Miohippus (meaning "small horse") is an extinct genus of horse existing longer than most Equidae. It lived in what is now North America from 32 to 25 million years ago, during the late Eocene to late Oligocene. [2]

Miohippus, genus of extinct horses that originated in North America during the Late Eocene Epoch (37.2–33.9 million years ago). Miohippus evolved from the earlier genus Mesohippus; however, the former was larger and had a more-derived dentition than the latter.

Mar 17, 2017 · Miohippus was one of the most successful prehistoric horses of the Tertiary period; this three-toed genus (which was closely related to the similarly named Mesohippus) was represented by about a dozen different species, all of them indigenous to North America from about 35 to 25 million years ago.

Aug 4, 2021 · During the Miocene, over a dozen genera existed. Today, only one genus of horses survives: Equus. Where & When? Fossils of Miohippus are found at many Oligocene localities in the Great Plains, the western US and a few places in Florida. Species in this genus lived from about 32-25 million years ago.

Feb 13, 2025 · The descendants of Miohippus split into various evolutionary branches during the early Miocene (the Miocene Epoch lasted from about 23 million to 5.3 million years ago). One of these branches, known as the anchitheres, included a variety of three-toed browsing horses comprising several genera.

Feb 8, 2019 · A few million years after Mesohippus comes Miohippus: a slightly larger (100 pound) equid that achieved a widespread distribution across the North American plains during the late Eocene epoch.

During the Eocene and Oligocene, in North America (see below for elsewhere) the early horses developed through intermediate genera known as Orohippus, Epihippus and Mesohippus, to Miohippus by about 35 Mya. Compared to Eohippus, Miohippus was somewhat larger and had longer legs and feet.

Miohippus was a horse of the Oligocene. According to the Florida Museum of Natural History, Othniel Charles Marsh first believed Miohippus lived during the Miocene and thus named the genus using this incorrect conclusion.

Miohippus is exceedingly rare east of the Mississippi River. Taken together there are only a handful of specimens pertaining to Miohippus from the eastern U.S., the others of which include fragmentary teeth and broken bones.

Jan 8, 2019 · These are teeth from the Oligocene 3-toed horse - Mesohippus or Miohippus - part of a right lower jaw, I believe. Bob