The Brazilian big-eyed bat is small, with a total length of 7 to 8 centimetres (2.8 to 3.1 in), and weighing 27 to 33 grams (0.95 to 1.16 oz).

[2] Compared with most of its close relatives, the Brazilian big-eyed bat has few teeth, having a dental formula of 2.1.2.22.1.2.2.

[4] The Brazilian big-eyed bat is found in eastern Brazil, from Pernambuco to Parana, and inland to Goias and Mato Grosso do Sul.

While it may prefer tropical rainforest, the bat is found in a range of forested environments and small wooded areas, including agricultural land and parks.

Young bats are somewhat more greyish than the adults and lack the distinct facial markings, although the stripe down the back is present from birth.