The epipharyngeal sensilla of the damselfly Ischnura elegans (Odonata,Coenagrionidae) |
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| Institution: | 1. Laboratory of Animal Cell Biology and Embryology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, PR China;2. Shanghai Laboratory Animal Research Centre, Shanghai Institutes for Biological Sciences, Shanghai, China;1. Department of Zoology, University of Silesia in Katowice, Bankowa 9, 40-007 Katowice, Poland;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;3. School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Ave., Bristol, BS8 1TQ, UK;4. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;1. Plant Biology and Nature Management, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium;2. Wetland and Marine Section, Centre for Biodiversity Department, National Museums of Kenya, P.O. Box 40658-00100, Nairobi, Kenya;3. Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;4. Lake Naivasha Riparian Association, P.O. Box 358, Naivasha 20117, Kenya;5. Ecology Consultant, 5825 Bent Twig Rd., McLean, VA 22101, USA;1. Warsaw University of Technology, Faculty of Materials Science and Engineering, ul. Woloska 141, 02-507 Warsaw, Poland;2. Ecole des Mines de St-Etienne, 158 Cours Fauriel, 42023 St-Etienne, France |
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| Abstract: | The knowledge on Odonata adult mouthparts sensilla is scanty and, notwithstanding the epipharynx in the labrum is considered an organ of taste, no ultrastructural investigation has been performed so far on this structure in Odonata. The labrum of the adult of the damselfly Ischnura elegans (Odonata, Coenagrionidae) shows on its ventral side the epipharynx with sensilla represented by articulated hairs and by small pegs located at the apex of slightly raised domes. Under scanning and transmission electron microscope, the articulated hairs, with a well developed socket and tubular body, have the typical structure of bristles, the most common type of insect mechanoreceptors, usually responding to direct touch; the pegs, showing an apical pore together with a variable number of sensory neurons (from two to five), the outer dendritic segments of which show a dendrite sheath stopping along their length, have features typical of contact chemoreceptors. |
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| Keywords: | Aquatic insects Mouthparts Chemoreceptors Mechanoreceptors Gustatory sensilla |
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