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

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Abstract
A sensillum trichodeum on tarsus I of R. 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 7 receptor cells. One of the cells responds to temperature changes. The function of the others is unknown.