Merychippus

Merychippus Temporal range: Miocene, 15.9–10.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Skeletal reconstruction of Merychippus on display at the American Museum of Natural History
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Subfamily:	Equinae
Genus:	†Merychippus Leidy, 1856
Type species
†Merychippus insignis Leidy, 1856[1]
Species
Species †M. brevidontus Bode, 1935 †M. calamarius Cope, 1875 †M. californicus Merriam, 1915 †M. coalingensis Clark, 1921 †M. coloradense Osborn, 1918 †M. eohipparion Osborn, 1918 †M. eoplacidus Osborn, 1918 †M. gunteri Simpson, 1930 †M. insignis Cope, 1874 †M. labrosus Cope, 1874 †M. missouriensis Douglass, 1908 †M. patrusus Osborn, 1918 †M. primus Osborn, 1918 †M. proparvulus Osborn, 1918 †M. quartus Stirton, 1940 †M. quintus Kelly and Lander, 1988 †M. relictus Cope, 1889 †M. republicanus Osborn, 1918 †M. secundus Abel, 1928 †M. sejunctus Cope, 1874 †M. seversus Cope, 1878 †M. stevensi Dougherty, 1940

Merychippus is an extinct proto-horse of the family Equidae that was endemic to North America during the Miocene, 15.97–5.33 million years ago.^[2] It had three toes on each foot and is the first horse known to have grazed.