"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.