Sensilla on the Antennal Funiculus of the Maize Weevil, Sitophilus ZEAMAIS (MOTSCHULSKY) (COLEOPTERA: CURCULIONIDAE) : A MORPHOLOGICAL INVESTIGATION
Shen, C.; Zhang, Y.; Xia, D.; Wang, J.; Tang, Q.
Coleopterists Bulletin 73(2): 443-450
Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) has a great capacity to destroy stored grain worldwide. We report on the sensilla on the antennal funiculus of S. zeamais, using classical anatomical methods and scanning electron microscopy to obtain a detailed database of the antennal sensilla for each sex. The antenna is composed of eight antennomeres. Average antennal length is 781.58 +/- 20.64 mu m for males and 808.91 +/- 11.80 mu m for females. Six types and subtypes of sensilla were identified on the funiculus: squamiform, basiconic (2 subtypes), chaetic (2 subtypes), and coeloconic. Sensilla squamiformia are distributed evenly but in few numbers on male and female antennomeres. Sensilla basiconica can be divided into subtypes, SB1 and SB2, according to the shape of the cone. Both subtypes occur on the last antennomere of the flagellum and there are fewer SB2 than SB1. Sensilla chaetica appear in the same position as sensilla basiconica and have two subtypes, SC1 and SC2. Significant differences were not found in the types of sensilla on the antennae of the two sexes, but a difference was found in the number of sensilla.