Abstract
Many of true bugs are important pests of cultivated crops, and some are vectors of plants diseases. The pear lace bug, Stephanitis nashi Esaki and Takeya, is a significant pest of fruits and garden crops in East Asia. To provide background information for chemical ecology studies, the antennal morphology and sensilla of both sexes of this species were investigated using scanning electron microscopy. The filiform antennae consist of the scape, pedicel and flagellum. Five types of sensilla were observed, including sensilla basiconica, sensilla trichodea (with four subtypes: St I–IV), sensilla grooved peg, sensilla coeloconica and sensilla campaniformia. Significant sexual dimorphism was found in antenna morphology, including the density of type 2 sensilla trichodea and length of first flagellomere. Males have significantly more sensilla trichodea II (olfactory sensilla) than females, with the main difference found on the first flagellomere and the latter is significantly longer in the male than in the female. The evolution of antennal morphology and the putative functional significance of antennal sensilla are discussed, providing insight into the sensory mechanism.
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