The auditory system of non-calling grasshoppers (Melanoplinae: Podismini) and the evolutionary regression of their tympanal ears

  title={The auditory system of non-calling grasshoppers (Melanoplinae: Podismini) and the evolutionary regression of their tympanal ears},
  author={Gerlind U. C. Lehmann and Sandra Berger and Johannes Strau{\ss} and Arne W Lehmann and Hans-Joachim Pfl{\"u}ger},
  journal={Journal of Comparative Physiology A},
Reduction of tympanal hearing organs is repeatedly found amongst insects and is associated with weakened selection for hearing. There is also an associated wing reduction, since flight is no longer required to evade bats. Wing reduction may also affect sound production. Here, the auditory system in four silent grasshopper species belonging to the Podismini is investigated. In this group, tympanal ears occur but sound signalling does not. The tympanal organs range from fully developed to… 
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The Auditory System of an Atympanate Bushcricket Phasmodes Ranatriformes (Westwood) (Tettigoniidae: Orthoptera)
The two possibilities either that this animal shows a secondary reduction of the auditory system or that it represents a primitive form are discussed, and developmental data from other tettigoniids seem to confirm the latter hypothesis.
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  • Meyer, Elsner
  • Biology
    The Journal of experimental biology
  • 1996
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There must have been stabilizing selective forces at work that conserved coding characteristics and prevented an adaptation of the thoracic auditory pathway to the specific needs of acoustic communication, according to the ‘efficient coding’ hypothesis.
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