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Spermatozoa and phylogenesis of the pectinid bivalve Flexopecten glaber


, : Spermatozoa and phylogenesis of the pectinid bivalve Flexopecten glaber. Journal of the: 425-428

Gonad of the Mediterranean pectinid Flexopecten glaber was studied in order to describe the morphology 0 and the ultrastructural characteristics of the mature spermatozoa. The spermatozoon has a 2.5[mu]m pyriform head and a 40-45[mu]m flagellum. The four mitochondria of the mid-piece are 0.6[mu]m in diameter. The nucleus contains dense chromatin fibres and possesses two depressions: a wide (0.19[mu]m) and deep (0.581[mu]m) sub-acrosomal one, and the other at the base of the head, less deep (0.361[mu]m) and less wide (0.12[mu]m). The objective was to situate this scallop in the phylogenetic diagrams found in the literature concerning the commercial pectinid species.

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DOI: 10.1017/S0025315406013300


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