{{Short description|Species of bat}} {{speciesbox | name = Allen's big-eared bat | image = Idionycteris phyllotis 461573.jpg | status = LC | status_system = IUCN3.1 | status_ref = <ref name="iucn status 12 November 2021">{{cite iucn |author=Arroyo-Cabrales, J. |author2=Álvarez-Castañeda, S.T. |date=2017 |title=''Idionycteris phyllotis'' |volume=2017 |article-number=e.T10790A21990019 |doi=10.2305/IUCN.UK.2017-2.RLTS.T10790A21990019.en |access-date=12 November 2021}}</ref> | genus = Idionycteris | parent_authority = Anthony, 1923 | display_parents = 2 | species = phyllotis | authority = G.M. Allen, 1916 | range_map = Idionycteris phyllotis map.svg | synonyms = }} '''Allen's big-eared bat''' ('''''Idionycteris phyllotis'''''), also known as the '''lappet-browed bat''', 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<ref name=":0">{{cite journal |first1=Mark A. |last1=Hayes |first2=Kirk W. |last2=Navo |first3=Lea R. |last3=Bonewell |first4=Cyndi J. |last4=Mosch |first5=Rick A. |last5=Adams |year=2009 |title=Allen's big-eared bat (''Idionycteris phyllotis'') documented in Colorado based on recordings of its distinctive echolocation call |journal=The Southwestern Naturalist |volume=54 |issue=4 |pages=499–501 |doi=10.1894/JKF-01.1 |bibcode=2009SWNat..54..499H }}</ref> in the United States.<ref name="iucn status 12 November 2021" />
==Description== ''Idionycteris phyllotis'' is a bat with large ears, weighing 8 to 16 grams. On the dorsal side they possess long and soft pelage,<ref name=":1">{{Cite journal|last=Czaplewski|first=Nicholas J.|date=1983-12-15|title=Idionycteris phyllotis|journal=Mammalian Species|language=en|issue=208|pages=1–4|doi=10.2307/3503999|issn=0076-3519|jstor=3503999|doi-access=free}}</ref> (fur). Their fur is basally blackish in color with tips that are a yellow-gray color. They have 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.<ref name=":1" /> The calcar possesses a low keel. The uropatagium has 12 to 13 transverse ribs. The rostrum is flattened and broad.<ref name=":1" /> They have distinctive lappets (disc-shaped protrusions), which project from the base of the ears onto the brow of the bat.<ref name="Bat Conservation International">{{cite web |title=Allen's Big-eared Bat |url=https://www.batcon.org/bat/idionycteris-phyllotis/ |website=Bat Conservation International |access-date=31 May 2024}}</ref>
''I. phyllotis'' has an external morphology common to that of gleaning bats, and are thus well adapted for plucking stationary insects from surfaces.<ref name=":1" /> To do this they have long tragi and ears, wings adapted for maneuverability and hovering flight, and a gracile jaw.<ref name=":1" /> ''I. phyllotis'') is the only species in North America known to emit long, constant frequency-frequency modulated echolocation calls.<ref name=":0" />
==Range and habitat== Allen's big-eared bat inhabits the southwestern mountainous regions of Mexico and the United States. This species occupies a wide range in elevation, ranging from 855 m to 3,225 m, though most specimens reside at altitudes between 1,100 m and 2,500 m.<ref name=":1" />
==References== {{Reflist}}
{{Vespertilionidae|V.|Pl.}} {{Taxonbar|from=Q247338}}
Category:Vespertilionidae Category:Bats of Mexico Category:Bats of the United States Bat, Allen Bat, Allen Bat, Allen Bat, Allen Bat, Allen Bat, Allen Category:Mammals described in 1916 Category:Taxa named by Glover Morrill Allen Category:Taxonomy articles created by Polbot Category:Least concern biota of the United States