Ultrastructure of the sensilla on larval antennae and mouthparts in the peach fruit moth, Carposina sasakii Matsumura (Lepidoptera: Carposinidae).

The ultrastructure of the sensilla on the larval antennae and mouthparts of the peach fruit moth, Carposina sasakii Matsumura, were investigated using scanning electron microscopy. On each three-segmented antenna, the basal scape is devoid of sensilla, the pedicel possesses two sensilla chaetica and three sensilla basiconica, and the terminal flagellum carries distally one sensillum styloconicum and three sensilla basiconica. The labrum bears six pairs of sensilla chaetica; the epipharynx carries two pairs of small epipharyngeal sensilla, three pairs of flattened sensilla chaetica, and a pair of broad sensillum digitiformium. Each dentate mandible carries two sensilla chaetica basally on its outer face. On the maxillae, the cardo and stipes each carry a sensillum chaeticum distally; each galea has three elongate flattened sensilla basiconica, two short sensilla chaetica, and two large sensilla styloconica. The distal segment of the maxillary palp possesses distally seven sensilla basiconica and one sensillum styloconicum, and laterally one sensillum digitiformium and one sensillum placodeum. Each labial palp bears distally a short cone-shaped sensillum chaeticum and an elongate slender sensillum styloconicum. The possible functions of these sensilla in the feeding process are briefly discussed.