†Merychippus isonesus quartus Osborn 1918 (horse)
Mammalia - Perissodactyla - Equidae
Full reference: H. F. Osborn. 1918. Equidae of the Oligocene, Miocene, and Pliocene of North America, iconographic type revision. Memoirs of the American Museum of Natural History 2(1):1-217
Belongs to Merychippus isonesus according to H. F. Osborn 1918
See also Downs 1956, Macdonald 1992 and Stirton 1940
Sister taxa: Merychippus isonesus quintus, Merychippus isonesus tertius
Type specimen: AMNH 14184, a partial skeleton (Part of skeleton without skull parts or teeth.)
Ecology: ground dwelling grazer-browser
Distribution: there are no occurrences of Merychippus isonesus quartus in the database