L'oeuf de Myrmeleotettix maculatus Thunb. (Orthoptera : Acrididae): Absorption d'eau et structure fine des enveloppes |
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| Institution: | 1. Schlegel-University of Waterloo Research Institute for Aging, Waterloo, Ontario, Canada;2. École des sciences des aliments, de nutrition et d’études familiales, Faculté des sciences de la santé et des services communautaires, Université de Moncton, Moncton, New Brunswick, Canada;3. Faculty of Nursing, University of Alberta, Edmonton, Alberta, Canada;4. Faculty of Agricultural & Food Sciences, University of Manitoba, Winnipeg, Manitoba, Canada;5. Toronto Rehabilitation Institute, University Health Network, Toronto, Ontario, Canada;6. Rehabilitation Sciences Institute, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada;7. Department of Food Science, University of Guelph, Guelph, Ontario, Canada;8. Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada;9. Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, Ontario, Canada;10. Department of Gerontology, Simon Fraser University, Vancouver, British Columbia, Canada;11. School of Dentistry, Edmonton Clinic Health Academy, University of Alberta, Edmonton, Alberta, Canada;12. Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada;13. Conestoga College, School of Health Sciences and Community Services, Kitchener, Ontario, Canada;1. Japan International Research Center for Agricultural Sciences (JIRCAS), Livestock and Environment Division, Ohwashi 1-1, Tsukuba, Ibaraki 305-8686, Japan;2. CIRAD, UMR CBGP, INRAE, Institut Agro, IRD, Université Montpellier, F-34398 Montpellier, France;3. Ibn Zohr University, Agadir, Morocco;4. Centre National de Lutte Antiacridienne (CNLAA), Aït-Melloul, BP 125, Inezgane, Agadir, Morocco;1. Key Laboratory for Biobased Materials and Energy, Ministry of Education, South China Agricultural University, Guangzhou, Guangdong, 510640, China;2. College of Materials and Energy, South China Agricultural University, Guangzhou, Guangdong, 510640, China;1. Department of Robotics and Mechatronics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland;2. Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, School of Engineering, Dublin 2, Ireland;1. Department of Neurosurgery, Cleveland Clinic, Cleveland, Ohio, USA;2. Department of Neurosurgery, New York University Grossman School of Medicine, New York City, New York, USA;3. Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, Ohio, USA;4. Department of Health Policy, London School of Economics and Political Science, London, UK |
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| Abstract: | Water absorption and fine structure of the egg shell have been studied in the eggs of Myrmeleotettix maculatus (Orthoptera : Acrididae). At the anterior pole of these eggs, there is a respiratory plastron and at the posterior end, behind the ring of micropyles, many minute holes can be seen. Eggs of M. maculatus incubated on wet filter paper at 30°C absorb water before diapause between the 5th and the 25th day after oviposition. The period of water absorption coincides with the serosal cuticle secretion. The increase in volume of the egg does not seem to involve any fragmentation in the chorion. The chorion is composed of 3 layers (upper, middle and lower). The middle layer, the thickest one, contains twisted elements with a paracrystalline structure. During the first days of incubation, the vitelline membrane becomes changed. In the newly laid egg, it is granular and homogeneous. Five days later, 4 layers with different structures can be distinguished. After 30 days, the serosal cuticle presents a thin epicuticule and a thick lamellated endocuticule with many pore canals. |
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