The Cinderella fat-tailed mouse opossum (''Thylamys cinderella'') is a species of opossum in the family Didelphidae. It is found in northern

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

and southern

Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...

, in the eastern foothills of the

Andes The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the List of longest mountain chains on Earth, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range ...

. 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, but

mitochondrial DNA Mitochondrial DNA (mtDNA and mDNA) is the DNA located in the mitochondrion, mitochondria organelles in a eukaryotic cell that converts chemical energy from food into adenosine triphosphate (ATP). Mitochondrial DNA is a small portion of the D ...

sequence analysis does not support separate species status for ''sponsorius''.

References

Opossums Fauna of the Andes Marsupials of Argentina Marsupials of Bolivia Mammals described in 1902 Taxa named by Oldfield Thomas {{marsupial-stub