Classification of Gawne 1975
Fm. Geomyidae Bonaparte 1845 [pocket gopher]
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G. †Entoptychus Cope 1878
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†Entoptychus leptophrys Cope 1881
†Entoptychus lewisi Wood 1935
Invalid names: Palustrimus Wood 1935 [synonym]
G. †Proheteromys Wood 1932
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†Proheteromys cejanus Gawne 1975
†Proheteromys incohatus Reeder 1960
Invalid names: Akmaiomys Reeder 1960 [synonym]
†Pleurolicus sulcifrons Cope 1878
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Invalid names: Grangerimus oregonensis Wood 1936 [synonym], Pleurolicus copei Wood 1936 [synonym]