Classification of the genus Merychippus

G. †Merychippus Leidy 1856
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Subg. †Merychippus (Merychippus) Stirton 1940
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Invalid names: Merychippus (Merychippus) coalingensis Clark 1921 [nomen nudum]
Subg. †Merychippus (Protohippus) Leidy 1858
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†Merychippus californicus Merriam 1915
†Merychippus coloradense Osborn 1918
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Invalid names: Hipparion sanfondensis Frick 1933 [synonym]
†Merychippus eohipparion Osborn 1918
†Merychippus eoplacidus Osborn 1918
†Merychippus gunteri Simpson 1930
†Merychippus insignis Leidy 1856
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Invalid names: Merychippus paniensis Cope 1874 [synonym]
†Merychippus labrosus Cope 1874
†Merychippus missouriensis Douglass 1908
†Merychippus patruus Osborn 1918
†Merychippus primus Osborn 1918
†Merychippus proparvulus Osborn 1918
†Merychippus quintus Osborn 1918
†Merychippus relictus Cope 1889
†Merychippus republicanus Osborn 1918
†Merychippus sejunctus Cope 1874
†Merychippus seversus Cope 1878
†Merychippus stevensi Dougherty 1940
Invalid names: Merychippus isonesus secundus Osborn 1918 [nomen vanum], Merychippus quartus Osborn 1918 [nomen vanum]