Scanning electron microscopy of the eggs of Palingenia longicauda (Olivier) (Ephemeroptera : Palingeniidae) |
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| Affiliation: | 1. Department of Mathematics, National Institute of Technology, Kurukshetra 136119, India;2. Department of Mathematics, Faculty of Arts and Sciences, Cankaya University, Etimesgut, Turkey;3. Institute of Space Sciences, Magurele, Bucharest, Romania;1. Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany;2. Servicio Autónomo Centro Amazónico para la Investigación y Control de Enfermedades Tropicales ‘Simón Bolívar’ (SACAICET), Puerto Ayacucho, Estado Amazonas, Venezuela;3. Center for Global Health, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA;4. Cátedra de Salud Pública, Escuela de Medicina Luis Razetti, Universidad Central de Venezuela, Caracas, Venezuela |
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| Abstract: | The eggs of Palingenia longicauda (Ephemeroptera : Palingeniidae) were studied by scanning electron microscopy (SEM), and showed a biconvex shape with the 2 aspects joined along a thick peripheral border. The eggs were completely wrapped by an exochorion that differs in thickness and organization according to the region of the chorionic surface. The thickest part of the exochorion formed a plaque, which also covered part of the peripheral border, and was constituted of a network of filaments. The remaining part of the exochorion was composed of a thin wrinkled sheet. The micropyle, hitherto unknown in Palingeniidae, appeared as a round opening penetrating into the plaque. The fibrillar network surrounding the micropyle dove-tailed with the egg chorion, forming a differentiated raised process. This peculiar interconnection facilitates egg anchoring to the substratum, and is an adaptation of the fibrous coat to the aquatic environment. |
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