The Paraguayan fat-tailed mouse opossum (''Thylamys macrurus'') is a species of opossum in the family Didelphidae. It is found in forested areas of Brazil and Paraguay.

Description

It is known only from a few specimens. For two listed specimens, one had a head-and-body length of about 135 mm and a tail length of about 140 mm, while the other had a head-and-body length of about 120 mm and a tail length of about 155 mm. Most of its fur is gray, but the shoulder areas are reddish gray, and the ventral fur is pure white or creamy white. There is also a ring of black fur surrounding each eye. The ventral surface of the tail is white. The

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage The fus ...

surface of the tail is gray for the first one third to one half of its length (going from the base to the tip); the remainder of the

surface of the tail is white. The tail is hairless except for about its first ten mm (going from the base to the tip). Although the genus Thylamys is characterized by fat storage in the tail, there is no evidence that this species stores fat in its tail.

References

Opossums Marsupials of Brazil Mammals of Paraguay Near threatened animals Near threatened biota of South America Mammals described in 1818 Taxa named by Ignaz von Olfers Taxonomy articles created by Polbot {{marsupial-stub