小粒材小蠹成虫触角结构与感受器的扫描电镜观察

Antenne Structure of Xyleborus saxeseni Adult Observed with Scanning Electron Microscope

对小粒材小蠹雌、雄成虫触角进行了扫描电镜观察。结果表明:小粒材小蠹雄成虫触角长度仅为雌成虫的4/5,但雌雄成虫之间触角形态、感受器类型和分布均无显著差异。成虫触角具有6种类型感受器:板形感受器、锥型感受器、毛形感受器、锯齿形感受器、芽形感受器和刺形感受器,其中板形感受器数量最多,占总感受器的52%,刺形感受器数量最少,仅13根。在触角各节中,以锤头部感受器数量最多,约占总感受器的90%,其中约76%的感受器着密集生于锤头部的近端2节处,柄节和梗节数量较少,分别约占总感受器的4%和1%。

Antennae structures of female and male Xyleborus saxeseni were observed with scanning electron microscope.The results showed that there were no significant differences in the antenna morphological characters,sensilla types and their distribution patterns between the females and males,although the antenna of the males were 4/5 as long as females.The sensilla were identified for six types： placoid,basiconic,trichoid,zigzag,bud-shaped,and chaeticum sensillum.Placoid sensillum was the dominant type,which accounted for 52%,while chaeticum sensillum was the least numerous class of sensilla,olny for 13 sensilla.The majority of sensilla crowded together on the club of the antennae and occupied for ca.90% of the total sensilla,of which ca 76% of the sensilla were mainly occurred on the two proximal parts.However,sensilla on the scape and funicle had approximately 4% and 1% of all sensilla,respectively.