The tropical big-eared brown bat has large, triangular ears. Brazilian records span several biomes, including Atlantic Forest and Cerrado.
The São Paulo study specimens had large, triangular ears. Dorsal hairs were dark brown at the base and yellowish brown at the tips; ventral hairs were dark brown at the base and grayish brown at the tips.
At one site in São Paulo state, researchers caught 13 bats in building roofs in May, July, and October. Two pregnant females were caught there in October.
An extinction-risk assessment has not been added yet.