Journal of Comparative Physiology A

, Volume 176, Issue 5, pp 587–599 | Cite as

Characterization of auditory afferents in the tiger beetle,Cicindela marutha Dow

  • David D. Yager
  • Hayward G. Spangler
Original Paper

Abstract

We have identified a nerve carrying auditory afferents and characterized their physiological responses in the tiger beetle,Cicindela marutha.
  1. 1.

    The tympana are located at the lateral margins of the first abdominal tergum. The nerve carrying the tympanal afferents is a branch of the dorsal root from the first abdominal ganglion.

     
  2. 2.

    Both male and female auditory afferent responses are sharply tuned to 30 kHz with sensitivities of 50–55 dB SPL.

     
  3. 3.

    The auditory afferents show little adaptation and accurately code the temporal characteristics of the stimulus with the limit of a resolution of 6–10 ms.

     
  4. 4.

    The difference in threshold between contralateral and ipsilateral afferents for lateral stimuli is greatest at 30 kHz and is at least 10–15 dB.

     
  5. 5.

    Ablation studies indicate that the floppy membrane in the anterolateral corner of the tympanum is crucial for transduction while the medial portion of the tympanum is less important.

     
  6. 6.

    The tiger beetle and acridid (locust and grasshopper) ears have evolved independently from homologous peripheral structures. The neural precursor of the tympanal organs in both animals is likely the pleural chordotonal organ of the first abdominal segment.

     

Key words

Insecthearing Cicindelidae Tympanum Ultrasonic hearing Auditory system evolution 

Abbreviations

SPL

sound pressure level·

ACR

abdominal contraction response

dB SPL

sound pressure level re: 20 μPa

nsa1

segmental nerve root of the first abdominal ganglion

nsa1

dorsal branch of nsa1

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • David D. Yager
    • 1
  • Hayward G. Spangler
    • 2
  1. 1.Department of PsychologyUniversity of MarylandCollege ParkUSA
  2. 2.U.S. Department of AgricultureAgriculture Research Service, Carl Hayden Bee Research CenterTucsonUSA

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