The Incan little mastiff bat (Mormopterus phrudus ) is a species of bat in the family Molossidae, the free-tailed bats. It belongs to the subgenus Micronomus.
Its head and body length is 50 mm (2.0 in); its tail length is 29 mm (1.1 in); its forearm length is 34 mm (1.3 in).Its fur is dark brown.Its ears are thin, rounded, and not conjoined as in some other free-tailed bats.It has a small tragus with a pointed tip and an inconspicuous antitragus.Its lips are slightly wrinkled.Males, at least, have a gular gland.Its dental formula is 1.1.2.32.1.2.3, for a total of 30 teeth.
It is only known from a very small area of occupancy of 20 km2 (7.7 sq mi).It is documented at relatively high elevations, from 1,800–3,000 m (5,900–9,800 ft) above sea level.It occurs in lowland subtropical forest.
Little is known about the biology of the bat. It has been observed roosting in caves at an altitude of 3,000 m (9,800 ft). It may be a microendemic species.
This bat is endemic to Peru, where it is known only from one location; its type locality at Machu Picchu. It is considered a vulnerable species by the International Union for Conservation of Nature (IUCN) and a critically endangered species by the nation of Peru; though it is rare, it lives in a protected area.
