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Temporal range: late Miocene
Protohippus simus.jpg
Protohippus simus skeleton
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Subfamily: Equinae
Tribe: Equini
Genus: Protohippus

Protohippus is an extinct three-toed genus of horse.[1] It was roughly the size of a modern donkey. Fossil evidence suggests that it lived during the Late Miocene and Early Pliocene, from about 14 Ma to 6 Ma.[2]

Analysis of Protohippus' skull and teeth suggests that it is most closely related to the genus Calippus.[3]

Species include:

  • P. vetus
  • P. perditus
  • P. supremus (also P. simus)
  • P. gidleyi