混腔室茧蜂触角微观结构的扫描电子显微镜观察

Microstructure of Antennal Sensilla in Aulacococentrum confusum Observed with Scanning Electron Microscopy

混腔室茧蜂(Aulacococentrum confusum)是桑树害虫桑螟(Diaphania pyloalis)的优势寄生蜂。应用扫描电子显微镜技术观察混腔室茧蜂触角感器的微观结构,以利于对该寄生蜂的寄主搜索、求偶和取食等行为生态学及保护生物学进行研究。观察结果表明,混腔室茧蜂雌、雄成虫触角上共有6种感器,分别为毛形感器、Bhm鬃毛、板形感器、栓锥形感器、锥形感器和刺形感器,其中栓锥形感器仅分布于雌蜂触角上,其余感器的数量、大小在雌蜂和雄蜂之间无显著差异。与多数茧蜂科寄生蜂相比,混腔室茧蜂成虫的触角明显偏长,雌、雄蜂触角长度分别达到19.3 mm±1.9 mm、16.4 mm±3.4 mm,推测与其搜寻在桑叶上隐蔽取食的寄主桑螟有关。

Aulacococentrum confusum( Hymenoptera:Braconidae) is the preponderant parasitoid wasp of mulberry pyralid,Diaphania pyloalis( Lepidoptera:Pyralididae). In order to study the behavioural ecology of host foraging,courtship,feeding and conservation biology in parasitoids,the microstructure of antennal sensilla in Aulacococentrum confusum was observed with scanning electron microscopy. The results showed that there were six types of sensilla on the antennae,including sensilla trichodea,bhm bristle,sensilla placodea,sensilla styloconica,sensilla basiconic and sensilla chaetica. Sensilla styloconica was observed on females' antennae exclusively. The differences of number and size of the rest sensilla between male's and female's antennae were not significant. Compared to the majority of the Braconidae family,the length of the adult antennae in Aulacococentrum confusum was significantly longer. The length of antennae was 19. 3 mm ± 1. 9 mm and 16. 4 mm ± 3. 4 mm in female and male wasps respectively. It could be speculated that this difference was caused by host foraging of Aulacococentrum confusum to Diaphania pyloalis which bears the conceal feeding habit in mulberry trees.