Classification of the genus Sigmodon

G. Sigmodon Say and Ord 1825 [cotton rat]
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Sigmodon alstoni Thomas 1880
†Sigmodon bakeri Martin 1974
Sigmodon chonensis Allen 1913
†Sigmodon curtisi Gidley 1922
Sigmodon hispidus Say and Ord 1825 [hispid cotton rat]
†Sigmodon hudspethensis Strain 1966
†Sigmodon libitinus Martin 1979
†Sigmodon lindsayi Martin and Prince 1989
†Sigmodon minor Gidley 1922
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Invalid names: Sigmodon intermedius Hibbard 1937 [synonym], Sigmodon medius Gidley 1922 [synonym]