 Argentine brown bats have distinctive; husky bodies, a large broad head, with short round ears.This species of bat differ from other species of the same family because their average body size is larger than "E. diminutus" but they are smaller than both "E. basillensis" and "E.fuscus".One of the main defining characteristics is that Argentine brown bats maxillary tooth row differ in length compared to other species in that their average maxillary tooth-row length is between 5.4 and 6.3 mm in length.