Sitophilus oryzae(Coleoptera: Curculionidae) is an important pest of stored-product, which widely distributes throughout the world. We use scanning electron microscope (SEM) to observe the morphology and ultrastructure of antenna and sensilla of S. oryzae.The antennas of S. oryzae are geniculate that comprised of scape, pedicel, and flagellum with 6 flagellomeres. Three types of sensilla are distinguished: three subtypes of sensilla basiconica (SB 1-3), sensilla chaetica (SC), and two subtypes of sensilla trichodea (ST 1-2). There exist no sexual dimorphisms in types, distribution and density between male and female. The difference with S. oryzae is that sensilla are not evenly distribution over the entire antenna, and are main distributed on the distal end of the last flagellum to form a sensilla cluster. The sensilla on other segments are rare and unitary. In addition, as we found that there exists no difference between S. oryzae and Sitophilus zeamais in the types of antenna sensilla, it is the best way to identify the relative species through the morphological difference of male genitalia.

Sitophilus oryzae; storage pests; antenna sensilla; scanning electron microscope