Temporal range: Late Pleistocene
Equus niobrarensis (or commonly, Niobrara horse) is an extinct species of Equus, the genus that includes the horse. E. niobrarensis may be synonymous with Equus scotti. It was "stout-legged" and belonged to the "big horses" category as defined by M. C. Winans. The skull of the horse was noted as being broader than Equus caballus.
E. niobrarensis was native to North America and commonly found in western North America and dates to the late Pleistocene. Fossils of E. niobrarensis were discovered at Dry Cave in Wisconsin. Another mention of an E. niobrarensis discovery was in Skeleton Cave, Oregon.
- O. P. Hay. 1913. Notes on some fossil horses, with descriptions of four new species. Bulletin of the United States National Museum 44(1969):569-594
- Equus niobrarensis Hay in GBIF Secretariat (2017). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via https://www.gbif.org/species/4969213 on 2019-01-17.
- "†Equus niobrarensis Hay 1913 (horse)" (html). Fossilworks. Retrieved 17 January 2019.
- "Equus Nomenclature". Utep.edu. Retrieved 2018-01-03.
- utep.edu Albuquerque Gravel Pits. Retrieved 2 September 2018.
- "Evolution of the Horse Brain". Books.Google.com. Retrieved 2018-01-03.
- "Late Pleistocene Vertebrates from a Rockshelter in Cimarron County, Oklahoma" (PDF). ResearchGate.net. Retrieved 2018-01-03.
- "†Equus conversidens Owen 1869—Mexican Horse". Utep.edu. Retrieved 2018-01-03.
- Unknown (1940-12-13), "Teeth Belonged to a Horse Named Equus Niobrarensis", Bend Bulletin, p. 1
- Unknown (1940-11-25), "Ancient Teeth Found in Cave", Bend Bulletin, p. 1, retrieved 2010-09-22