A bony connection signals laryngeal echolocation in bats.

Nature
Nina VeselkaM Brock Fenton

Abstract

Echolocation is an active form of orientation in which animals emit sounds and then listen to reflected echoes of those sounds to form images of their surroundings in their brains. Although echolocation is usually associated with bats, it is not characteristic of all bats. Most echolocating bats produce signals in the larynx, but within one family of mainly non-echolocating species (Pteropodidae), a few species use echolocation sounds produced by tongue clicks. Here we demonstrate, using data obtained from micro-computed tomography scans of 26 species (n = 35 fluid-preserved bats), that proximal articulation of the stylohyal bone (part of the mammalian hyoid apparatus) with the tympanic bone always distinguishes laryngeally echolocating bats from all other bats (that is, non-echolocating pteropodids and those that echolocate with tongue clicks). In laryngeally echolocating bats, the proximal end of the stylohyal bone directly articulates with the tympanic bone and is often fused with it. Previous research on the morphology of the stylohyal bone in the oldest known fossil bat (Onychonycteris finneyi) suggested that it did not echolocate, but our findings suggest that O. finneyi may have used laryngeal echolocation because its st...Continue Reading

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Mar 29, 2011·Die Naturwissenschaften·Anthony RavelMustapha Bensalah
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