Classification of Martin 1974
Fm. Cricetidae Fischer von Waldheim 1817
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G. Pitymys McMurtrie 1831
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†Pitymys aratai Martin 1974
†Pitymys dideltus Cope 1871
†Pitymys involutus Cope 1871
†Pitymys llanensis Hibbard 1944
Pitymys ochrogaster Wagner 1842 [prairie vole]
Invalid names: Pedomys Baird 1858 [synonym]
Canis lupus Linnaeus 1758 [gray wolf]
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Invalid names: Canis armbrusteri Gidley 1913 [synonym], Canis furlongi Hay 1927 [synonym], Canis milleri Merriam 1912 [synonym], Canis occidentalis Richardson 1829 [synonym]
G. †Neodon
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†Neodon paroperarius Hibbard 1944
Invalid names: Arvicola speothen Cope 1871 [synonym]
G. †Phaiomys Blyth 1863
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†Phaiomys pliocaenicus Kormos 1932
Invalid names: Allophaiomys Kormos 1932 [synonym]
†Sigmodon medius Gidley 1922
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Invalid names: Sigmodon intermedius Hibbard 1937 [synonym]
†Sigmodon minor Gidley 1922
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Invalid names: Sigmodon hilli Hibbard 1941 [synonym]