Classification of Matthew 1910
Fm. †Ischyromyidae Alston 1876
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G. †Prosciurus Matthew 1903
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†Prosciurus relictus Cope 1873
†Prosciurus vetustus Matthew 1903
†Prosciurus vortmani Cope 1879
G. †Ischyromys Leidy 1856
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Invalid names: Colotaxis Cope 1873 [synonym], Gymnoptychus Cope 1873 [synonym]
G. †Paramys Leidy 1871
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Subg. †Paramys (Ischyrotomus) Matthew 1910
Subg. †Paramys (Pseudotomus) Cope 1872
†Paramys buccatus Cope 1877
†Paramys sciuroides Scott and Osborn 1887
Invalid names: Plesiarctomys Bravard 1848 [synonym]
Fm. †Sciuravidae Miller and Gidley 1918
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