华山松大小蠹感受器的类型和分布

【目的】揭示华山松大小蠹感受器的超微结构和分布规律，为进一步探索华山松大小蠹对寄主树木的识别机制和行为调控提供理论依据。【方法】对华山松大小蠹雌雄成虫及幼虫全身的感受器进行扫描电镜和透射电镜观察。【结果】华山松大小蠹成虫头部是感受器分布集中的部位，成虫的前足、鞘翅和膜翅也有化学感受器的分布，主要有毛形感器、刺形感器、锥形感器、栓锥形感器、B?hm氏鬃毛、钟形感器和芽形感器7种类型；幼虫全身分布B?hm氏鬃毛、锥形感器、栓锥形感器。触角毛形感器是单层壁孔感器，孔状结构连接内腔神经；触角刺形感器是3～4层壁无孔感器；锯齿形毛状结构内部无神经等结构。【结论】位于触角的毛形感器是华山松大小蠹识别寄主树木的主要嗅觉感受器类型；刺形感器不是感受气体物质的嗅觉感受器；锯齿形毛状结构是防止虫体受到机械伤害的微毛，不具备感受器功能。

Sensilla types and ultrastructure of Dendroctonus armandi (Coleoptera:Scolytidae)

【Objective】 The research aimed at observing the sensilla distribution and ultrastructure in order to reveal its olfactory system mechanism.【Method】 Scanning electron microscopy and transmission electron microscopy were used to observe the sensilla on the overall surface of adult D.armandi and its larvae.【Result】 The heads are the primary sensory organs of Chinese white pine beetle.Meanwhile there are different types of sensilla found on the surfaces of their fore legs,membranous wings and elytra.We described 7 morphological types of sensilla on the overall surface of adult D.armandi and its larvae:sensilla trichodea,sensilla chaetica,sensilla basiconica,sensilla styloconica,sensilla campaniformia,bhm bristle and bud-shaped sensilla.The sensilla trichodea are unilaminar cuticle sensilla with pores along the surface making sensory processes to the dendrites in the lumen;the sensilla chaetica have three to four layers cuticle but no pores;the zigzag microtriches are composed only by cuticle.【Conclusion】 The sensilla trichodea are olfactory organs proved by their morphology and ultrastructure;the sensilla chaetica do not have the olfactory function;the zigzag microtriches are not sensilla.