What extinct equid form is cited as tracing the ancestry of the genus *Equus*?
Answer
*Pliohippus*
The evolutionary history of the genus *Equus*, which encompasses all modern zebras, horses, and asses, is traced backward through various extinct ancestral species. The text specifically points to *Pliohippus* as a precursor form from which the lineage of modern equids, including the specialized zebra line, eventually emerged. This ancestral connection highlights the deep evolutionary timescale involved in the specialization of zebras for the African plains environment.
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The Evolution of Zebras - YouTube
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