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HOME --> CLASS MAMMALIA  --> ORDER RODENTIA  --> SUBORDER MYOMORPHA  --> SUPERFAMILY Muroidea  --> FAMILY Cricetidae  --> SUBFAMILY Sigmodontinae  --> GENUS Sigmodon  --> SUBGENUS Sigmomys

SPECIES Sigmodon (Sigmomys) alstoni

Author:Thomas, 1880.
Actual Date:1881
Citation:Proc. Zool. Soc. Lond., 1880: 691.
Common Name:Alston’s Cotton Rat
Type Locality:Venezuela, Sucre State, Cumaná.
Distribution:Intermittently distributed in savannas over NE Colombia, N and E Venezuela, Guyana, Surinam, and N Brazil (regional aspects of range amplified by Husson, 1978; Linares, 1998; and Voss, 1992).
Status:IUCN – Lower Risk (lc).
Comments:Subgenus Sigmomys. Suspected to be "individuals of South American representatives of S. hispidus with grooved incisors" (Hershkovitz, 1955a:647), but distantly related to other species of Sigmodon according to phylogenetic interpretation of cytochrome b sequences (Peppers and Bradley, 2000; Peppers et al., 2002). Voss (1992) discerned no morphological or morphometric foundation for delineating subspecies, but Linares (1998) recognized savannarum and venester, along with the nominate form, as races for Venezuelan populations.



    savannarum (Thomas, 1901)
    venester (Thomas, 1914)

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