Ultrastructure of spermiogenesis and spermatozoa of Gymnotus cf. anguillaris and Brachyhypopomus cf. pinnicaudatus (Teleostei : Gymnotiformes)

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dc.contributor.authorFranca, G. F.
dc.contributor.authorOliveira, C.
dc.contributor.authorQuagio-Grassiotto, I.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2014-05-20T13:51:18Z
dc.date.available2014-05-20T13:51:18Z
dc.date.issued2007-04-01
dc.description.abstractThe ultrastructure of spermiogenic stages and spermatozoa of representatives of two gymnotiform families, Gymnotus cf. anguillaris (Gymnotidae) and Brachyhypopomus cf. pinnicaudatus (Hypopomidae) were studied. Spermiogenesis of both species is characterized by lateral development of the flagellum and formation of a nuclear fossa. Some differences were found between these species, such as whether (B. cf. pinnicaudatus) or not (G. cf. anguillaris) nuclear rotation occurs, permanence of the cytoplasmic channel, and type and localization of the nuclear fossa. In the G. cf anguillaris spermatozoon the nucleus is spherical with highly condensed chromatin. The nuclear fossa is shallow and lateral and is associated with the centriolar complex through stabilizing fibrils. The midpiece is short, with many vesicles, a cytoplasmic channel, and elongate mitochondria. In the B. cf. pinnicaudatus spermatozoon the ovoid nucleus is elongated lateral and posterior to the centriolar complex, and has highly condensed chromatin. The eccentric nuclear fossa is of the moderate type, and contains the entire centriolar complex. The midpiece is long, with numerous vesicles, elongate mitochondria, and no cytoplasmic channel. In both species the flagella are laterally disposed in relation to the nucleus and comprise of the classical 9 + 2 axoneme. Most of the characteristics found in the spermatozoa of these two species of Gymnotiformes are shared with species of Characiformes, whereas only a few are also found in Siluriformes. This suggests that Gymnotiformes and Characiformes may be more closely related than previously proposed. (C) 2007 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Morphol, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUniv Estadual Campinas, Inst Biol, Dept Biol Celular, BR-13084971 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Morphol, BR-18618000 Botucatu, SP, Brazil
dc.format.extent131-139
dc.identifierhttp://dx.doi.org/10.1016/j.tice.2007.02.003
dc.identifier.citationTissue & Cell. Edinburgh: Churchill Livingstone, v. 39, n. 2, p. 131-139, 2007.
dc.identifier.doi10.1016/j.tice.2007.02.003
dc.identifier.issn0040-8166
dc.identifier.urihttp://hdl.handle.net/11449/18328
dc.identifier.wosWOS:000246878500006
dc.language.isoeng
dc.publisherChurchill Livingstone
dc.relation.ispartofTissue & Cell
dc.relation.ispartofjcr1.438
dc.relation.ispartofsjr0,410
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectspermpt
dc.subjectmorphologypt
dc.subjectelectron microscopypt
dc.subjectfish evolutionpt
dc.subjectknifefishpt
dc.titleUltrastructure of spermiogenesis and spermatozoa of Gymnotus cf. anguillaris and Brachyhypopomus cf. pinnicaudatus (Teleostei : Gymnotiformes)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderChurchill Livingstone
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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