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Zoomorphology

, Volume 109, Issue 4, pp 223–230 | Cite as

Tympana, auditory thresholds, and projection areas of tympanal nerves in singing and silent grasshoppers (Insecta, Acridoidea)

  • K. Riede
  • G. Kämper
  • I. Höfler
Article

Summary

The auditory systems of several species of singing and acoustically communicating grasshoppers, as well as of silent grasshoppers, were compared with respect to the external structure of the tympana, thresholds of the tympanal nerve response and projection areas of tympanal nerves within the metathoracic part of the ventral nerve cord. Extracellular recordings from the tympanal nerves, using suction electrodes, revealed that singing and silent grasshoppers hear within the frequency range tested, from 2 to 40 kHz. However, differences in sensitivity were observed in those silent species with tympana of modified structure. Cobalt-backfills of the tympanal nerves revealed a clearly discernible auditory neuropil in the anterior ring tract of the metathoracic ganglion in all animals. A comparison of the volumes of neuropilar areas calculated from serial sections of the entire ganglion showed a gradation: the volumes were biggest in singing species, slightly smaller in silent species with a well-developed tympanum, and smallest in the species with modified tympana. These findings support several authors who suggested that auditory organs evolved earlier than acoustic communication.

Keywords

Modify Structure Serial Section Projection Area Auditory System Nerve Cord 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • K. Riede
    • 1
  • G. Kämper
    • 1
  • I. Höfler
    • 1
  1. 1.Max-Planck-Institut für Verhaltensphysiologie Abteilung HuberSeewiesenFederal Republic of Germany

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