The scolopidial accessory organ in the Jerusalem cricket (Orthoptera: Stenopelmatidae) |
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| Institution: | 1. Allgemeine & Spezielle Zoologie, Institut für Biowissenschaften, Universität Rostock, Universitätsplatz 2, 18055 Rostock, Germany;2. Zoologisches Institut und Museum, Universität Greifswald, Johann-Sebastian-Bach-Str. 11/12, 17489 Greifswald, Germany;3. Museo Argentino de Ciencias Naturales, Buenos Aires C1405DJR, Argentina;1. School of Aeronautics and Astronautics, Sichuan University, No. 24, South Section 1, Yihuan Road, 610065 Chengdu, China;2. Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Jose Gutierrez Abascal 2, 28006 Madrid, Spain;1. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi Street 1, 51014 Tartu, Estonia;2. Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi Street 1, 51014 Tartu, Estonia;3. Department of Science, University of Roma Tre, Viale G. Marconi 446, I-00146 Rome, Italy;1. Centro de Estudios Parasitológicos y de Vectores (CEPAVE), Facultad de Ciencias Naturales y Museo (UNLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Boulevard 120 S/N e/61 y 62 La Plata, Buenos Aires, Argentina;2. Instituto de Limnología “Dr. Raúl A. Ringuelet”(ILPLA), Facultad de Ciencias Naturales y Museo (UNLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Boulevard 120 S/N e/61 y 62 La Plata, Buenos Aires, Argentina |
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| Abstract: | Multiple mechanosensory organs form the subgenual organ complex in orthopteroid insects, located in the proximal tibia. In several Ensifera (Orthoptera), a small chordotonal organ, the so-called accessory organ, is the most posterior part of this sensory complex. In order to document the presence of this accessory organ among the Ensifera, the chordotonal sensilla and their innervation in the posterior tibia of two species of Jerusalem crickets (Stenopelmatidae: Stenopelmatus) is described. The sensory structures were stained by axonal tracing. Scolopidial sensilla occur in the posterior subgenual organ and the accessory organ in all leg pairs. The accessory organ contains 10–17 scolopidial sensilla. Both groups of sensilla are commonly spatially separated. However, in few cases neuronal fibres occurred between both organs. The two sensillum groups are considered as separate organs by the general spatial separation and innervation by different nerve branches. A functional role for mechanoreception is considered: since the accessory organ is located closely under the cuticle, sensilla may be suited to detect vibrations transferred over the leg's surface. This study extends the known taxa with an accessory organ, which occurs in several taxa of Ensifera. Comparative neuroanatomy thus suggests that the accessory organ may be conserved at least in Tettigoniidea. |
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| Keywords: | Chordotonal organ Neuroanatomy Accessory organ Subgenual organ Mechanosensory |
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