Classification of Kelly 1995

Fm. Equidae Gray 1821 [horse]
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Subfm. Equinae Steinmann and Döderlein 1890
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G. †Acritohippus Kelly 1995
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Acritohippus isonesus Cope 1889
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Invalid names: Merychippus praecocidens Russell 1933 [synonym]
Acritohippus quinni Kelly 1995
Acritohippus tertius Osborn 1918
Tr. Equini Quinn 1955 [horse]
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G. †Astrohippus Stirton 1940
G. †Dinohippus Quinn 1955
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Dinohippus leidyanus Osborn 1918
Dinohippus spectans Cope 1880
G. Equus Linnaeus 1758 [horse]
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Equus cumminsii Cope 1893
Equus simplicidens Cope 1892
Invalid names: Plesippus Matthew 1924 [synonym]
G. †Heteropliohippus Kelly 1995
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G. †Hippidion Owen 1869
G. †Onohippidium Moreno 1891
G. †Parapliohippus Kelly 1995
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Parapliohippus carrizoensis Dougherty 1940
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Invalid names: Merychippus tehachapiensis Buwalda and Lewis 1955 [synonym]
G. †Pliohippus Marsh 1874
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Pliohippus fossulatus Cope 1893
Pliohippus mirabilis Leidy 1858
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Invalid names: Merychippus campestris Gidley 1907 [synonym]
Pliohippus pernix Marsh 1874
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Invalid names: Pliohippus lullianus Troxell 1916 [synonym], Pliohippus robustus Marsh 1874 [synonym], Protohippus pachyops Cope 1893 [synonym]
Pliohippus tantalus Merriam 1913
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Invalid names: Pliohippus fairbanksi Merriam 1915 [synonym]
Invalid names: Pliohippus tehonensis Merriam 1915 [nomen dubium]
Tr. †Hipparionini Quinn 1955 [hipparionine horse]
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G. †Cormohipparion Skinner and MacFadden 1977
G. †Hipparion de Christol 1832
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Hipparion shirleyae MacFadden 1984
Hipparion tehonense Merriam 1916
G. †Merychippus Leidy 1856
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Merychippus californicus Merriam 1915
Merychippus coloradense Osborn 1918
Merychippus goorisi MacFadden and Skinner 1981
Merychippus gunteri Simpson 1930
Merychippus insignis Leidy 1856
Merychippus intermontanus Merriam 1915
Merychippus primus Osborn 1918
Merychippus quintus Osborn 1918
Merychippus sejunctus Cope 1874
Merychippus stylodontus Merriam 1919
G. †Nannippus Matthew 1926
G. †Neohipparion Gidley 1903
G. †Pseudhipparion Ameghino 1904
Invalid names: Protohippini Quinn 1955 [empty], Stylonus Cope 1878 [nomen dubium], Stylonus seversus Cope 1878 [nomen dubium]