A Cold Receptor on the Tick, Rhipicephalus Appendiculatus: Electrophysiological and Ultrastructural Observations

  • S. M. Waladde
  • E. D. Kokwaro
  • M. Chimtawi


A sensillum trichodeum on tarsus I of Rhipicephalus appendiculatus displays a tonic impulse frequency at constant temperature but shows a phasic-tonic increased activity when temperature is lowered. Rising temperature has an inhibitory effect. Ultrastructural details show that it bears resemblance to a double-walled sensillum with spoke canals, and has dendrites of seven receptor cells. One of the cells responds to temperature changes. The function of the others is unknown.

Key Words

Tick sensilla Rhipicephalus appendiculatus thermoreception cold receptor 


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Copyright information

© ICIPE 1981

Authors and Affiliations

  • S. M. Waladde
    • 1
  • E. D. Kokwaro
    • 1
  • M. Chimtawi
    • 1
  1. 1.International Centre of Insect Physiology and EcologyNairobiKenya

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