Classification of Osborn 1918
G. †Mastodon Cuvier 1817
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Fm. Equidae Gray 1821 [horse]
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G. †Hypohippus Leidy 1858
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†Hypohippus affinis Leidy 1858
†Hypohippus equinus Scott 1893
†Hypohippus nevadensis Merriam 1913
†Hypohippus osborni Gidley 1907
Invalid names: Hypohippus (Drymohippus) Merriam 1913 [invalid subgroup]
G. †Miohippus Marsh 1874
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†Miohippus acutidens Sinclair 1905
†Miohippus anceps Marsh 1874
†Miohippus annectens Marsh 1874
†Miohippus brachylophus Cope 1879
†Miohippus brachystylus Osborn 1904
†Miohippus crassicuspis Osborn 1904
†Miohippus equiceps Cope 1878
†Miohippus equinanus Osborn 1918
†Miohippus gemmarosae Osborn 1918
†Miohippus gidleyi Osborn 1904
†Miohippus intermedius Osborn and Wortman 1895
†Miohippus meteulophus Osborn 1904
†Miohippus primus Osborn 1918
†Miohippus quartus Osborn 1918
†Miohippus validus Osborn 1904
Invalid names: Miohippus condoni Leidy 1870 [nomen dubium]
Invalid names: Hippodon Leidy 1854 [nomen nudum], Hippodon speciosus Leidy 1854 [nomen nudum]
G. †Anchitherium von Meyer 1844
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Invalid names: Anchitherium longicristis Cope 1878 [nomen dubium], Mesohippus exoletus Cope 1874 [nomen dubium]
G. †Hipparion de Christol 1832
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†Hipparion affine Leidy 1869
†Hipparion anthonyi Merriam 1916
†Hipparion coloradense Osborn 1918
†Hipparion condoni Merriam 1915
†Hipparion dolichops Gidley 1906
†Hipparion gidleyi Merriam 1915
†Hipparion ingenuum Leidy 1885
†Hipparion lenticulare Cope 1893
†Hipparion leptode Merriam 1915
†Hipparion minor Sellards 1916
†Hipparion mohavense Merriam 1913
†Hipparion molle Merriam 1915
†Hipparion montezuma Leidy 1882
†Hipparion occidentale Leidy 1856
†Hipparion peninsulatum Cope 1885
†Hipparion platystyle Merriam 1915
†Hipparion plicatile Leidy 1887
†Hipparion rectidens Cope 1886
†Hipparion sinclairi Wortman 1882
†Hipparion venustum Leidy 1853
†Hipparion whitneyi Gidley 1903
Invalid names: Hipparion eurystyle Cope 1893 [nomen dubium], Hipparitherium Christol 1847 [synonym], Hippotherium Kaup 1832 [synonym], Neohipparion Gidley 1903 [synonym]
G. †Kalobatippus Osborn 1915
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†Kalobatippus agatensis Osborn 1918
†Kalobatippus gracilis Marsh 1892
†Kalobatippus praestans Cope 1879
G. †Merychippus Leidy 1856
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†Merychippus calamarius Cope 1875
†Merychippus californicus Merriam 1915
†Merychippus campestris Gidley 1907
†Merychippus eohipparion Osborn 1918
†Merychippus eoplacidus Osborn 1918
†Merychippus insignis Leidy 1856
†Merychippus intermontanus Merriam 1915
†Merychippus isonesus Cope 1889
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†Merychippus isonesus primus Osborn 1918
†Merychippus isonesus quartus Osborn 1918
†Merychippus isonesus quintus Osborn 1918
†Merychippus isonesus secundus Osborn 1918
†Merychippus isonesus tertius Osborn 1918
†Merychippus labrosus Cope 1874
†Merychippus missouriensis Douglass 1908
†Merychippus paniensis Cope 1874
†Merychippus patruus Osborn 1918
†Merychippus proparvulus Osborn 1918
†Merychippus relictus Cope 1889
†Merychippus republicanus Osborn 1918
†Merychippus sejunctus Cope 1874
†Merychippus seversus Cope 1878
