Spermatogonia and spermatocyte ultrastructure in Hoplias malabaricus (Teleostei, Characiformes : Erythrinidae)

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dc.contributor.authorNegrao, JNC
dc.contributor.authorde Carvalho, E. D.
dc.contributor.authorForesti, F.
dc.contributor.authorQuagio-Grassiotto, I
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:51:21Z
dc.date.available2014-05-20T13:51:21Z
dc.date.issued2002-07-01
dc.description.abstractThe Hoplias malabaricus primary spermatogonium shows a large nucleus, central nucleolus, and low electron-dense cytoplasm containing nuages. In cysts, they undergo several mitotic divisions with incomplete cytokinesis, giving rise to secondary spermatogonia. These are smaller than the primary spermatogonia and their nuclei have one or two eccentric nucleoli. Spermatocytes I can be identified by the presence of synaptonemal complexes. Spermatocytes II are smaller than spermatocytes 1, displaying roughly compacted chromatin. All these cell types remain interconnected by thick-walled intercellular bridges, which have membranous reinforcements during mitosis and meiosis. These cell types show a well-developed endomembranous system, one of the centrioles anchored to the plasma membrane and small nuages. Their mitochondria are large and circular, with few cristae. In the last generations of spermatogonia, the mitochondria are smaller, elongate and have more cristae. In the spermatocytes, the mitochondria are small and round. Similarities found in relation to germ cells of other teleosts are discussed.en
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias Botucatu, Dept Morfol, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias Botucatu, Dept Morfol, BR-18618000 Botucatu, SP, Brazil
dc.format.extent287-293
dc.identifierhttp://dx.doi.org/10.1017/S0952836902000882
dc.identifier.citationJournal of Zoology. New York: Cambridge Univ Press, v. 257, p. 287-293, 2002.
dc.identifier.doi10.1017/S0952836902000882
dc.identifier.issn0952-8369
dc.identifier.lattes0804793944846367
dc.identifier.urihttp://hdl.handle.net/11449/18354
dc.identifier.wosWOS:000177482200002
dc.language.isoeng
dc.publisherCambridge University Press
dc.relation.ispartofJournal of Zoology
dc.relation.ispartofjcr1.955
dc.relation.ispartofsjr1,077
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectultrastructurept
dc.subjectspermatogenesispt
dc.subjectfishpt
dc.subjectTeleosteipt
dc.subjectCharaciformespt
dc.subjectHoplias malabaricuspt
dc.titleSpermatogonia and spermatocyte ultrastructure in Hoplias malabaricus (Teleostei, Characiformes : Erythrinidae)en
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderCambridge Univ Press
unesp.author.lattes0804793944846367
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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