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Sperm ultrastructure in two species of Brachidontes (Bivalvia, Mytilidae) from the south-western Atlantic Ocean

Published online by Cambridge University Press:  09 February 2015

María Eugenia Torroglosa  and
Juliana Giménez
María Eugenia Torroglosa
Affiliation:
Instituto de Biodiversidad y Biología Experimental y Aplicada, IBBEA, CONICET-UBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA, Argentina
Juliana Giménez*
Affiliation:
Instituto de Biodiversidad y Biología Experimental y Aplicada, IBBEA, CONICET-UBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA, Argentina
*
Correspondence should be addressed to: J. Giménez, Instituto de Biodiversidad y Biología Experimental y Aplicada, IBBEA, CONICET-UBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA, Argentina email: [email protected]
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Abstract

Brachidontes rodriguezii and Brachidontes purpuratus have a wide geographic distribution along the Argentinean coast. Both species are abundant in the intertidal area of rocky shores. We used transmission electron microscopy to study the spermatogenesis of B. rodriguezii and the structure of mature spermatozoa from B. rodriguezii and B. purpuratus. Our results show that spermatogenesis in B. rodriguezii is very similar to that reported in other mytilids. The spermatozoa of both Brachidontes are of the primitive or ect-aquasperm type showing a spherical nucleus capped by a conical acrosome with an anterior extension. The chromatin was electron-dense, homogeneous and compact. The mid-piece region consisted of 5 spherical mitochondria grouped in a ring around a pair of short cylindrical centrioles. The flagellum exhibit the typical 9 + 2 microtubule structure. Studies of spermatozoa ultrastructure are considered a useful tool in bivalve phylogeny. Characters in the spermatozoa morphology of these two species were observed and a brief discussion about the sperm morphology along the distribution of both species is presented. We suggest that the acrosome complex presents the most significant differences between both species.

Keywords

Brachidontes rodrigueziiBrachidontes purpuratusspermatozoaacrosomal complexintertidal
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 95 , Issue 5 , August 2015 , pp. 991 - 998
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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