Sperm ultrastructure and a new type of spermiogenesis in two species of Pimelodidae, with a comparative review of sperm ultrastructure in Siluriformes (Teleostei : Ostariophysi)

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dc.contributor.authorQuagio-Grassiotto, Irani [UNESP]
dc.contributor.authorOliveira, Claudio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:33:45Z
dc.date.available2014-05-20T15:33:45Z
dc.date.issued2008-01-01
dc.description.abstractDuring spermiogenesis, the spermatids of the pimelodid species Pimelodus maculatus and Pseudoplatystoma fasciatum show a central flagellum development, no rotation of the nucleus, and no nuclear fossa formation, in contrast to all previously described spermatids of Teleostei. These characteristics are interpreted as belonging to a new type of spermiogenesis, named here type III, which is peculiar to the family Pimelodidae. In P. maculatus and P. fasciatum, spermatozoa possess a spherical head and no acrosome; their nucleus contains highly condensed, homogeneous chromatin with small electron-lucent areas; and a nuclear fossa is not present. The centriolar complex lies close to the nucleus. The midpiece is small, has no true cytoplasmic channel, and contains many elongate and interconnected vesicles. Several spherical to oblong mitochondria are located around the centriolar complex. The flagellum displays the classical axoneme (9 + 2) and no lateral fins. Only minor differences were observed among the pimelodid species and genera. Otherwise, spermiogenesis and spermatozoa in the two species of Pimelodidae studied exhibit many characteristics that are not found in other siluriform families, mainly the type III spermiogenesis. (C) 2007 Elsevier GmbH. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Morfol, BR-18618000 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Morfol, BR-18618000 São Paulo, Brazil
dc.format.extent55-66
dc.identifierhttp://dx.doi.org/10.1016/j.jcz.2007.07.002
dc.identifier.citationZoologischer Anzeiger. Jena: Elsevier Gmbh, Urban & Fischer Verlag, v. 247, n. 1, p. 55-66, 2008.
dc.identifier.doi10.1016/j.jcz.2007.07.002
dc.identifier.issn0044-5231
dc.identifier.urihttp://hdl.handle.net/11449/42291
dc.identifier.wosWOS:000254628800005
dc.language.isoeng
dc.publisherElsevier Gmbh, Urban & Fischer Verlag
dc.relation.ispartofZoologischer Anzeiger
dc.relation.ispartofjcr1.345
dc.relation.ispartofsjr0,623
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectcatfishen
dc.subjectspermatiden
dc.subjectspermen
dc.subjectmorphologyen
dc.subjectevolutionen
dc.subjectTeleosteien
dc.titleSperm ultrastructure and a new type of spermiogenesis in two species of Pimelodidae, with a comparative review of sperm ultrastructure in Siluriformes (Teleostei : Ostariophysi)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier Gmbh, Urban & Fischer Verlag
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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