Classification of McGrew 1941

Fm. †Allomyidae Marsh 1877
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G. †Allomys Marsh 1877
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Allomys cavatus Cope 1881
Allomys nitens Marsh 1877
G. †Haplomys Miller and Gidley 1918
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Haplomys liolophus Cope 1881
Fm. Aplodontidae Brandt 1855 [mountain beaver]
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G. †Meniscomys Cope 1878
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Meniscomys hippodus Cope 1878
Invalid names: Protogaulus Riggs 1899 [synonym]
Fm. †Mylagaulidae Cope 1881
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G. †Mylagaulodon Sinclair 1903
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Mylagaulodon angulatus Sinclair 1903