Classification of Macdonald 1992
†Anchippus brevidens Marsh 1874
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†Anchippus texanus Leidy 1868
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G. †Anchippus Leidy 1868
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†Anchitherium agreste Leidy 1873
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†Anchitherium australis Leidy 1873
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†Anchitherium longicristis Cope 1878
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†Anchitherium minimus Douglass 1899
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†Anchitherium westoni Cope 1889
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†Equus cumminsii Cope 1893
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†Equus eurystylus Cope 1893
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†Equus parvulus Marsh 1868
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†Equus simplicidens Cope 1892
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†Hipparion affine Leidy 1869
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†Hipparion anthonyi Merriam 1916
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†Hipparion coloradense Osborn 1918
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†Hipparion condoni Merriam 1915
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†Hipparion gratum Leidy 1869
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†Hipparion minor Sellards 1916
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†Hipparion mohavense Merriam 1913
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†Hipparion occidentale Leidy 1856
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†Hipparion platystyle Merriam 1915
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†Hippidium interpolatum Cope 1893
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†Hippidium spectans Cope 1880
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G. †Hippodon Leidy 1854
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†Hippotherium ingenuum Leidy 1885
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†Hippotherium montezumae Leidy 1882
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†Hippotherium paniense Cope 1874
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†Hippotherium peninsulatum Cope 1885
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†Hippotherium plicatile Leidy 1887
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†Hippotherium princeps Leidy 1890
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†Hippotherium rectidens Cope 1886
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†Hippotherium relictum Cope 1889
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†Hippotherium sphenodus Cope 1889
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†Hippotherium sinclairi Wortman 1882
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†Hippotherium venustum Leidy 1853
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†Hypohippus (Drymohippus) nevadensis Merriam 1913
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†Kalobatippus agatensis Osborn 1918
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†Kalobatippus gracilis Marsh 1892
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†Merychippus californicus Merriam 1915
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†Merychippus eohipparion Osborn 1918
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†Merychippus eoplacidus Osborn 1918
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†Merychippus mirabilis Leidy 1858
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†Merychippus quartus Osborn 1918
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†Merychippus secundus Osborn 1918
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†Merychippus sumani Merriam 1915
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†Mesohippus planidens Lambe 1905
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†Mesohippus portentus Douglass 1908
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†Mesohippus praecocidens Lambe 1905
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†Mesohippus propinquus Lambe 1905
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†Mesohippus proteulophus Osborn 1904
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†Mesohippus stenolophus Lambe 1905
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†Miohippus crassicuspis Osborn 1904
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†Nannippus tehonensis Merriam 1916
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†Neohipparion gidleyi Merriam 1915
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†Neohipparion leptode Merriam 1915
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†Parahippus coloradensis Gidley 1907
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†Parahippus leonensis Sellards 1916
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†Parahippus mourningi Merriam 1913
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†Pliohippus fairbanksi Merriam 1915
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†Pliohippus minimus Macdonald 1992
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†Pliohippus nobilis Osborn 1918
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†Pliohippus pernix Marsh 1874
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†Pliohippus proversus Merriam 1916
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†Pliohippus robustus Marsh 1874
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†Pliohippus tantalus Merriam 1913
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†Protohippus castilli Cope 1886
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†Protohippus coalingensis Merriam 1914
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†Protohippus labrosus Cope 1874
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†Protohippus lenticulare Cope 1893
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†Protohippus pachyops Cope 1893
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†Protohippus placidus Leidy 1869
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†Protohippus proplacidus Osborn 1918
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†Protohippus simus Gidley 1906
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†Protohippus supremus Leidy 1869
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†Stylonus seversus Cope 1878
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G. †Stylonus Cope 1878
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G. †Merychippus Leidy 1856
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Invalid names: Merychippus patrusus Osborn 1918 [nomen dubium]
G. †Mesohippus Marsh 1875
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†Mesohippus bairdii Leidy 1850
†Mesohippus eulophus Osborn 1904
Invalid names: Mesohippus assiniboiensis Lambe 1905 [nomen dubium], Mesohippus cuneatus Cope 1873 [nomen dubium], Mesohippus exoletus Cope 1874 [nomen dubium], Mesohippus montanensis Osborn 1904 [nomen dubium]
G. †Protohippus Leidy 1858
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Invalid names: Hippodon speciosus Leidy 1854 [nomen dubium], Protohippus retrusus Cope 1889 [nomen dubium]