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1 November 2014 Ultrastructure of the Spermatogenic Process in the Penshell Atrina maura (Bivalvia: Pinnidae)
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The ultrastructural features of the spermatogenic development and mature spermatozoa morphology of Atrina maura were investigated through transmission electron microscopy. The testis displays a diffuse tubular structure in which gametes develop within a concentric arrangement according to the degree of development. Within the tubules also appear Sertoli cells, which contain a large amount of lipid droplets and glycogen granules in the cytoplasm, suggesting a nutritive role in the first spermatogenesis stage (spermatogonia). Four gamete maturation stages co-occurred in the same individual: spermatogonia (4–8 μm), spermatocytes (3–4 μm) (including primary and secondary), spermatids (2.5 μm) and spermatozoa (∼ 2 μm head length). The proacrosomal vesicle and flagellum occur only until the first stages of spermiogenesis, contrasting with the early formation of both structures in spermatogonia and spermatocytes in other bivalves. In A. maura, the material in the acrosomal vesicle of mature spermatozoa shows a characteristic electron density pattern, which seems to be an exclusive taxonomic feature of the family Pinnidae. However, A. maura displayed only four mitochondria in the midpiece, contrasting with five in all other species in this family.

Marian Alejandra Camacho-Mondragón, Bertha Patricia Ceballos-Vázquez, Esther Uría Galicia, Edgar Oliver López Villegas, and Marcial Arellano-Martínez "Ultrastructure of the Spermatogenic Process in the Penshell Atrina maura (Bivalvia: Pinnidae)," Malacologia 57(2), 329-339, (1 November 2014).
Received: 9 September 2013; Accepted: 1 September 2013; Published: 1 November 2014

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