Ultraestructura dels espermatozoides de Crassostrea gigas, Mytilus galloprovincialis i Donax trunculus (Mollusca, Bivalvia) Authors Maria Gràcia Bozzo Duran Montserrat Poquet i Miquel Elena Sagristà i Mateo Mercè Durfort i Coll Abstract The majority of bivalve mollusks are gonocoric organisms, and some cases of hermaphroditic individuals have been reported in different groups. When it reaches maturity, the male gonad invades the whole of the mantle cavity and gametes are released into the pallial cavity of the individual. The spermatozoa of bivalve mollusks are of a primitive type, as those of all aquatic organisms with external fertilization. They are cells in which three clearly differentiated parts can be identified: a head, a middle piece and a tail. In all three analyzed species: Crassostrea gigas, Mytilus galloprovincialis and Donax trunculus, the spermatozoa fit within this pattern, but with specific morphological variations related to the characteristics of the oocytes they fertilize. In C. gigas, the sperm head is rounded and between the acrosome and the nucleus stands out the subacrosomal region with fibrillar components of actin. The sperm of M. galloprovincialis is much more elongated and the fibrillar system of the subacrosomal region forms an intranuclear channel. The acrosome is conspicuous because of its length. The sperm of D. trunculus fits with the pattern considered to be primitive, although the middle piece has more mitochondria and the centrioles are arranged in a line instead of being orthogonally oriented as in the other analyzed species. Downloads Download data is not yet available. Downloads Text complet (Català) Published 2009-04-24 Issue 59, 2008 : Biologia de la reproducció / Mercè Durfort i Francesca Vidal, editores Section Articles License The intellectual property of the articles belongs to the respective authors. At the time of submitting the articles to Treballs de la Societat Catalana de Biologia, authors accept the following terms: — Authors assign to the SCB (a subsidiary of the Institut d’Estudis Catalans) the rights of reproduction, public communication (including communication through social networks) and distribution of the articles submitted for publication to Treballs de la Societat Catalana de Biologia, in any form and medium, including digital platforms. The Publications Committee reserves the right to accept or refuse submitted articles and the right to make any editorial changes it deems appropriate. If the suggested changes are accepted by authors, they should re-submit the article with such changes. — Authors answer to the SCB for the authorship and originality of submitted articles. In other words, authors assure that submitted articles do not contain fragments of works by other authors or fragments of their own previously published works; that the content of articles is original, and that the copyright of third parties is not infringed upon. Authors accept this responsibility and undertake to hold harmless the SCB for any loss or damage resulting from non-compliance with this obligation. Furthermore, they should include a statement in articles submitted to the journal regarding their responsibility for the content of the articles. — Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles, and they should moreover ensure that images, videos, etc., have been created with the consent of the individuals appearing in them, and that material belonging to third parties is clearly identified and acknowledged as such within the text. Likewise, authors should provide the respective consents and authorisations to the SCB when submitting articles. — The SCB is exempt from any liability arising from the possible infringement of intellectual property rights by authors. In all cases, it undertakes to publish corrections, clarifications, retractions and apologies, if necessary. — Unless otherwise stated in the text or in the graphic material, the contents published in the journal are subject to an Attribution - NonCommercial - NoDerivs 3.0 Spain (by-nc-nd) license from Creative Commons, the full text of which may be consulted at https://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Therefore, the general public is authorised to reproduce, distribute and communicate articles as long as their authorship and publishing entity are acknowledged, and no commercial use is made of them nor derivative work produced from them. — The journal is not responsible for the ideas and opinions expressed by the authors of published articles.
