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Understanding the distribution of the common big-eared bat  Micronycteris microtis  has been constrained by difficulties in mapping characters that securely differentiate it from its congener,  Micronycteris megalotis . We studied individuals of dark-bellied  Micronycteris  from several localities in northern and southeastern Brazil and tested the consistency of characters traditionally used in their differentiation. Characters that separate  M.  microtis  from  M.  megalotis  are the ear length, the fur at the leading edge of the pinna length, and the dorsal fur length. On the basis of our revised identifications, we confirm the occurrence of  M. microtis  in southeastern Brazil, and provide new records from localities nested in the Cerrado/Atlantic forest transition area of the state of Minas Gerais, and in the Amazonian forests of the northeastern and northwestern, states of Pará and Rondônia.  M. microtis  is now known to occur sympatrically with  M. megalotis  in four Amazonian localities.  M. microtis  used iron ore caves from Carajás, Pará, northern Brazil, and the Serra da Moeda and Serra do Rola Moça State Park, Minas Gerais, southern Brazil, whereas sympatric  M. megalotis  did not in both locations. Moreover,  M. microtis  from the lower Xingu River used small caves formed by rock outcrops to roost.

Distribution and taxonomy of the common big-eared bat Micronycteris microtis (Chiroptera: Phyllostomidae) in South America