Classification of Downs and Miller 1994

G. Equus Linnaeus 1758 [horse]
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Equus idahoensis Merriam 1918
Invalid names: Dolichohippus Heller 1912 [synonym], Equus (Parastilidequus) Mooser and Dalquest 1975 [invalid subgroup], Equus parastylidens Mooser 1959 [nomen dubium]
Equus simplicidens Cope 1892
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Invalid names: Plesippus shoshonensis Gidley 1930 [synonym]
Subg. †Equus (Dolichohippus) Heller 1912
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Equus (Dolichohippus) enormis Downs and Miller 1994