Classification of MacFadden 1998
Fm. Equidae Gray 1821 [horse]
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Subfm. †Anchitheriinae Leidy 1869 [anchitheriine horse]
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G. †Anchitherium von Meyer 1844
G. †Archaeohippus Gidley 1906
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†Archaeohippus blackbergi Hay 1924
†Archaeohippus minimus Douglass 1899
†Archaeohippus mourningi Merriam 1913
†Archaeohippus penultimus Matthew 1924
†Archaeohippus stenolophus Lambe 1905
†Archaeohippus ultimus Cope 1886
G. †Desmatippus Scott 1893
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†Desmatippus crenidens Scott 1893
†Desmatippus integer Matthew 1924
†Desmatippus nebrascensis Peterson 1907
†Desmatippus texanus Leidy 1868
†Desmatippus tyleri Loomis 1908
Invalid names: Anchippus Leidy 1868 [synonym]
G. †Hypohippus Leidy 1858
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†Hypohippus affinis Leidy 1858
†Hypohippus chico MacFadden 1982
†Hypohippus equinus Scott 1893
†Hypohippus nevadensis Merriam 1913
†Hypohippus osborni Gidley 1907
G. †Kalobatippus Osborn 1915
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†Kalobatippus agatensis Osborn 1918
†Kalobatippus australis Leidy 1873
†Kalobatippus avus Schlaikjer 1935
†Kalobatippus clarencei Simpson 1932
†Kalobatippus gracilis Marsh 1892
†Kalobatippus navasotae Hay 1924
†Kalobatippus praestans Cope 1879
G. †Megahippus McGrew 1938
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†Megahippus matthewi Barbour 1914
†Megahippus mckennai Tedford and Alf 1962
G. †Mesohippus Marsh 1875
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†Mesohippus barbouri Schlaikjer 1931
†Mesohippus celer Marsh 1874
†Mesohippus grandis Clark and Beerbower 1967
†Mesohippus latidens Douglass 1903
†Mesohippus propinquus Lambe 1905
†Mesohippus texanus McGrew 1971
†Mesohippus westoni Cope 1889
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Invalid names: Mesohippus montanensis Osborn 1904 [synonym], Mesohippus praecocidens Lambe 1905 [synonym]
G. †Miohippus Marsh 1874
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†Miohippus equinanus Osborn 1918
†Miohippus gemmarosae Osborn 1918
†Miohippus gidleyi Osborn 1904
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Invalid names: Mesohippus grallipes Sinclair 1925 [synonym], Miohippus validus Osborn 1904 [synonym]
†Miohippus intermedius Osborn and Wortman 1895
†Miohippus obliquidens Osborn 1904
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Invalid names: Mesohippus brachystylus Osborn 1904 [synonym], Mesohippus eulophus Osborn 1904 [synonym], Mesohippus meteulophus Osborn 1904 [synonym]
Invalid names: Pediohippus Schlaikjer 1935 [synonym]
G. †Parahippus Leidy 1858
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†Parahippus agrestis Leidy 1873
†Parahippus cognatus Leidy 1858
†Parahippus coloradensis Gidley 1907
†Parahippus leonensis Sellards 1916
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Invalid names: Parahippus barbouri White 1942 [synonym], Parahippus vellicans Hay 1924 [synonym]
†Parahippus pawniensis Gidley 1907
†Parahippus pristinus Osborn 1918
†Parahippus wyomingensis Schlaikjer 1935
Subfm. Equinae Steinmann and Döderlein 1890
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Tr. Equini Quinn 1955 [horse]
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G. †Astrohippus Stirton 1940
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†Astrohippus ansae Matthew and Stirton 1930
†Astrohippus stockii Lance 1950
G. †Calippus Matthew and Stirton 1930
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†Calippus cerasinus Hulbert, Jr. 1988
†Calippus circulus Quinn 1955
†Calippus elachistus Hulbert, Jr. 1988
†Calippus maccartyi Hulbert, Jr. 1988
†Calippus regulus Johnston 1937
G. †Dinohippus Quinn 1955
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†Dinohippus edensis Frick 1921
†Dinohippus interpolatus Cope 1893
†Dinohippus leidyanus Osborn 1918
†Dinohippus mexicanus Lance 1950
†Dinohippus osborni Frick 1921
†Dinohippus pachyops Cope 1893
†Dinohippus subvenus Quinn 1955
G. Equus Linnaeus 1758 [horse]
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†Equus scotti Gidley 1900
Invalid names: Plesippus Matthew 1924 [synonym]
G. †Hippidion Owen 1869
G. †Pliohippus Marsh 1874
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†Pliohippus bakeri Azzaroli 1988
†Pliohippus coalingensis Merriam 1914
†Pliohippus fairbanksi Merriam 1915
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Invalid names: Pliohippus leardi Drescher 1941 [synonym], Pliohippus tantalus Merriam 1913 [synonym], Pliohippus tehonensis Merriam 1915 [synonym]
†Pliohippus fossulatus Cope 1893
†Pliohippus nobilis Osborn 1918
†Pliohippus pernix Marsh 1874
†Pliohippus spectans Cope 1880
G. †Protohippus Leidy 1858
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†Protohippus gidleyi Hulbert, Jr. 1988
†Protohippus perditus Leidy 1858
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Invalid names: Eoequus wilsoni Quinn 1955 [synonym], Protohippus profectus Cope 1889 [synonym]
