Microcebus mittermeieri is the smallest mouse lemur in Madagascar’s eastern rain forests, and indeed ranks with M. myoxinus and M. berthae in body size. The head-body length is just 8 cm, with a 12 cm tail, a total length of about 20 cm, and an average adult weight of just over 40 g (Louis et al., 2006a). The head and dorsal coat are light reddish- brown to rust, with an orange tint at the base of the forelimbs and hindlimbs, while the ventral coat is whitish-brown. The tail is brown above with a darker brown mid-dorsal stripe and a black tip. A distinctive white patch extends along the rostrum past the level of its eyes, which are underlined with yellow. The latter coloration is also present under the chin and extends along the ventral aspect of the neck. According to Louis et al. (2006a), the overall color is lighter than that of M. rufus.
This species has not been studied in the wild.
Northeastern Madagascar. This species occurs in and around the Anjanaharibe-Sud Special Reserve (Louis et al., 2006a), and is known to be sympatric with M. macarthurii over some of its range (Radespiel et al., 2008).
The most recent IUCN Red List assessment (2008) classified M. mittermeieri as Data Deficient (DD). The only protected area in which it is known to occur is the Anjanaharibe-Sud Special Reserve.
As of 2009, there were four individuals of this species in captivity, all in the Tsimbazaza Zoo in Antananarivo (E. E. Louis Jr., pers. obs.).
Excursions to Anjanaharibe-Sud can be arranged in advance through Sambava Voyages, a local tour operator in Sambava that also organizes trips to Marojejy National Park. Anjanaharibe-Sud can be reached by car from Andapa, but finding this species requires hiking well into the reserve and camping overnight in the forest.