title: Ultrastructure and morphology of antennal sensilla of the adult diving beetle Cybister japonicus Sharp.
abstract: 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.
authors.affiliation: Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, China.
authors.forename: Li-Mei
authors.initials: LM
authors.lastname: Song
authors.affiliation: Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Xue-Min
authors.initials: XM
authors.lastname: Wang
authors.affiliation: Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, China.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Huang
authors.affiliation: Department of Entomology, Washington State University, Pullman, Washington, United States of America.
authors.forename: Fang
authors.initials: F
authors.lastname: Zhu
authors.affiliation: Huangpu Entry-Exit Inspection and Quarantine Bureau, Guangdong, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
authors.forename: Shan-Gan
authors.initials: SG
authors.lastname: Zhang
authors.affiliation: Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, China.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Ban
mesh_terms: D000818:Animals; D001517:Coleoptera / Q000033:anatomy & histology / Q000648:ultrastructure; D003712:Dendrites / Q000648:ultrastructure; D005260:Female; D005407:Flagella / Q000648:ultrastructure; D008297:Male; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009474:Neurons / Q000648:ultrastructure; D058618:Sensilla / Q000033:anatomy & histology / Q000648:ultrastructure; D012727:Sex Characteristics