光滑足距小蠹成虫触角感受器的电镜扫描观察

Antennal sensilla of Xylosandrus germanus adult observed with scanning electron microscope

利用扫描电镜对光滑足距小蠹Xylosandrus germanus(Blandford)雌雄成虫触角进行了观察,发现尽管雄成虫触角长度仅为雌成虫的2/3,但是雌雄成虫之间感受器类型和分布形式却相似。成虫触角具有5种类型的感受器:毛型感受器、锯齿型感受器、锥型感受器、芽型感受器和刺型感受器,其中毛型感受器最多,占总感受器的80%以上,刺型感受器最少,仅1根。在触角各节中,以锤状部感受器分布最多,约占总感受器的85%,其中约73%的感受器密集散生在锤状部的末2节,柄节和鞭节的各节均较少,分别约占总感受器的6%和9%。

Antennae of male and female Xylosandrus germanus（Blandford） were observed with scanning electron microscope（SEM）.The results showed that the types of sensilla and their distribution patterns were similar in females and males,although the antenna of males was 2 /3 as long as that of females.There were five types of sensilla：sensilla trichodea,zigzag sensilla,sensilla chaeticum,sensilla basiconica and bud-shaped sensilla.Sensilla triehodea was the dominant type,which accounted for more than 80%,while the number of sensilla chaeticum was the least,only 1 sensillum.Most of the sensilla（about 85%） were distributed on the club of the antenna,of which about 73% of the sensilla were mainly distributed on the two distal segments.There were less sensilla on scape and funicle,only about 6% and 9%,respectively.