Vespertilionidae Gray, 1821

Velazco, Paúl M. & Patterson, Bruce D., 2019, Small Mammals Of The Mayo River Basin In Northern Peru, With The Description Of A New Species Of Sturnira (Chiroptera: Phyllostomidae), Bulletin of the American Museum of Natural History 2019 (429), pp. 1-69 : 43

Family Vespertilionidae Gray, 1821

Vespertilionidae is the most speciose family in Chiroptera , with a nearly cosmopolitan distribution except in the Arctic and Antarctica. Vespertilionids are characterized by the reduction of the second digit of the wing to the metacarpal and a single small phalanx and the presence of a long tail, reaching the edge of the uropatagium ( Koopman, 1994). Two species of Myotis were recorded in one locality during our study.