[4] The ears are long and pointed, with sharp serrations along the medial edges and a spatulate tragus including a shelf-like fold.

The upper lip has a number of heavy bristles and surrounds the nose, with numerous folds and small projections along its edge.

[5] The wing membranes reach the ankles of the bat, which are also attached to a large uropatagium, with the short tail emerging near the middle of the upper surface.

Because of the small size of Wagner's mustached bat, however, it does not fly as quickly as other related species with a similar wing shape; flight speeds between 10 and 19.6 km/h (6.2 and 12.2 mph) have been recorded.

[6] Females come into estrus once a year, and give birth to a single young near the beginning of the rainy season in June or July.

[4] There are two recognised subspecies: Fossils of Wagner's mustached bat have been found on Tobago, indicating that it may once have had a wider range than it has today.