Ovaries and germline cysts and their evolution in Dermaptera (Insecta) |
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| Authors: | Wacław Tworzydło Szczepan M. Biliński Petr Kočárek Fabian Haas |
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| Affiliation: | 1. Department of Systematic Zoology, Institute of Zoology, Jagiellonian University, Ingardena 6, 30-060 Krakow, Poland;2. Department of Biology and Ecology, Faculty of Science, University of Ostrava, Chittussiho 10, 710-00 Ostrava, Czech Republic;3. ICIPE, African Insect Science for Food and Health, Duduville Campus, Kasarani, P.O. Box 30772, 00100 Nairobi, Kenya;1. Department of Animal Histology and Embryology, University of Silesia, Bankowa 9, 40-007 Katowice, Poland;2. Department of Plant Cytology and Embryology, Jagiellonian University in Kraków, 9 Gronostajowa St., 30-387 Kraków, Poland;3. Museum Victoria, GPO Box 666, Melbourne, VIC 3001, Australia;4. Department of Hydrobiology, University of Silesia, Bankowa 9, 40-007 Katowice, Poland;1. College of Life Sciences, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing 100048, China;2. Hebei GEO University, 136 Huaiandonglu, Shijiazhuang City, Hebei 050031, China;3. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012, USA;1. Université de Tunis El Manar, Faculté des Sciences de Tunis, UR11ES12 Biologie de la Reproduction et du Développement Animal, Tunis 2092, Tunisia;2. King Saud University, Department of Zoology, College of Science, Riyadh, Saudi Arabia;1. Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI 48109, USA;2. Medical Scientist Training Program, University of Michigan, Ann Arbor, MI 48109, USA;3. Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA;4. Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA;5. Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA;6. Howard Hughes Medical Institute, University of Michigan, Ann Arbor, MI 48109, USA |
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| Abstract: | We studied the ovary structure and initial stages of oogenesis in 15 representatives of several dermapteran taxa, including the epizoic Arixeniina. In all examined species, the ovaries are meroistic–polytrophic. The ovaries of the basal taxa (‘Pygidicranidae’, ‘Diplatyidae’, and Labiduridae) are composed of elongated ovarioles, attached to short lateral oviducts. In these groups, ovarioles contain several (more than 30) ovarian follicles in a linear arrangement. In the Eudermaptera, the ovaries are composed of 1–6 (Spongiphoridae) or 20–40 (Forficulidae, Chelisochidae) short ovarioles (containing 2 ovarian follicles only) that open to strongly elongated lateral oviducts. In all investigated dermapterans, the ovarian follicles are composed of two germline cells only: an oocyte and a polyploid nurse cell that are covered by a simple follicular epithelium. Our studies indicate that despite a rather unique morphology of the ovarian follicles in the examined species, the processes leading to the formation of the oocyte and nurse cell units are significantly different in basal versus derived taxa.The ovaries of Arixenia esau are composed of 3 short ovarioles attached to a strongly dilated lateral oviduct, ‘the uterus’, containing developing embryos. Histological analysis suggests that the origin of the oocyte and nurse cell units in this species follows the pattern described in eudermapterans.The interpretation of our results in an evolutionary context supports the monophyly of the Dermaptera and Eudermaptera, and the inclusion of the Arixeniina and Hemimerina in the latter taxon. |
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