The tube-lipped nectar bat (Anoura fistulata) is a bat from Ecuador that was first described in 2005. The species name fistulata is derived from the Latin word fistula, meaning "tube". It refers to the bat's lower lip, which extends 3.3–4.8 mm beyond the upper lip and is rolled into a funnel shape. The exact function of the tube-lip is unknown. The bat has the longest tongue (8.5 cm) relative to its body size of any mammal. Its tongue is 150% the size of its overall body length.