Scanning electron microscopic observations on the body surface of the tick Ixodes acutitarsus recovered from semi-wild cattle Bos frontalis revealed the occurrence of fifteen different types of sensory structures. Dorsal side of the body have six types of sensilla like cuticular pit sensilla, sensilla basiconica type I, sensilla basiconica type II, sensilla chaetica type I, sensilla chaetica type II, and bifid sensilla. Whereas, ventral side of the parasite have seven types of sensilla namely sensilla chaetica type I, sensilla chaetica type III, coeloconic sensilla, sensilla trichodea type I, sensilla trichodea type II, sensilla trichodea type III and hair plate sensilla. In the anterior portion of the body, palps are provided with sensilla basiconica type III. In the first pair of legs Hallers organ is provided with four types of sensilla like sensilla chaetica type III, sensilla basiconica type III, multiporous sensilla type I and multiporous sensilla type II. Functional significance of the sensilla in the parasite is discussed.
Keywords: scanning electron microscopy, sensilla, Ixodes acutitarsus, Bos frontalis
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