Classification of Merriam and Sinclair 1907

Fm. †Allomyidae Marsh 1877
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G. †Allomys Marsh 1877
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†Allomys cavatus Cope 1881
†Allomys liolophus Cope 1881
†Allomys nitens Marsh 1877
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Invalid names: Meniscomys multiplicatus Cope 1878 [synonym]
G. †Thinohyus Marsh 1875
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†Thinohyus socialis Marsh 1875
Fm. †Hypertragulidae Cope 1879
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G. †Allomeryx Sinclair 1905
G. †Merychippus Leidy 1856
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†Merychippus relictus Cope 1889
G. †Mesohippus Marsh 1875
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†Mesohippus acutidens Sinclair 1905
†Mesohippus anceps Marsh 1874
G. †Parahippus Leidy 1858
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†Parahippus brevidens Marsh 1874
G. †Pliohippus Marsh 1874
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†Pliohippus spectans Cope 1880
G. †Protohippus Leidy 1858
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†Protohippus medius Cope 1892
G. †Colodon Marsh 1890
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†Colodon occidentalis Leidy 1868
Subg. †Miolabis (Paratylopus) Matthew 1904
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