The Miahuatlán cotton rat (Sigmodon planifrons) was formerly considered a rodent species in the family Cricetidae.[2] It is found only on the Pacific slope of the Sierra de Miahuatlán in the Mexican state of Oaxaca, where it lives in deciduous tropical forest.[1] The IUCN currently considers it to be conspecific with Sigmodon alleni.[3]
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