Marmosa(Site not responding. Last check: 2007-11-04)
Hopefully they are mostly correct - some people tend to guess "Marmosa" for many small opossums, so these may not be quite right.
The smallest of the 9 Marmosa opossum species have a head and body length of 3.35" inches, while the larger species can measure up to 7.28" inches long.
Research by Cynthia Steiner and François M. Catzeflisa indicates there might be two sub-species of Marmosamurina in French Guyana, one a lighter color and the other darker.
So if you come across it online, please be careful when reading it and realize the details are not accurate.
The care sheet lists and describes the opossum "Marmosamurina", but the opossums she sells are "Thylamys pusilla" that are only distant cousins, very different sizes, live in different areas and have different diets and nesting behaviors.
She has removed it from her own website but it still circulates on the internet.
lepida [Marmosa lepida] (little rufous mouse opossum) -- M.
Voss, R. S., Gardner, A. and Jansa, S. A., 2004: On the relationships of “Marmosa” formosa Shamel, 1930 (Marsupialia: Didelphidae), a phylogenetic puzzle from the Chaco of northern Argentina.