The simple dental formula of a bat species in the genus Myotis is 2.1.3.33.1.3.3, for a total of 38 teeth.

The calcar is long, extending about 60% of the distance from the ankle to the tail, and, unlike that of many other North American species of Myotis, lacks a keel.

[2] It is similar to Myotis occultus,[3] but most closely resembles the little brown bat, from which it can only be distinguished through the examination of a number of different features considered together.

[1] It is found in a variety of western lowland habitats, from arid thorn scrub to coniferous forest, but always close to standing water such as lakes and ponds.

[5] When not close to a body of water, the Yuma Myotis can be found in the thousands roosting in caves, attics, buildings, mines, underneath bridges, and other similar structures.

[11] Although their natural roosts include caves, rock crevices, and hollow trees, they are more commonly found today in artificial structures close to water.