Structure and function of antennal pore plate sensilla of oryctes rhinoceros (L.) (Coleoptera : Dynastidae) |
| |
| Affiliation: | 1. INRA Unité de Phytopharmacie et Médiateurs Chimiques, Route de Saint Cyr. F78026 Versailles Cedex, France;2. CIRAD-CP, Unité de Phytopharmacie et Médiateurs Chimiques, Route de Saint Cyr. F78026 Versailles Cedex, France;1. School of Biological Sciences, University of Queensland, St. Lucia, QLD, 4072, Australia;2. Faculty of Biology, Hanoi National University of Education, Hanoi, Viet Nam;3. Department of Agriculture and Fisheries, Ecosciences Precinct, GPO Box 267, Brisbane, QLD, 4001, Australia;1. Department of Psychology, Center for Neuroscience, University at Albany, State University of New York, Albany, New York, USA;2. Neurosciences Program, University of Southern California, Los Angeles, California, USA;1. Rotman Institute of Philosophy, University of Western Ontario, London, Ontario, N6A 5B8, Canada;2. Department of Philosophy, University of Manchester, Oxford Road, Manchester, UK;3. Cognition and Philosophy Lab, Department of Philosophy, Monash University, Victoria, Australia;4. The Brain and Mind Institute, University of Western Ontario, London, Ontario, N6A 5B7, Canada;1. Brain Plasticity Unit, UMR 8249, CNRS, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005 Paris, France;1. MoRe Research Örnsköldsvik AB, SE-891 22 Örnsköldsvik, Sweden;2. Department of Fiber and Polymer Technology, Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;3. Politecnico di Torino, Alessandria Site, Viale Teresa Michel 5, 15121 Alessandria, Italy |
| |
| Abstract: | The antennae of the rhinoceros beetle, Oryctes rhinoceros (Coleoptera : Dynastidae), comprise 4 parts : the scape, the pedicel, a funicle, and a club of 3 lamellate segments. The inner surfaces of the lamellate club segments carry one type of trichoid sensilla, 2 types of sensilla coeloconica, and 3 types of multiporous pore plate sensilla. The total surface occupied by the sensilla on the antenna is 5.2±0.4 mm2 in males (mean±SD) and 5.4±0.5 mm2 in females. With a measured density of 8665±1254 sensilla per mm2 in males and 8952±1642 sensilla per mm2 in females, the total number of pore plate sensilla was estimated to be between 45,000 and 50,000. The structure of the 3 types of pore plate sensilla is described. SP1 are the most abundant type of placoid sensilla. They show a convex and rugged plate whose infoldings form a circle of irregular cavities. SP2 sensilla are characterised by a smooth and convex plate, surrounded by a furrow with a ridge. SP2 are localised on a wide band situated along the straight side of the lamella. The plate of SP3 is nearly flat and there is no furrow. SP3 are confined within a narrow margin along the convex edge of lamellae. The 3 types of pore plate sensilla house 2 neurones whose dendrites branch repeatedly under a plate of thin (0.2 μm) cuticle, which is pitted with numerous pores, 40 nm in diameter. Single sensillum recordings with tungsten microelectrodes revealed the firing activity of 2 neurones. These receptor neurones responded specifically to olfactory stimulus. Olfactory receptor neurones tuned to the male pheromone compound, ethyl 4-methyl octanoate, were found in male and female antennae. Other receptor neurones responded to plant volatiles. Morphological and electrophysiological data suggest the absence of a sexual dimorphism in the olfactory organs. The functional organisation of the olfactory organs is discussed in terms of their adaptation to the ecology of O. rhinoceros. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