†Merychippus sphenodus Cope 1889
†Merychippus sumani Merriam 1915
Invalid names: Merychippus stylodus Merriam 1915 [nomen nudum], Stylonus Cope 1878 [synonym]
G. †Mesohippus Marsh 1875
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†Mesohippus assiniboiensis Lambe 1905
†Mesohippus bairdii Leidy 1850
†Mesohippus celer Marsh 1874
†Mesohippus eulophus Osborn 1904
†Mesohippus hypostylus Osborn 1904
†Mesohippus latidens Douglass 1903
†Mesohippus montanensis Osborn 1904
†Mesohippus obliquidens Osborn 1904
†Mesohippus planidens Lambe 1905
†Mesohippus portentus Douglass 1908
†Mesohippus praecocidens Lambe 1905
†Mesohippus propinquus Lambe 1905
†Mesohippus proteulophus Osborn 1904
†Mesohippus stenolophus Lambe 1905
†Mesohippus trigonostylus Osborn 1918
†Mesohippus westoni Cope 1889
Invalid names: Mesohippus cuneatus Cope 1873 [nomen dubium]
G. †Parahippus Leidy 1858
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†Parahippus agrestis Leidy 1873
†Parahippus australis Leidy 1873
†Parahippus avus Marsh 1874
†Parahippus brevidens Marsh 1874
†Parahippus cognatus Leidy 1858
†Parahippus crenidens Scott 1893
†Parahippus leonensis Sellards 1916
†Parahippus minimus Douglass 1899
†Parahippus pristinus Osborn 1918
†Parahippus taxus Douglass 1908
†Parahippus texanus Leidy 1868
†Parahippus tyleri Loomis 1908
Invalid names: Altippus Douglass 1908 [synonym], Anchippus Leidy 1868 [synonym], Desmatippus Scott 1893 [synonym]
G. †Pliohippus Marsh 1874
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†Pliohippus coalingensis Merriam 1914
†Pliohippus cumminsii Cope 1893
†Pliohippus fairbanksi Merriam 1915
†Pliohippus fossulatus Cope 1893
†Pliohippus interpolatus Cope 1893
†Pliohippus leidyanus Osborn 1918
†Pliohippus lullianus Troxell 1916
†Pliohippus minutus Cope 1893
†Pliohippus mirabilis Leidy 1858
†Pliohippus nobilis Osborn 1918
†Pliohippus pernix Marsh 1874
†Pliohippus phlegon Hay 1899
†Pliohippus proversus Merriam 1916
†Pliohippus robustus Marsh 1874
†Pliohippus simplicidens Cope 1892
†Pliohippus spectans Cope 1880
†Pliohippus supremus Leidy 1869
†Pliohippus tantalus Merriam 1913
G. †Protohippus Leidy 1858
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†Protohippus castilli Cope 1886
†Protohippus niobrarensis Gidley 1906
†Protohippus pachyops Cope 1893
†Protohippus parvulus Marsh 1868
†Protohippus placidus Leidy 1869
†Protohippus profectus Cope 1889
†Protohippus proplacidus Osborn 1918
†Protohippus retrusus Cope 1889
†Protohippus simus Gidley 1906
†Protohippus tehonensis Merriam 1915
G. †Rhynchotherium Falconer 1868
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†Rhynchotherium shepardi Leidy 1870
Invalid names: Dibelodon Cope 1884 [synonym]
G. †Tetralophodon Falconer 1857
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†Tetralophodon mirificus Leidy 1858
Invalid names: Rhabdobunus Hay 1914 [synonym]
†Equus fraternus Leidy 1858
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Invalid names: Hippotherium princeps Leidy 1890 [synonym]
G. †Euelephas
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†Euelephas columbi Falconer 1857 [Columbian mammoth]
†Euelephas imperator Leidy 1858 [imperial mammoth]
†Euelephas meridionalis Nesti 1825
Invalid names: Archidiskodon Pohling 1888 [synonym]
G. †Trilophodon Falconer 1857
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†Trilophodon lulli Barbour 1914
†Trilophodon morrilli Barbour 1914
Invalid names: Eubelodon Barbour 1914 [synonym]