枣食芽象甲触角感器的扫描电镜观察

Observation of Antennal Sensilla from Scythropus yasumatsui (Coleoptera: Curculionidae) with Scanning Electron Microscope

利用扫描电镜对枣食芽象甲(Scythropus yasumatsui Kono et Morimoto)(鞘翅目:象甲科)雌、雄成虫触角的感器进行观察,比较它们的形态及分布。结果表明,枣食芽象甲雌、雄成虫触角均呈膝焰状,由柄节、梗节和鞭节(含7个鞭亚节)构成,共有7类8种感器,分别为鳞形感器、2种端指形感器、毛形感器、刺形感器、锥形感器、栓锥形感器和芽孢形感器。其中,端指形感器和毛形感器数量较多。各种感器的数量分布以鞭节上最多,柄节次之,梗节最少;触角感器类型及其分布在雌、雄成虫间差异不大,仅雄虫触角平均长度较雌虫长。

Antennal sensilla from male and female adults of Scythropus yasumatsui Kono et Morimoto(Coleoptera:Curculionidae)were observed with scanning electron microscope,and the differences in morphology and distribution of antennal sensilla were analyzed.The results indicated that the antenna of male and female adults had geniculate structure,and it consisted of scape,pedicel and flagella with 7 segments.Seven types and eight kinds were identified,including one kind of sensilla squamiformia,two kinds of finger-like sensillum,one kind of sensilla trichodea,one kind of sensilla chaetica,one kind of sensilla basiconica,one kind of sensilla styloconica and one kind of sensilla gemmiformium.The antenna had more sensillum trichodea and finger-like sensillum than the other types of sensilla.Interestingly,sensillum mainly distributed on flagella and they showed less existence on scape.Although the results presented no clear differences in distribution and morphology of antennal sensilla between male and female adults,but the lengths of antenna from male adults were longer than those from female adults.