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    桉蝙蛾幼虫触角及胸腹体表感器形态及分布特征

    Morphology and distribution of sensillum on antennal, thoracic and abdominal tegument of Endoclita signifier larva

    • 摘要:
        目的  基于感器形态、类型、数量、分布特征,探究桉蝙蛾幼虫触角及体表感器与其蛀道生活的适应性。
        方法  利用扫描电镜观察桉蝙蛾4龄幼虫触角、胸部及腹部体表感器的形态特征并分类,结合测量、统计分析和等比例绘图,分析感器数量和分布特征。
        结果  桉蝙蛾幼虫触角感器主要分布在鞭节末端,共有8对感器,分别是3对刺形感器、4对锥形感器和1对栓锥形感器,推测其感器类型能满足幼虫感受化学及机械刺激的需求。胸腹部体表的感器类型是Bohm’s鬃毛及刺形感器;其中刺形感器分3个亚型,基部至中部均为螺旋状;刺形感器Ⅱ型最独特,外壁具有刺状突起,推测其在幼虫的机械伸缩及防御上起作用。
        结论  桉蝙蛾幼虫触角及体表感器类型与其蛀道生活相适应,该结果为桉蝙蛾幼虫寄主选择与适应研究提供基础。

       

      Abstract:
        Objective  Based on the morphological characteristics, types, distribution and quantity of sensilla, the adaptability between the antennal, thoracic and abdominal tegument sensilla of Endoclita signifier larvae and their wormhole was investigated.
        Method  Scanning electron microscopy combined with measurement, statistical analysis, and scale mapping were used to observe, describe and make statistics of the sensillum on antennal, thoracic and abdominal tegument of the 4th instar E. signifier larvae.
        Result  The antennal sensilla of E. signifier larvae were mainly distributed at the end of the flagellum, consisting of eight pairs of sensilla, including three pairs of sensilla chaetica, four pairs of sensilla basiconca, and one pair of sensilla styloconica, which can satisfy the chemical and mechanical sensory needs of the larvae. The sensillum types on the surface of thoracic and abdominal tegument were Bohm’s bristle and three subtypes of sensilla chaetica. All sensilla chaetica had spiral lines, and sensilla chaetica typeⅡ was the most unique, with spinous protrudes on its outer wall, which play a role in the mechanical expansion and defense of the larvae.
        Conclusion  The antennal, thoracic and abdominal tegument sensilla of E. signifier larvae were adapted to their living environment, and the results will provide basic support for subsequent feeding behavior, olfactory recognition, and selective adaptation of E. signifier larvae.

       

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