北京林业大学学报2024，Vol.46Issue(4)：63-73,11.DOI:10.12171/j.1000-1522.20230105
短毛切梢小蠹幼虫头部感器的类型、分布与数量特征
Type,distribution and quantitative characteristics of sensory organs on the larval head of Tomicus brevipilosus(Coleoptera:Curculionidae:Scolytinae)
摘要
Abstract
[Objective]To provide a scientific basis for further exploration of foraging and moving about the larval behaviors of Tomicus bravipilosus(Coleoptera:Curculionidae:Scolytinae),we investigated the morphological adaptation and function of the sensilla on the larval head of this bark beetle.[Method]We examined and compared the types,distribution,and abundance of sensory organs on the head of the first,second,and third instar larvae using scanning electron microscopy(SEM).[Result]The head shape of the larvae was hypognathous.Its head appendages contained a pair of antennae,stemmata,mandible,maxilla,maxillary palp,labial palp,as well as a single labrum and labium.Totally,there were 15 types of identified sensilla.The reduced antennae with one segment had five types of antennal sensilla,identified as sensilla basiconica type Ⅰ and sensilla twig basiconica type Ⅰ-Ⅳ.The biting mouthparts were involved in 12 types,including sensilla chaetica type Ⅰ-Ⅴ,sensilla trichodea type Ⅰ-Ⅱ,sensilla basiconica type Ⅱ,sensilla digitiformina,and sensilla twig basiconica type Ⅱ,Ⅳ,and Ⅴ.Sensilla trichodea and sensilla chaetica having smooth and nonporous surface were widespread and classified as mechanoreceptors.Sensilla basiconica and sensilla twig basiconica having the surface pores distributed exclusively on the apex of the antennae,maxillary palp and labial palp,and were classical chemoreceptors.Sensilla digitiformia having only one unit on the second segment of every maxillary palp were considered as the acoustic sensor for the mechanical vibrations.With an increase of larval instar,each sensilla types,abundance,and distribution on the head appendages kept consistent with the different instar larvae.However,sensilla sizes showed exponential growth compared with the last instar larvae.[Conclusion]This research clarifies the head structures and sensilla types,distribution,abundance,and instar changes of the sensilla on the larval head of T.brevipilosus.Chemical sensors are concentrated at the tips of the antennae,mandibular palps,and labial palps,which is a distribution pattern that aids the larvae in feeding and moving within the bark-cavities.The study has conducted a detailed exploration of the functions of the chemical sensors,which will provide a scientific basis for the next step of studying the information perception of T.brevipilosus larvae within its galleries.It is expected to take a shred of scientific evidence for further behavioral drivers of chemical sensation in the gallery of T.brevipilosuslarvae.关键词
短毛切梢小蠹/幼虫头部/感受器/扫描电镜Key words
Tomicus brevipilosus/larval head/sensilla/scanning electron microscopy分类
生物科学引用本文复制引用
张艳琳,鲁国艳,向宇涛,杨斌,李宗波..短毛切梢小蠹幼虫头部感器的类型、分布与数量特征[J].北京林业大学学报,2024,46(4):63-73,11.基金项目
云南省高原特色农业领域科技计划项目(202302AE090017),云南省基础研究重点项目(202101AS070009、2018FG001-010),兴滇英才支持计划项目"青年拔尖人才"(YNWR-QNBJ-2018-131). （202302AE090017）
