The first specimens of Anosy mouse lemur (Microcebus tanosi) were collected by biologist Rodin Rasoloarison during field work in April 2007.

Of these captured individuals, four were prepared as biological specimens, including skins, skulls, and tissue samples, with the required permits from the government of Madagascar.

[5] M. tanosi is nearly identical in appearance to the other eastern mouse lemurs, which are known for being a complex of cryptic species.

[7] The Anosy mouse lemur has only been found in the forests of Manantantely and Ivorona in southeastern Madagascar.

The team stressed the need for further field studies to determine its geographic range and population status in order to facilitate conservation.