Ultrastructure of the spermatogenesis of the cockle Anadara granosa L. (Bivalvia: Arcidae) |
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Authors: | J Suwanjarat |
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Institution: | (1) Department of Biology, Faculty of Science, Prince of Songkla University, Hat-Yai 90110 Thailand, TH |
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Abstract: | In this paper spermatogenesis and sperm ultrastructure of the cockle Anadara granosa are studied using transmission electron microscopy. The spermatocyte presents electron-dense vesicles and the arising axoneme
that begins to form the flagellum. During spermatid differentiation, proacrosomal vesicles appear to migrate towards the presumptive
anterior pole of the nucleus; eventually these vesicles become acrosome. The spermatozoon of Anadara granosa is of the primitive type. The acrosome, situated at the apex of the nucleus, is cap-shaped and deeply invaginated at the inner
side. The spherical nucleus of the spermatozoon contains dense granular chromatin and shows invagination at the posterior
poles. The centriole shows the classic nine triplets of microtubules. The middle piece consists of the centriolar complex
surrounded by five giant mitochondria. It is shown that the ultrastructure of spermatozoa and spermiogenesis of Anadara granosa reveals a number of features that are common among bivalves.
Received: 29 September 1998 / Received in revised form: 20 May 1999 / Accepted: 14 June 1999 |
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Keywords: | Anadara granosa Arcidae Spermatogenesis Spermiogenesis |
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