SciELO - Scientific Electronic Library Online

vol.29 número1Aspectos Anatómicos y Topográficos del Nervio Pudendo en la Región GlúteaVariación del Origen de las Ramas del Arco Aórtico: Relación con Placas de Ateromas índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados


International Journal of Morphology

versión On-line ISSN 0717-9502


DIAZ-ANDRADE, M. C; GALINDEZ, E. J; LOPEZ-CAZORLA, A  y  ESTECONDO, S. Ovarian Folliculogenesis in the Smallnose Fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae). Int. J. Morphol. [online]. 2011, vol.29, n.1, pp.174-181. ISSN 0717-9502.

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.

Palabras clave : Elasmobranchs; Reproduction; Ovary; Folliculogenesis; Sympterygia bonapartii.

        · resumen en Español     · texto en Inglés     · Inglés ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons