Classification of Stirton 1940
G. †Hippodon Leidy 1854
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Fm. Equidae Gray 1821 [horse]
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G. †Anchitherium von Meyer 1844
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†Anchitherium agatensis Osborn 1918
†Anchitherium australis Leidy 1873
†Anchitherium avus Schlaikjer 1935
†Anchitherium clarenci Simpson 1932
†Anchitherium gracilis Marsh 1892
†Anchitherium navasotae Hay 1924
†Anchitherium praestans Cope 1879
Invalid names: Kalobatippus Osborn 1915 [synonym]
G. †Archaeohippus Gidley 1906
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†Archaeohippus blackbergi Hay 1924
†Archaeohippus minimus Douglass 1899
†Archaeohippus minutalis Hay 1924
†Archaeohippus mourningi Merriam 1913
†Archaeohippus nanus Simpson 1932
†Archaeohippus penultimus Matthew 1924
†Archaeohippus ultimus Cope 1886
G. †Calippus Matthew and Stirton 1930
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†Calippus placidus Leidy 1869
†Calippus regulus Johnston 1937
G. †Eohippus Marsh 1876
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†Eohippus angustidens Cope 1875
†Eohippus borealis Granger 1908
†Eohippus craspedotus Cope 1880
†Eohippus cristatus Wortman 1896
†Eohippus cristonensis Cope 1877
†Eohippus etsagicus Cope 1882
†Eohippus index Cope 1873
†Eohippus montanus Wortman 1896
†Eohippus resartus Granger 1908
†Eohippus validus Marsh 1876
†Eohippus venticolus Cope 1881
Invalid names: Protorohippus Wortman 1896 [synonym]
G. †Epihippus Marsh 1878
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Subg. †Epihippus (Duchesnehippus) Peterson 1932
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†Epihippus (Duchesnehippus) intermedius Peterson 1932
Subg. †Epihippus (Epihippus) Stirton 1940
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†Epihippus (Epihippus) gracilis Marsh 1871
†Epihippus (Epihippus) parvus Granger 1908
G. Equus Linnaeus 1758 [horse]
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†Equus cumminsi Cope 1893
†Equus francescana Frick 1921
†Equus idahoensis Merriam 1918
†Equus proversus Merriam 1916
†Equus shoshonensis Gidley 1930
†Equus simplicidens Cope 1892
Invalid names: Plesippus Matthew 1924 [synonym]
G. †Hipparion de Christol 1832
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†Hipparion anthonyi Merriam 1916
†Hipparion condoni Merriam 1915
†Hipparion mohavense Merriam 1913
†Hipparion platystyle Merriam 1915
†Hipparion plicatile Leidy 1887
G. †Hypohippus Leidy 1858
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†Hypohippus affinis Leidy 1858
†Hypohippus equinus Scott 1893
†Hypohippus nevadensis Merriam 1913
†Hypohippus osborni Gidley 1907
†Hypohippus pertinax Matthew 1918
G. †Merychippus Leidy 1856
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Subg. †Merychippus (Merychippus) Stirton 1940
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†Merychippus (Merychippus) brevidontus Bode 1935
†Merychippus (Merychippus) calamarius Cope 1875
†Merychippus (Merychippus) californicus Merriam 1915
†Merychippus (Merychippus) eohipparion Osborn 1918
†Merychippus (Merychippus) francisi Hay 1924
†Merychippus (Merychippus) gunteri Simpson 1930
†Merychippus (Merychippus) insignis Leidy 1856
†Merychippus (Merychippus) isonesus Cope 1889
†Merychippus (Merychippus) missouriensis Douglass 1908
†Merychippus (Merychippus) paniensis Cope 1874
†Merychippus (Merychippus) praecocidens Russell 1933
†Merychippus (Merychippus) relictus Cope 1889
†Merychippus (Merychippus) republicanus Osborn 1918
†Merychippus (Merychippus) seversus Cope 1878
†Merychippus (Merychippus) sphenodus Cope 1889
†Merychippus (Merychippus) sumani Merriam 1915
†Merychippus (Merychippus) westoni Simpson 1930
Invalid names: Merychippus (Merychippus) coalingensis Clark 1921 [nomen nudum], Merychippus (Merychippus) stylodus Merriam 1915 [nomen nudum]
Subg. †Merychippus (Protohippus) Leidy 1858
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†Merychippus (Protohippus) campestris Gidley 1907
†Merychippus (Protohippus) intermontanus Merriam 1915
†Merychippus (Protohippus) patruus Osborn 1918
†Merychippus (Protohippus) perditus Leidy 1858
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Invalid names: Merychippus (Protohippus) mirabilis Leidy 1858 [synonym]
†Merychippus (Protohippus) primus Osborn 1918
†Merychippus (Protohippus) profectus Cope 1889
†Merychippus (Protohippus) proplacidus Osborn 1918
†Merychippus (Protohippus) quartus Osborn 1918
†Merychippus (Protohippus) secundus Osborn 1918
†Merychippus (Protohippus) sejunctus Cope 1874
†Merychippus (Protohippus) tertius Osborn 1918
Invalid names: Hippodon speciosus Leidy 1854 [nomen dubium], Stylonus Cope 1878 [synonym]
