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BRAZILIAN BROWN BAT Eptesicus brasiliensis
Bats of the genus Eptesicus are insectivores that belong to the family Vespertilionidae, aptly known as the "Brown Bats". Identification to species level is extremely difficult and requires careful measurement and comparison of morphological characters. Eptesicus bats can be distinguished from the extremely similar Myotis bats by the presence of a single premolar and unequal incisors - difficult to observe in a live specimen without getting your fingers dangerously close to those biting teeth! A little easier to note is that the tail of Eptesicus juts out of the uropatagium at the extreme tip, whereas that of Myotis is completely enclosed within the uropatagium.
Click on the images to enlarge them.
FIGURE 1 - (PMAM195PH) Adult specimen, Ruta Trans-Chaco km650 (Paul Smith July).
FIGURE 2 - (PMAM196PH) Upperside of same specimen (Paul Smith July).
FIGURE 1

FIGURE 1
FIGURE 2

FIGURE 2