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Role of the male claw sensilla in perception of female mounting sex pheromone in Dermacentor variabilis, Dermacentor andersoni and Amblyomma americanum

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Abstract

The foreleg claw sensilla of male D. variabilis, D. andersoni and A. americanum ticks indlude the receptors that perceive the female contact mounting sex pheromone (MSP). In all three tick species, the foreleg claw sensilla comprise six anteriorly-directed setae arranged in three symmetrical pairs, two each on the opposite sides of the apotele of the claw and one on the ventral side. Morphological study and behavioral bioassays of these setae revealed that only the dorsal and middle (=lateral) pairs of claw sensilla are mechanogustatory. While the ventral pair are strictly mechanoreceptors. The dorsal and middle sensory setae exhibit a single pore-like structure located at or near their tip, a feature characteristic of mechanogustatory sensilla. These setae are similar to those found on the palps that are believed to function as pheromone receptors. In all three tick species, male mounting and postmounting behaviors were suppressed only when the dorsal and middle pairs of claw sensilla were ablated or covered with gelatin; normal behavior was restored when the gelatin was removed. Doscresponse bioassays were conducted with D. variabilis males to authenticate the results of the gelatin tests. The results of these bioassays demonstrated that the gelatin coat was impervious to the pheromone. The characteristics of the ixodid tick mating system that distinguish it from mating processes in other arthropods are discussed.

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  1. Department of Biological Sciences, Old Dominion University, 23529, Norfolk, Virginia, USA

    James S. Phillips & Daniel E. Sonenshine

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  1. James S. Phillips
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Phillips, J.S., Sonenshine, D.E. Role of the male claw sensilla in perception of female mounting sex pheromone in Dermacentor variabilis, Dermacentor andersoni and Amblyomma americanum . Exp Appl Acarol 17, 631–653 (1993). https://doi.org/10.1007/BF00058504

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