六斑月瓢虫触角及感觉器扫描电镜观察

目的] 明确六斑月瓢虫雌雄成虫触角感觉器种类、分布及形态特征。方法] 利用扫描电子显微镜对六斑月瓢虫雌、雄成虫触角形态及触角感受器超微结构进行观察。结果] 六斑月瓢虫成虫触角由柄节、梗节和鞭节组成,柄节长度与宽度显著大于梗节长度与宽度;鞭节分为9个亚节,末端3节横向膨大呈锤状。雌雄成虫触角上共有8种感觉器:刺形感觉器(SC)、毛形感觉器(ST)、锥形感觉器(SB)、腔形感觉器(CaS)、钟形感觉器(CS)、哑铃形感觉器(DS)、香肠形感觉器(SS)及B?hm氏鬃毛感觉器(BB)。以毛形感觉器和刺形感觉器分布最广,遍布触角;B?hm氏鬃毛仅存在于触角柄节与梗节;触角鞭节第9亚节顶端密布7种触角感觉器。六斑月瓢虫雌雄成虫触角长度、触角感觉器类型及分布无显著差异。结论] 六斑月瓢虫成虫触角上共有8种感觉器,其触角可能具有感知机械刺激、识别化学信息素及感受温湿度变化的作用。本研究为进一步了解六斑月瓢虫触角与其行为间的关系提供基础资料。

Antennal sensilla characteristics of Menochilus sexmaculata Fabricius (Coleoptera: Coccinellidae) using scanning electron microscopy

Aim] We examined the types, distribution, and structural characteristics of antennal sensilla in male and female Menochilus sexmaculata Fabricius. Method] The antennal sensilla and its structural characteristics in male and female adults of M. sexmaculata were examined using scanning electron microscopy. Result] The antennae consist of a scape, pedicel, and flagellum. The scape is longer and wider than the pedicel. The flagellum is divided into 9 segments, and the terminal 3 segments have an enlarged in hammer shape. Eight types of sensilla were detected on the antennae of female and male adults: sensilla chaotic, sensilla trichodea, sensilla basiconca, cavity-like sensilla, campaniform sensillum, dumbbell sensilla, sausage sensilla, B?hm bristle. The sensilla trichodea and sensilla chaetica showed the widest distribution throughout the antennae. B?hm bristle was found only in the scape and pedicel of the antennae. The tip of 9th flagellomeres (F9) was covered with 7 antennal sensilla. There were no significant differences in antennal length, type, or distribution of antennal sensilla between male and female adults. Conclusion] The 8 types of antennal sensilla in M. sexmaculata may function as mechanoreceptors, chemoreceptors, thermoreceptors, and hygroreceptors. This research provides basic data for further analysis of the relationship between antennae and their morphology.