| Hagerman horse Temporal range:
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|---|---|
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| Mounted skeleton of a Hagerman horse | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Perissodactyla |
| Family: | Equidae |
| Genus: | Equus |
| Species: | †E. simplicidens
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| Binomial name | |
| †Equus simplicidens | |
| Synonyms | |
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Equus simplicidens, sometimes known as the Hagerman horse or the American zebra is an extinct species in the horse family native to North America during the Pliocene and Early Pleistocene.[1][2] It is one of the oldest and most primitive members of the genus Equus. It is the state fossil of Idaho, where its abundant remains were discovered in 1928, specifically in Hagerman, Idaho.[5] They are also known from other US states including Arizona, California, Texas, Nebraska and Kansas.[2]
- ^ a b Skinner, M.F. (1972). "Order Perissodactyla". In Skinner, M.F.; Hibbard, C.W. (eds.). Early Pleistocene Preglacial and Glacial Rocks and Faunas of North-Central Nebraska. Vol. 148. New York: American Museum of Natural History. pp. 117–125. S2CID 129067309.
- ^ a b c Cirilli, Omar; Machado, Helena; Arroyo-Cabrales, Joaquin; Barrón-Ortiz, Christina I.; Davis, Edward; Jass, Christopher N.; Jukar, Advait M.; Landry, Zoe; Marín-Leyva, Alejandro H.; Pandolfi, Luca; Pushkina, Diana; Rook, Lorenzo; Saarinen, Juha; Scott, Eric; Semprebon, Gina (24 August 2022). "Evolution of the Family Equidae, Subfamily Equinae, in North, Central and South America, Eurasia and Africa during the Plio-Pleistocene". Biology. 11 (9): 1258. doi:10.3390/biology11091258. ISSN 2079-7737. PMC 9495906. PMID 36138737.
- ^ Cope, E. D. (1892). "A Contribution to the Vertebrate Paleontology of Texas". Proceedings of the American Philosophical Society. 30 (137): 124–125. JSTOR 983215.
- ^ Cite error: The named reference
Gidley1930was invoked but never defined (see the help page). - ^ Idaho: Equus simplicidens (state fossil). StateFossils.com [dead link]