Classification of Hulbert, Jr. and MacFadden 1991
G. †Merychippus Leidy 1856
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†Merychippus gunteri Simpson 1930
†Merychippus isonesus Cope 1889
†Merychippus tertius Osborn 1918
G. †Parahippus Leidy 1858
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†Parahippus leonensis Sellards 1916
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Invalid names: Merychippus socius Hay 1924 [synonym], Merychippus vellicans Hay 1924 [synonym], Parahippus barbouri White 1942 [synonym]
†Merychippus carrizoensis Dougherty 1940
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Invalid names: Merychippus tehachapiensis Buwalda and Lewis 1955 [synonym]