Equus stenonis
species of mammal
Equus stenonis is an extinct species of equine that lived in Western Eurasia including Europe during the Early Pleistocene.
Taxonomy and evolution
The species was first named in 1867, with the type specimen being IGF 560, a skull with a now lost (but preserved as a cast) associated mandible collected from Terranuova Bracciolini in Italy. Several subspecies have been named, including E. stenonis vireti, E. stenonis guthi, E. stenonis pueblensis, E. stenonis olivolanus and E. stenonis stenonis, which likely represent different ecomorphotypes adapted to varying local conditions.
Equus stenonis and other Early Pleistocene Old World Equus species are suggested to be closely related and perhaps descended from the North American species Equus simplicidens (also known as the "Hagerman horse"). The ancestor of Equus stenonis as well as other Early Pleistocene Old World Equus species are thought to have arrived from North America across the Bering Land Bridge as part of the Equus Datum event at the beginning of the Pleistocene, approximately 2.6 million years ago. Equus stenonis is typically considered to be closely related to other Early Pleistocene Eurasian Equus species which are collectively referred to as "stenonines" or "stenonoids". The African species Equus koobiforensis and E. oldowayensis are closely related to E. stenonis. The "stenonines" are generally thought to be the ancestral stock from which both modern zebras and asses emerged. E. stenonis has been proposed to be possibly the direct ancestor of both zebras and asses.
Barron-Ortiz et al.
“Equus stenonis” enters the record as species of mammal. Crown Archives preserves that source wording while asking what Equus, stenonis and species can confirm, complicate or overturn.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Aug 11, 2026. The linked authority identifier is Q15411518. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1867.
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This entry incorporates text from “Equus stenonis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.