Classification of Engesser 1979
G. †Pseudotrimylus Gureev 1971
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†Pseudotrimylus compressus Galbreath 1953
†Pseudotrimylus dakotensis Repenning 1967
†Pseudotrimylus mawbyi Repenning 1967
†Pseudotrimylus roperi Wilson 1960
Invalid names: Heterosorex Gaillard 1915 [synonym], Trimylus Roger 1885 [synonym]
Fm. Sciuridae Gray 1821 [squirrel]
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G. †Petauristodon Engesser 1979
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†Petauristodon jamesi Lindsay 1972
†Petauristodon mathewsi James 1963
†Petauristodon minimus Lindsay 1972
†Petauristodon uphami James 1963
G. †Leptodontomys Shotwell 1956
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†Leptodontomys quartzi Shotwell 1967
†Leptodontomys russelli Storer 1970
†Leptodontomys stirtoni Lindsay 1972
Invalid names: Pseudadjidaumo Lindsay 1972 [synonym]
Fm. Zapodidae Coues 1875 [jumping mouse]
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G. †Schaubeumys Wood 1935
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†Schaubeumys clivosus Galbreath 1953
†Schaubeumys galbreathi Wilson 1960
†Schaubeumys grangeri Wood 1935
†Schaubeumys sabrae Black 1958
G. †Leidymys Wood 1936
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†Leidymys alicae Black 1961
†Leidymys vetus Wood 1937
Invalid names: Cotimus Black 1961 [synonym]