蠋蝽生殖器及胸足化学感受器的显微结构观察

Microscopic Structure of the Genitals and Thoracic Legs Sensilla of Arma chinensis under the Scanning Electron Microscopy

【目的】蠋蝽是一种重要的捕食性天敌昆虫,观察其生殖器及胸足感受器类型及其形态特征,有助于探究其寄主选择等行为的机理。【方法】采用扫描电镜对蠋蝽生殖器及胸足感受器类型及其形态进行观察。【结果】蠋蝽雄虫交配器和雌虫产卵器上的感受器均有4种,分别为毛形感受器、刺形感受器、腔锥形感受器和锥形感受器,但雌虫产卵器上的刺形感受器和毛形感受器长度长于雄虫交配器;雌虫和雄虫胸足上的感受器有5种,分别为毛形感受器、刺形感受器、腔锥形感受器、锥形感受器以及Böhm氏鬃毛感受器,但雌雄虫胸足上的感受器大小存在一定差异:雌虫中后足上的刺形感受器长度长于雄虫,雌虫后足上的毛形感受器(Ⅰ型和Ⅱ型)长度长于雄虫,雄虫前足上的Böhm氏鬃毛感受器长度长于雌虫。【结论】蠋蝽生殖器和胸足上都存在多种类型的感受器,其形态和种类差异不大,仅部分感受器大小存在差异。

[Purpose]Arma chinensis(Fallou)is an important predatory natural enemy insect.Observing its genital organs,thoracic legs sensilla types and morphological characteristics is helpful to explore the mechanism of host selection and other behaviors.[Method]The types and morphology of sensilla on genitalia and thoracic legs were observed by scanning electron microscopy.[Result]Scanning electron microscopy(SEM)showed that there were four kinds of sensilla on the genitals of A.chinensis:sensilla trichodea,sensilla cheatica,sensilla coeloconica and sensilla basiconica.The length of sensilla trichodea,sensilla cheatica on the ovipositor of female insects is longer than that on the mating organ of male insects.There were five kinds of sensilla on the thoracic legs of A.chinensis:sensilla trichodea,sensilla cheatica,sensilla coeloconica,sensilla basiconica and Böhm’s bristle sensilla.However,there are some differences in the size of the sensilla on the thoracic legs between male and female:the length of the sensilla cheatica on the mid-hind foot is longer in female than in male,the length of sensilla TrichodeaⅠandⅡon the hind foot is longer in female than in male,and the length of Böhm’s bristle sensilla on the forefoot is longer in male than in female.[Conclusion]There are many types of sensilla on the genital organs and thoracic legs of A.chinensis.There are no significant differences in morphology and species,but only some of the receptors are different in size.