Marinkelle's Sword-nosed Bat

It is the largest of the sword-nosed bats. Their forearms are greater than 57 mm (2.2 in). Their skulls are 25 mm (0.98 in) long. They weigh 27 g (0.95 oz). Their hair is long, at 12 mm (0.47 in). Their propatagium is hairless, and their plagiopatagium is mostly hairless, with the exception of a few short hairs. They are dark brown in color. Their nose-leafs are 36 mm (1.4 in) tall and 12 mm (0.47 in) wide. Their ears are 38 mm (1.5 in) long, and their traguses are 19 mm (0.75 in) long.

While records of this species exist in French Guiana, these are likely mistaken. This species has been confirmed in two sites in Colombia. The first-described individual was captured in a small cave in a humid forest. Subsequent individuals have been captured while foraging in open savanna habitat. Like the Fernandez's sword-nosed bat, it is also found in the Llanos. They are found in association with granite "tepui" formations in eastern Colombia. They have been found roosting in small caves with Orinoco sword-nosed bats, Seba's short-tailed bats, Yellow-throated big-eared bats, and Lesser dog-like bats, although they prefer the darkest parts of the cave.

They are insectivorous, based on stomach content analysis. Little is known about their reproductive patterns, but a pregnant female was once found in August.