The Cinderella fat-tailed mouse opossum (Thylamys cinderella) is a species of opossum in the family Didelphidae.[2] It is found in northern Argentina and southern Bolivia, in the eastern foothills of the Andes.[1] Its dorsal fur is gray brown to dark brown. Its ventral fur is gray-based, except for the white to yellowish chest hairs. It has been distinguished from T. sponsorius by the well-developed postorbital ridges of the latter,[3] but mitochondrial DNA sequence analysis does not support separate species status for sponsorius.[1][4]
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