Classification of Wood 1962
Fm. †Ischyromyidae Alston 1876
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G. †Lophiparamys Wood 1962
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†Lophiparamys debequensis Wood 1962
†Lophiparamys murinus Matthew 1918
G. †Ischyrotomus Matthew 1910
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†Ischyrotomus compressidens Peterson 1919
†Ischyrotomus horribilis Wood 1962
†Ischyrotomus oweni Wood 1962
†Ischyrotomus petersoni Matthew 1910
†Ischyrotomus superbus Osborn et al. 1878
G. †Leptotomus Matthew 1910
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†Leptotomus bridgerensis Wood 1962
†Leptotomus costilloi Wood 1962
†Leptotomus grandis Wood 1962
†Leptotomus huerfanensis Wood 1962
†Leptotomus loomisi Wood 1962
†Leptotomus mytonensis Wood 1962
†Leptotomus sciuroides Scott and Osborn 1887
G. †Microparamys Wood 1959
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†Microparamys cathedralis Wood 1962
†Microparamys lysitensis Wood 1962
†Microparamys minutus Wilson 1937
†Microparamys tricus Wilson 1940
†Microparamys wilsoni Wood 1962
G. †Mytonomys Wood 1956
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†Mytonomys burkei Wilson 1940
†Mytonomys robustus Peterson 1919
G. †Paramys Leidy 1871
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†Paramys delicatior Leidy 1871
†Paramys francesi Wood 1962
†Paramys huerfanensis Wood 1962
†Paramys wortmani Wood 1962
G. †Thisbemys Wood 1959
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†Thisbemys medius Peterson 1919
†Thisbemys nini Wood 1962
†Thisbemys perditus Wood 1962
†Thisbemys plicatus Wood 1962
†Thisbemys uintensis Osborn 1895
G. †Prosciurus Matthew 1903
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†Prosciurus relictus Cope 1873
†Prosciurus saskatchewaensis Lambe 1908
Fm. †Reithroparamyidae Wood 1962
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G. †Reithroparamys Matthew 1920
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†Reithroparamys atwateri Loomis 1907
†Reithroparamys debequensis Wood 1962
†Reithroparamys delicatissimus Leidy 1871
†Reithroparamys gidleyi Peterson 1919
†Reithroparamys huerfanensis Wood 1962
†Reithroparamys matthewi Wood 1962
†Reithroparamys pattersoni Wood 1962
†Paramys copei Loomis 1907
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Invalid names: Paramys bicuspis Loomis 1907 [synonym], Paramys major Loomis 1907 [synonym], Paramys primaevus Loomis 1907 [synonym], Paramys quadratus Loomis 1907 [synonym]
Fm. †Paramyidae Miller and Gidley 1918
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Subfm. †Manitshinae Simpson
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G. †Pseudotomus Cope 1872
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†Pseudotomus coloradensis Wood 1962
†Pseudotomus hians Cope 1872
†Pseudotomus robustus Marsh 1872
Subg. †Sciurus (Prosciurus) Matthew 1903
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†Sciurus (Prosciurus) vetustus Matthew 1903