Allen's big-eared bat

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Allen's big-eared bat
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Chiroptera
Family: Vespertilionidae
Genus: Idionycteris
Anthony, 1923
I. phyllotis
Binomial name
Idionycteris phyllotis
Idionycteris phyllotis map.svg

Allen's big-eared bat (Idionycteris phyllotis) is a species of vesper bat in the monotypic genus Idionycteris. It occurs in Mexico and in Arizona, California, Nevada, New Mexico, Utah, and Colorado[2] in the United States.[1]


Idionycteris is a bat with large ears, weighing 8 to 16 grams. On the dorsal side they possess long and soft pelage,[3] also referred to as fur. Their fur is basally blackish in color with tips that are a yellow-gray color. Idionycteris, has a black patch on each shoulder, a tuft of white hair on the backside of the ears, as well as, ventral hairs that are black with pale tips.[3] The calcar possesses a low keel. The uropatagium has 12 to 13 transverse ribs. The rostrum is flattened and broad.[3]

Idionycteris phyllotis has an external morphology like that of gleaning bats, which means they have adaptions required for plucking stationary insects from surfaces.[3] To do this, they have long tragi and ears, wings adapted for maneuverability and hovering flight, and a gracile jaw.[3] Allen’s big-eared bat (Idionycteris phyllotis) is the only species in North America known to emit long, constant frequency-frequency modulated echolocation calls.[2]

Range and habitat[edit]

The Allen’s big-eared bat inhabits the southwestern mountainous regions of Mexico and the United States. This species, occupies a wider range in elevation, ranging from 855 m to 3,225 m, while most specimens reside at altitudes between 1,100 m and 2,500 m.[3]


  1. ^ a b Arroyo-Cabrales, J. & Ticul Alvarez Castaneda, S. (2008). "Idionycteris phyllotis". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved 7 February 2010.
  2. ^ a b Hayes, M. A., et al. (2009). Allen's big-eared bat (Idionycteris phyllotis) documented in Colorado based on recordings of its distinctive echolocation call. Archived 2016-03-04 at the Wayback Machine The Southwestern Naturalist 54(4), 499-501.
  3. ^ a b c d e f Czaplewski, Nicholas J. (1983-12-15). "Idionycteris phyllotis". Mammalian Species (208): 1–4. doi:10.2307/3503999. ISSN 0076-3519.