1. Hoja nasal presente, bien desarrollada y triangular o rudimentaria y
redondeada / Nose leaf present, well developed and triangular or
rudimentary and rounded -----------------------------------------Phyllostomidae
1’. Sin hoja nasal/Nose leaf absent-------------------------------------------------------2
2. Cola sobrepasa el borde del uropatagio con una porción libre / Tail
extended beyond the edge of the uropatagium------------------Molossidae
2’. Cola total o casi totalmente incluida en el uropatagio / Tail entirely or
almost entirely included within the uropatagium-----------------------------3
3. Cola corta, perfora el uropatagio y la punta aparece dorsalmente; labio
superior hendido, formando un labio leporino; orejas largas, estrechas
y puntiagudas / Tail short, included in the uropatagium but tip appearing
on the dorsal surface; upper lip with a pronounced vertical groove or fold;
ears long, narrow and pointed---------------------------------------Noctilionidae
3’. Cola completamente incluida en el uropatagio; labio superior no hendido;
orejas no tan estrechas ni puntiagudas / Tail entirely enclosed within the
uropatagium; upper lip without groove; ears not too narrow nor pointed -
---------------------------------------------------------------------------- Vespertilionidae