Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)

Chondrichthyes have become an important economic resource in the last decades, with Argentina as one of the countries that exploits more sharks and skates, even at levels that exceed de limits of many species. However, there is a scarce knowledge of the reproductive biology of this group, particular...

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Autores principales:	Díaz-Andrade,M. C, Galíndez,E. J, López-Cazorla,A, Estecondo,S
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2011
Materias:	Elasmobranchs Reproduction Ovary Folliculogenesis Sympterygia bonapartii
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100030
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spelling	oai:scielo:S0717-950220110001000302011-09-21Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)Díaz-Andrade,M. CGalíndez,E. JLópez-Cazorla,AEstecondo,S Elasmobranchs Reproduction Ovary Folliculogenesis Sympterygia bonapartii Chondrichthyes have become an important economic resource in the last decades, with Argentina as one of the countries that exploits more sharks and skates, even at levels that exceed de limits of many species. However, there is a scarce knowledge of the reproductive biology of this group, particularly from species inhabiting the Southern hemisphere. This work shows the most relevant facts during folliculogenesis in Sympterygia bonapartii. Results show that germinal cells are present in immature and maturing females. The most important facts that vary along de follicular development are the number of types and layers of follicular cells, the establishment of thin projections from the follicular cells and the degree of development of the thecae. Follicular cells are, at least, of two different types and both of them emit projections that break through the zona pellucida. The outer theca shows signs of synthetic activity. Atretic follicles of different sizes are present in exemplars of all the reproductive stages. These results are discussed in a physiological and adaptive context.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.29 n.1 20112011-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100030en10.4067/S0717-95022011000100030
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Elasmobranchs Reproduction Ovary Folliculogenesis Sympterygia bonapartii
spellingShingle	Elasmobranchs Reproduction Ovary Folliculogenesis Sympterygia bonapartii Díaz-Andrade,M. C Galíndez,E. J López-Cazorla,A Estecondo,S Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
description	Chondrichthyes have become an important economic resource in the last decades, with Argentina as one of the countries that exploits more sharks and skates, even at levels that exceed de limits of many species. However, there is a scarce knowledge of the reproductive biology of this group, particularly from species inhabiting the Southern hemisphere. This work shows the most relevant facts during folliculogenesis in Sympterygia bonapartii. Results show that germinal cells are present in immature and maturing females. The most important facts that vary along de follicular development are the number of types and layers of follicular cells, the establishment of thin projections from the follicular cells and the degree of development of the thecae. Follicular cells are, at least, of two different types and both of them emit projections that break through the zona pellucida. The outer theca shows signs of synthetic activity. Atretic follicles of different sizes are present in exemplars of all the reproductive stages. These results are discussed in a physiological and adaptive context.
author	Díaz-Andrade,M. C Galíndez,E. J López-Cazorla,A Estecondo,S
author_facet	Díaz-Andrade,M. C Galíndez,E. J López-Cazorla,A Estecondo,S
author_sort	Díaz-Andrade,M. C
title	Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
title_short	Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
title_full	Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
title_fullStr	Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
title_full_unstemmed	Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae)
title_sort	ovarian folliculogenesis in the smallnose fanskate sympterygia bonapartii (müller & henle, 1841) (chondrichthyes, rajidae)
publisher	Sociedad Chilena de Anatomía
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100030
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Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller &amp; Henle, 1841) (Chondrichthyes, Rajidae)

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