The ultrastructure of the antennal and mouthpart sensillae for the granary weevil, Sitophilus granarius L. (Coleoptera: Curculionidae), adult was examined with scanning electron microscopy. The cephalic capsule bears two types of sensillae—a multibranched sensillum and a multiporous peg sensillum. The multibranched sensillum was a structure not previously reported for the granary weevil or any other insect species, and is distinguished by its torpedo-shaped appearance. The multiporous peg sensillae, formed from multiple straight tubules, are distributed on the distal one-third of the rostrum. The mouthparts bear two types of sensillae—the multiporous peg sensillae on the labrum and mandibles, and short basiconic sensillae on the labial palps. The antenna consists of eight segments arranged on the scape, pedicel, and flagellum. Each antennal segment bears sqaumiform sensillae, and five types of sensillae were identified on the club segment. These sensillae are a trichodea Type I, trichodea Type II, chaetica Type I, chaetica Type II, and double-walled basiconic. Chaetica Types I and II represented >60% of the total sensillae on the club segment. Trichodea Type II sensillae were also observed and were distinguished by the characteristic bifurcate apex. Finally, the double-walled basiconic sensillae were distinguished by the fluted cuticular surface with a grooved peg-like appearance distally.
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