Antennal morphology and sensillum distribution in Pissodes validirostris (Coleoptera: Curculionidae)

The antenna and antennal sensilla of Scotts pine cone weevil Pissodes validirostris were examined with scanning electron microscopy. The antenna of adult cone weevil is geniculate, composed of a scape, a pedicle and a flagellum. The flagellum has seven segments. Six types of antennal sensilla were found in an antenna: trichodea, chaetica, scolopalia, palmate, basiconica and Böhm bristles. Sensilla palmate are most abundant. Sensilla scolopalia (Ss) have three subtypes: SsI and SsII were found verticulate in pedicle and flagellum, while SsIII are found in scape. Sensilla palmate, sensilla chaetica and sensilla scolopalia are found in the distal end of the seventh segment of flagella. Sensilla basiconica and Böhm bristles are found at the base of pedicles. There were no sexual differences in sensillum morphology, type and distribution.