In order to explore the mechanism underlying chemosensation in Eocanthecona furcellata, the external morphology of its antennae and the type, quantity, distribution and ultrastructure of the sensilla were observed on both sexes of adults and 5th-instar nymphs using scanning electron microscopy. The results showed that the antennae of E. furcellata consisted of three parts: scape, pedicel and flagellum. There were five types of sensilla on the antennae, which included sensilla trichoidea (ST), sensilla chaetica (SCh), sensilla coeloconica (SCo), sensilla basiconica (SB) and squamifornia denticles (SD). Further, there were 4 subtypes of ST and SB and 2 subtypes of SCo and SCh. The number of sensilla on nymphs was significantly lower than that on adults. The antennae of adults showed sexual dimorphism, as the number of sensilla on female adults was higher than that on male adults. SB4 was found only on females and SCo2 was found only on males. These inter-sexual differences may be related to chemoreception of sex pheromone and chemical predation location. The morphology and putative functions of each sensilla were compared and discussed. These results provide a reference for further study of the behavioral biology, chemical ecology and electrophysiology of insects, and also provides a scientific basis for new ways of biological control.

为探讨Eocanthecona furcellata化学感受的机制，采用扫描电镜观察成虫和5龄若虫的触角外部形态和感受器的类型、数量、分布和超微结构。结果表明，E. furcellata的触角由花梗、花梗和鞭毛三部分组成。触角上有五种类型的感受器，包括毛状感受器（ST）、毛状感受器（SCh）、腔感受器（SCo）、基本感受器（SB）和鳞状感受器（SD）。此外，ST和SB有4个亚型，SCo和SCh有2个亚型。若虫的感受器数量明显低于成虫。成虫的触角表现出两性异形，雌成虫的感受器数量多于雄成虫。SB4 仅在女性身上发现，SCo2 仅在男性身上发现。这些两性差异可能与性信息素的化学感受和化学捕食位置有关。比较和讨论了每个感受器的形态和假定功能。