梨星毛虫成虫触角的扫描电镜观察

对梨星毛虫触角的外部形态结构在扫描电镜下作了观察。发现梨星毛虫成虫雌雄蛾触角均为双栉齿状，由柄节、梗节和３３—４０节鞭节组成，雌蛾长度在６．１０—７．１０ｍｍ，雄蛾在６．００—６．９０ｍｍ。触角主干及侧枝的背面，侧面均被鳞片覆盖，绝大部分触角感器位于触角的腹面上，仅有少数着生于触角的背面。新有鞭节的表面均为隆起的折皱状脊纹，但柄节和梗节的表面则无。在梨星毛虫成虫触角上共发现四种感器，即毛形感官、刺形感官、锥形感官和腔锥感官。对梨星毛虫雌雄蛾触角的两性差异进行了观察，并作了详细的讨论，发现梨星毛虫雌雄蛾成虫触角具有典型的性二型现象。雄蛾触角侧板很长，其上的毛形感官多目长；雄蛾触角侧板短，其上的毛形感官少目短。

SCANNING ELECTRON MICROSCOPY OF ANTENNAL SENSILLA OF THE LEAF WORM,ILLIBERIS PRUNI DYAR

Abstract The fine structures of the antennae of pear leaf worm, Illiberis pruni Dyar were observed by a scanning electromicroscopy. The antennae of pear leaf worm consist of two hasal segmentsscape and pedicel,and 33-4o flagellar segments. Four types of sensilla were found on the antennae of adult Illiberis pruni Dyar, namely Sensilla trichodea, Sensilla chaetica, Sensilla coeloconica and Sensilla Basiconica.The sensilla trichodea are the most aboudant on the antannae of the moths. Thet can be subdivided into two distinct types: type A and type B. Type A trichodea is longer than type B. Type A trichodea is straight and slightly curved at the tip. Type B trichodea has a blunt tip, strongly bend down near its base and runs parallel with the surface of the antennae.The 5th, 10th, 20th, 30th segments of both sexes were selected for the comparative observations on the difference of the sensilla trichodea. Sensilla trichodea are more numerous and longer on the antennae of male moths than on those of female's. This showed that there is a obvious sexual dimorphism of the antennae of male and female moths