the genus Equus. Pp. 262-297, in The evolution of perissodactyls (D. R. Prothero & R. M. Schoch, eds.), Oxford Monographs Geol. Geophysics, no. 15, 537 pp.
  7. ^ Hulbert, R. C. 1995. Equus from Leisey Shell Pit 1A and other Irvingtonian localities from Florida. Bulletin of the Florida Museum of Natural History 37:553—602.