Dinohippus

Dinohippus Temporal range: Middle Miocene-Late Pliocene (Hemphillian-Blancan) ~
Dinohippus leidyanus skeleton
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Subfamily:	Equinae
Tribe:	Equini
Genus:	†Dinohippus Quinn, 1955
Type species
†Pliohippus leidyanus
Species
†D. edensis Frick, 1924 †D. interpolatus Cope, 1893 †D. leardi Drescher, 1941 †D. leidyanus Osborn, 1918 †D. mexicanus Lance, 1950 †D. osborni Frick, 1924 †D. pachyops Cope, 1893 †D. subvenus Quinn, 1955

Dinohippus (Greek: "Terrible horse") is an extinct equid which was endemic to North America from the late Hemphillian stage of the Miocene through the Zanclean stage of the Pliocene (10.3—3.6 mya) and in existence for approximately 6.7 million years. Fossils are widespread throughout North America, being found at more than 30 sites from Florida to Alberta and Panama (Alajuela Formation).

Taxonomy

Skull

Quinn originally referred "Pliohippus" mexicanus to Dinohippus, but unpublished cladistic results in an SVP 2018 conference abstract suggest that mexicanus is instead more closely related to extant horses than to Dinohippus.

Description

Dinohippus was the most common horse in North America and like Equus, it did not have a dished face. It has a distinctive passive "stay apparatus" formed from bones and tendons to help it conserve energy while standing for long periods. Dinohippus was the first horse to show a rudimentary form of this character, providing additional evidence of the close relationship between Dinohippus and Equus. Dinohippus was originally thought to be a monodactyl horse, but a 1981 fossil find in Nebraska shows that some were tridactyl. The species D. leidyanus had an estimated body mass of approximately 200 kilograms (440 lb).

Foot bones