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Argentine fat-tailed mouse opossum
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Didelphimorphia
Family: Didelphidae
Genus: Thylamys
Species: T. sponsorius
Binomial name
Thylamys sponsorius
Thomas, 1921

The Argentine fat-tailed mouse opossum (Thylamys sponsorius) is a species of opossum in the Didelphidae family. It is found in the eastern foothills of the Andes in northern Argentina and southern Bolivia.[1] Its dorsal fur is gray brown to dark brown. Its ventral fur is gray-based except for the self-colored white to yellowish chest hairs. It is separated from Thylamys Cinderella by its postorbital ridges. Thylamys Cinderella has well-developed postorbital ridges in both juveniles and adults that extend laterally behind the eye sockets. Only adults of Thylamys Sponsorius have fully-developed postorbital ridges, and these do not extend laterally behind the eye sockets.[2]


  1. ^ a b Diaz M. & Barquez, R. (2008). Thylamys sponsorius. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 20 March 2009.
  2. ^ Gardner, Alfred L. (2008). Mammals of South America: Marsupials, xenarthrans, shrews, and bats. University of Chicago Press. pp. 669. ISBN 0226282406. 


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