Structure and ultrastructure of spermatozoa of Chrysomya megacephala (Diptera: Calliphoridae) |
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| Authors: | KPO Name JR Pujol-Luz SN Báo |
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| Institution: | 1. Programa de Pós-graduação em Biologia Animal, Universidade de Brasília, DF, Brazil;2. Laboratório de Microscopia Eletrônica, Departamento de Biologia Celular, Instituto de Ciências Biológicas, Universidade de Brasília, Distrito Federal, CEP: 70919-970, Brazil;3. Núcleo de Entomologia Urbana e Forense, Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade de Brasília, DF, Brazil;1. Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland;2. Centre for Ecology and Conservation, University of Exeter, Penryn, U.K.;1. Laboratory of Insects, Department of Morphology, Bioscience Institute, UNESP – São Paulo State University, Botucatu, SP 18618-970, Brazil;2. Department of Biostatistics, Bioscience Institute, UNESP – São Paulo State University, Botucatu, SP 18618-970, Brazil;3. Electron Microscopy Center, Bioscience Institute, UNESP – São Paulo State University, Botucatu, SP 18618-970, Brazil;1. Programa de Pós-Graduação em Ciências Biológicas (Zoologia), Instituto de Biociências, Departamento de Zoologia, Universidade de São Paulo, Rua do Matão, Travessa 14, Número 321, São Paulo 05508-900, SP, Brazil;2. Museu de Zoologia, Universidade de São Paulo, Avenida Nazaré, 481, São Paulo 04263-000, SP, Brazil;3. Caixa Postal 1206, Carambeí 84145-000, PR, Brazil |
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| Abstract: | The spermatozoa of Chrysomya megacephala are similar to those described for other Brachycera. In this species, the spermatozoa are long and thin, measuring about 590 μm in length, of which the head region measures approximately 60 μm. The head includes a monolayered acrosome with electron-lucid material, and the shape of the nucleus, in cross-sections, varies from circular to oval with completely condensed chromatin. The centriole was observed in the zone of flagellar implantation, below the “peg” region. In the region of overlap, the followings structures are observed: nucleus, centriolar adjunct, mitochondrial derivatives and axoneme. The two mitochondrial derivatives are of different lengths but similar diameter. The axoneme is of a conventional insectan type with a 9 + 9 + 2 microtubular arrangement, with accessory tubules flanked by the electron-dense intertubular material. The male internal reproductive tract consists of testis, vas deferens, seminal vesicle, accessory glands and ejaculatory duct. |
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