G. †Mesohippus Marsh 1875
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†Mesohippus antiquus Schlaikjer 1935
†Mesohippus assiniboiensis Lambe 1905
†Mesohippus bairdii Leidy 1850
†Mesohippus barbouri Schlaikjer 1931
†Mesohippus celer Marsh 1874
†Mesohippus cuneatus Cope 1873
†Mesohippus eulophus Osborn 1904
†Mesohippus exoletus Cope 1874
†Mesohippus hypostylus Osborn 1904
†Mesohippus latidens Douglass 1903
†Mesohippus montanensis Osborn 1904
†Mesohippus obliquidens Osborn 1904
†Mesohippus planidens Lambe 1905
†Mesohippus praecocidens Lambe 1905
†Mesohippus propinquus Lambe 1905
†Mesohippus protentus Douglass 1908
†Mesohippus proteulophus Osborn 1904
†Mesohippus stenolophus Lambe 1905
†Mesohippus tribonostylus Osborn 1918
†Mesohippus westoni Cope 1889
Invalid names: Pediohippus Schlaikjer 1935 [synonym]
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 condoni Leidy 1870
†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 longicristis Cope 1878
†Miohippus metulophus Osborn 1904
†Miohippus primus Osborn 1918
†Miohippus quartus Osborn 1918
†Miohippus taxus Douglass 1908
†Miohippus validus Osborn 1904
Invalid names: Altippus Douglass 1908 [synonym]
G. †Nannippus Matthew 1926
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†Nannippus cragini Hay 1917
†Nannippus gratus Leidy 1869
†Nannippus ingenuus Leidy 1885
†Nannippus lenticularis Cope 1893
†Nannippus minor Sellards 1916
†Nannippus montezumae Leidy 1882
†Nannippus niobrarensis Gidley 1906
†Nannippus parvulus Marsh 1868
†Nannippus peninsulatus Cope 1885
†Nannippus retrusus Cope 1889
†Nannippus tehonensis Merriam 1916
†Nannippus venustus Leidy 1853
Invalid names: Pseudhipparion Ameghino 1904 [synonym]
G. †Neohipparion Gidley 1903
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†Neohipparion affine Leidy 1869
†Neohipparion coloradense Osborn 1918
†Neohipparion dolichops Gidley 1906
†Neohipparion eurystyle Cope 1893
†Neohipparion gidleyi Merriam 1915
†Neohipparion leptode Merriam 1915
†Neohipparion molle Merriam 1915
†Neohipparion occidentale Leidy 1856
†Neohipparion phosphorum Simpson 1930
†Neohipparion rectidens Cope 1886
†Neohipparion sinclairi Wortman 1882
†Neohipparion whitneyi Gidley 1903
Invalid names: Neohipparion sanfondensis Frick 1933 [nomen nudum], Neohipparion sanjuanensis Frick 1933 [nomen nudum]
G. †Orohippus Marsh 1872
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†Orohippus agilis Marsh 1873
†Orohippus ballardi Marsh 1871
†Orohippus major Marsh 1874
†Orohippus osbornianus Cope 1883
†Orohippus pumilus Marsh 1871
†Orohippus sylvaticus Leidy 1870
†Orohippus typicus Granger 1908
†Orohippus uintanus Marsh 1872
Invalid names: Helohippus Marsh 1892 [synonym], Lophiotherium Marsh 1871 [synonym]
G. †Parahippus Leidy 1858
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†Parahippus agrestis Leidy 1873
†Parahippus avus Marsh 1874
†Parahippus brevidens Marsh 1874
†Parahippus cognatus Leidy 1858
†Parahippus coloradensis Gidley 1907
†Parahippus crenidens Scott 1893
†Parahippus integer Matthew 1924
†Parahippus leonensis Sellards 1916
†Parahippus nebrascensis Peterson 1907
†Parahippus pawniensis Gidley 1907
†Parahippus pristinus Osborn 1918
†Parahippus texanus Leidy 1868
†Parahippus tyleri Loomis 1908
†Parahippus wyomingensis Schlaikjer 1935
Invalid names: Anchippus Leidy 1868 [synonym], Desmatippus Scott 1893 [synonym]
G. †Pliohippus Marsh 1874
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Subg. †Pliohippus (Astrohippus) Stirton 1940
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†Pliohippus (Astrohippus) ansae Matthew and Stirton 1930
†Pliohippus (Astrohippus) martini Hesse 1936
†Pliohippus (Astrohippus) osborni Frick 1921
Subg. †Pliohippus (Pliohippus) Stirton 1940
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†Pliohippus (Pliohippus) castilli Cope 1886
†Pliohippus (Pliohippus) coalingensis Merriam 1914
†Pliohippus (Pliohippus) edensis Frick 1921
†Pliohippus (Pliohippus) interpolatus Cope 1893
†Pliohippus (Pliohippus) leidyanus Osborn 1918
†Pliohippus (Pliohippus) lullianus Troxell 1916
†Pliohippus (Pliohippus) nobilis Osborn 1918
†Pliohippus (Pliohippus) pachyops Cope 1893
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Invalid names: Pliohippus (Pliohippus) fossulatus Cope 1893 [synonym]
†Pliohippus (Pliohippus) pernix Marsh 1874
†Pliohippus (Pliohippus) robustus Marsh 1874
†Pliohippus (Pliohippus) simus Gidley 1906
†Pliohippus (Pliohippus) spectans Cope 1880
†Pliohippus (Pliohippus) supremus Leidy 1869
†Pliohippus (Pliohippus) tantalus Merriam 1913
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Invalid names: Pliohippus (Pliohippus) fairbanksi Merriam 1915 [synonym]
†Pliohippus (Pliohippus) tehonensis Merriam 1915