hairy-eared Cerrado mouse

The hairy-eared cerrado mouse has a head-and-body length of less than 90 mm (3.5 in) and is generally smaller than the only other species in the genus, the cerrado mouse (Thalpomys cerradensis). The two are similar in appearance, but the hairy-eared mouse has a more intense colour and longer, more lax fur. The dorsal pelage is reddish-brown, the individual hairs having blackish bases, orange central sections and blackish tips. There are also longer black guard hairs. The flanks and underparts are paler. The chin is buff and the eye-ring and cheeks orangish. The tail is brown above and pale beneath. The diploid number is 38.

This mouse is restricted to the cerrado ecoregion in Brazil, occurring in the states of Bahia, Minas Gerais, Rondônia and São Paulo, and the Federal District. It inhabits various types of open grassland, with or without scrub, bushes and scattered trees, and wetter grassland areas.

The hairy-eared cerrado mouse breeds in the dry season in some areas and in the wet season in others. Litter sizes of two and three have been recorded. The home range averages 2,278 m2 (24,500 sq ft) and it is the second most abundant rodent in the cerrado after the hairy-tailed bolo mouse (Necromys lasiurus).