''Protohippus'' is an extinct three-toed
genus of
horse.
It was roughly the size of a modern donkey. Fossil evidence suggests that it lived during the Late Miocene (
Clarendonian to
Hemphillian), from about 13.6 Ma to 5.3 Ma.
Analysis of ''Protohippus'' skull and teeth suggests that it is most closely related to the genus ''
Calippus''.
Species include:
* ''P. vetus''
* ''P. perditus''
* ''P. supremus'' (also ''P. simus'')
* ''P. gidleyi''
See also
* ''
Eohippus''
* ''
Mesohippus''
References
{{Taxonbar, from=Q3408120
Miocene horses
Prehistoric placental genera
Miocene mammals of North America
Clarendonian
Hemphillian
Fossil taxa described in 1858
Taxa named by Joseph Leidy