†Protohippus supremus Leidy 1869
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Invalid names: Hippotigris sellardsi Quinn 1955 [synonym], Protohippus simus Gidley 1906 [synonym]
†Protohippus vetus Quinn 1955
Invalid names: Eoequus Quinn 1955 [synonym]
Tr. †Hipparionini Quinn 1955 [hipparionine horse]
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G. †Cormohipparion Skinner and MacFadden 1977
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†Cormohipparion emsliei Hulbert, Jr. 1988
†Cormohipparion plicatile Leidy 1887
†Cormohipparion sphenodus Cope 1889
G. †Hipparion de Christol 1832
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†Hipparion forcei Richey 1948
†Hipparion shirleyae MacFadden 1984
Invalid names: Hippotherium Kaup 1832 [synonym]
G. †Nannippus Matthew 1926
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†Nannippus beckensis Dalquest and Donovan 1973
†Nannippus ingenuus Leidy 1885
†Nannippus morgani Hulbert, Jr. 1993
†Nannippus peninsulatus Cope 1885
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Invalid names: Nannippus hesperides Mooser 1968 [synonym], Nannippus montezumae Leidy 1882 [synonym], Nannippus phlegon Hay 1899 [synonym]
†Nannippus westoni Simpson 1930
G. †Neohipparion Gidley 1903
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†Neohipparion affine Leidy 1869
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Invalid names: Hippotherium speciosum Leidy 1854 [synonym], Neohipparion dolichops Gidley 1906 [synonym], Neohipparion whitneyi Gidley 1903 [synonym]
†Neohipparion eurystyle Cope 1893
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Invalid names: Hesperohipparion stirtoni Dalquest 1981 [synonym], Neohipparion arellanoi Stirton 1955 [synonym], Neohipparion floresi Stirton 1955 [synonym], Neohipparion molle Merriam 1915 [synonym], Neohipparion monias Mooser 1963 [synonym], Neohipparion phosphorum Simpson 1930 [synonym]
†Neohipparion gidleyi Merriam 1915
†Neohipparion leptode Merriam 1915
†Neohipparion trampasense Edwards 1982
Invalid names: Hesperohipparion Dalquest 1981 [synonym]
G. †Pseudhipparion Ameghino 1904
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†Pseudhipparion curtivallum Quinn 1955
†Pseudhipparion gratum Leidy 1869
†Pseudhipparion hessei Webb and Hulbert, Jr. 1986
†Pseudhipparion retrusum Cope 1889
†Pseudhipparion simpsoni Webb and Hulbert, Jr. 1986
†Pseudhipparion skinneri Webb and Hulbert, Jr. 1986
Invalid names: Griphippus Quinn 1955 [synonym]
G. †Merychippus Leidy 1856
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†Merychippus brevidontus Bode 1935
†Merychippus calamarius Cope 1875
†Merychippus californicus Merriam 1915
†Merychippus carrizoensis Dougherty 1940
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Invalid names: Merychippus tehachapiensis Buwalda and Lewis 1955 [synonym]
†Merychippus goorisi MacFadden and Skinner 1981
†Merychippus gunteri Simpson 1930
†Merychippus insignis Leidy 1856
†Merychippus intermontanus Merriam 1915
†Merychippus isonesus Cope 1889
†Merychippus primus Osborn 1918
†Merychippus relictus Cope 1889
†Merychippus republicanus Osborn 1918
†Merychippus sejunctus Cope 1874
†Merychippus seversus Cope 1878
†Merychippus stylodontus Merriam 1919
†Merychippus tertius Osborn 1918
Subfm. †Hyracotheriinae Cope 1881
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G. †Epihippus Marsh 1878
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†Epihippus gracilis Marsh 1871
†Epihippus intermedius Peterson 1932
†Epihippus uintensis Marsh 1875
Invalid names: Duchesnehippus Peterson 1932 [synonym]
G. †Hyracotherium Owen 1841
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†Hyracotherium aemulor Gingerich 1991
†Hyracotherium angustidens Cope 1875
†Hyracotherium cristatum Wortman 1896
†Hyracotherium grangeri Gingerich 1989
†Hyracotherium index Cope 1873
†Hyracotherium pernix Marsh 1876
†Hyracotherium sandrae Gingerich 1989
†Hyracotherium seekinsi Morris 1968
†Hyracotherium tapirinum Cope 1875
†Hyracotherium vasacciense Cope 1872
Invalid names: Eohippus Marsh 1876 [synonym]
G. †Orohippus Marsh 1872
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†Orohippus agilis Marsh 1873
†Orohippus major Marsh 1874
†Orohippus progressus Granger 1908
†Orohippus proteros Korth and Evander 1982
†Orohippus pumilus Marsh 1871
†Orohippus sylvaticus Leidy 1870
G. †Xenicohippus Bown and Kihm 1981
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†Xenicohippus grangeri Bown and Kihm 1981
†Xenicohippus osborni Bown and Kihm 1981
Subg. †Equus (Dolichohippus) Heller 1912
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†Equus (Dolichohippus) simplicidens Cope 1892
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Invalid names: Equus achates Hay and Cook 1930 [synonym], Equus calobatus Troxell 1915 [synonym], Equus cumminsi Cope 1893 [synonym], Equus occidentalis Leidy 1865 [synonym], Equus pons Quinn 1958 [synonym], Equus shoshonensis Gidley 1930 [synonym], Equus tau Owen 1869 [synonym]