Classification of Hulbert, Jr. 1988

Fm. Equidae Gray 1821 [horse]
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Tr. Equini Quinn 1955 [horse]
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Subtr. †Protohippina Quinn 1955 [protohippines]
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G. †Calippus Matthew and Stirton 1930
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Subg. †Calippus (Calippus) Matthew and Stirton 1930
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Calippus (Calippus) elachistus Hulbert, Jr. 1988
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Invalid names: Calippus optimus Quinn 1955 [synonym], Merychippus francisi Hay 1924 [synonym]
Calippus (Calippus) regulus Johnston 1937
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Invalid names: Calippus anatinus Quinn 1955 [synonym]
Subg. †Calippus (Grammohippus) Hulbert, Jr. 1988
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Calippus (Grammohippus) cerasinus Hulbert, Jr. 1988
Calippus (Grammohippus) hondurensis Olson and McGrew 1941
Calippus (Grammohippus) maccartyi Hulbert, Jr. 1988
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Invalid names: Equus laparensis Quinn 1955 [synonym]
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 clarendonensis Quinn 1955 [synonym], Hippotigris parastylus Quinn 1955 [synonym], Hippotigris sellardsi Quinn 1955 [synonym], Protohippus simus Gidley 1906 [synonym]
Protohippus vetus Quinn 1955
Invalid names: Eoequus Quinn 1955 [synonym]
Pliohippus pernix Marsh 1874
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Invalid names: Dinohippus subvenus Quinn 1955 [synonym]