Myotis vivesi

Myotis vivesi, the fish-eating bat or fish-eating myotis, is a species of bat that lives around the Gulf of California, and feeds on fish and crustaceans. It is the largest species of the genus Myotis in the Americas, and has exceptionally large feet, which it uses in hunting. It was described in 1901 by Auguste Ménégaux and is the only species in the subgenus (or genus) Pizonyx.

Description

Myotis vivesi is the largest species in the genus Myotis in the Americas, and is similar in size to the Eurasian Myotis myotis (greater mouse-eared bat). The skull averages 23 millimetres (0.91 in) in length. The second largest Myotis species in the New World, Myotis velifer, has a skull 17.6 mm (0.69 in) long, and feet 8 mm (0.31 in) long; M. vivesi has greatly elongated hind feet, which average 23 mm (0.91 in) long.

In common with other fish-eating bats, Myotis vivesi has long, efficient wings, with high aspect ratio and low wing loading, and large feet with sharp claws. The uropatagium (the wing surface between the hind legs) bears a fringe of silky hairs of unknown function; the uropatagium itself is used in hunting.