Epihippus
Epihippus is an extinct genus of the modern horse family Equidae that lived in the Eocene, from 46 to 38 million years ago. "Epihippus" is believed to have evolved from "Orohippus", which continued the evolutionary trend of increasingly efficient grinding teeth. "Epihippus" had five grinding, low-crowned cheek teeth with well-formed crests. A late species of "Epihippus", sometimes referred to as "Duchesnehippus intermedius", had teeth similar to Oligocene equids, although slightly less developed. Whether "Duchesnehippus" was a subgenus of "Epihippus" or a distinct genus is disputed. This is an early species of a horse. There are three species