Song Li-Mei, Wang Xue-Min, Huang Jian-Ping, Zhu Fang, Jiang Xiang, Zhang Shan-Gan, Ban Li-Ping
Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, China.
Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.
PLoS One. 2017 Mar 30;12(3):e0174643. doi: 10.1371/journal.pone.0174643. eCollection 2017.
The morphology and distribution of the antennal sensilla of adult diving beetle Cybister japonicus Sharp (Dytiscidae, Coleoptera), have been examined. Five types of sensilla on the antennae were identified by scanning electron microscope (SEM) and transmission electron microscope (TEM). Sensilla placodea and elongated s. placodea are the most abundant types of sensilla, distributing only on the flagellum. Both these types of sensilla carry multiple pore systems with a typical function as chemoreceptors. Three types of s. coeloconica (Type I-III) were also identified, with the characterization of the pit-in-pit style, and carrying pegs externally different from each other. Our data indicated that both type I and type II of s. coleconica contain two bipolar neurons, while the type III of s. coleconica contains three dendrites in the peg. Two sensory dendrites in the former two sensilla are tightly embedded inside the dendrite sheath, with no space left for sensilla lymph. There are no specific morphological differences in the antennal sensilla observed between males and females, except that the males have longer antennae and more sensilla than the females.
对日本牙甲（Cybister japonicus Sharp）（鞘翅目，龙虱科）成虫触角感器的形态和分布进行了研究。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）鉴定出触角上有五种类型的感器。板形感器和细长板形感器是最丰富的感器类型，仅分布在鞭节上。这两种类型的感器都带有多个孔系统，具有典型的化学感受器功能。还鉴定出三种腔锥形感器（I - III型），其特征为坑中坑样式，外部带有彼此不同的栓。我们的数据表明，腔锥形感器的I型和II型都包含两个双极神经元，而腔锥形感器的III型在栓中包含三个树突。前两种感器中的两个感觉树突紧密嵌入树突鞘内，没有为感器淋巴留下空间。除了雄性触角比雌性更长且感器更多外，未观察到雌雄触角感器在形态上有特定差异。
