The proboscis bat (Rhynchonycteris naso) is a bat species from South and Central America. Other common names include Long-nosed proboscis bat, sharp-nosed bat, Brazilian long-nosed bat and river bat in English, and murciélago narizón in Spanish. It is monotypic within its genus.This species is in the family Emballonuridae, the sac-winged or sheath-tailed bats. Like most bats, it is nocturnal. It is found from southern Mexico to Peru, Bolivia and Brazil, as well as in Trinidad.