Ultrastructure of Thunnus thynnus and Euthynnus allettevatus spermatozoa
Identifieur interne : 000B15 ( Main/Exploration ); précédent : 000B14; suivant : 000B16Ultrastructure of Thunnus thynnus and Euthynnus allettevatus spermatozoa
Auteurs : F. J. Abascal [Espagne] ; A. Medina [Espagne] ; C. Megina [Espagne] ; A. Calzada [Espagne]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2002-01.
English descriptors
Abstract
The spermatozoa of Thunnus thynnus and Euthynnus alletteratus consist of an acrosome‐less head (comprising the ovoid nucleus and the short midpiece) and a long flagellar tail that contains the conventional 9 + 2 axoneme and lacks lateral fins. The centrioles are arranged at approximately right angles and lie outside of a shallow nuclear groove. The flagellum inserts laterally on the nucleus, therefore the spermatozoon is asymmetrical. The midpiece contains a few mitochondria which are separated from the axoneme by the cytoplasmic canal; they are spherical in T. thynnus and elongate, somewhat irregular in E. alletteratus. Although the main ultrastructural characteristics of the spermatozoa appear to indicate a great homogeneity in the sperm morphology within the family Scombridae, small species‐specific divergences may be of use in systematics.
Url:
DOI: 10.1111/j.1095-8649.2002.tb02394.x
Affiliations:
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The centrioles are arranged at approximately right angles and lie outside of a shallow nuclear groove. The flagellum inserts laterally on the nucleus, therefore the spermatozoon is asymmetrical. The midpiece contains a few mitochondria which are separated from the axoneme by the cytoplasmic canal; they are spherical in T. thynnus and elongate, somewhat irregular in E. alletteratus. Although the main ultrastructural characteristics of the spermatozoa appear to indicate a great homogeneity in the sperm morphology within the family Scombridae, small species‐specific divergences may be of use in systematics.</div></front></TEI><affiliations><list><country><li>Espagne</li></country></list><tree><country name="Espagne"><noRegion><name sortKey="Abascal, F J" sort="Abascal, F J" uniqKey="Abascal F" first="F. J." last="Abascal">F. J. Abascal</name></noRegion><name sortKey="Calzada, A" sort="Calzada, A" uniqKey="Calzada A" first="A." last="Calzada">A. Calzada</name><name sortKey="Medina, A" sort="Medina, A" uniqKey="Medina A" first="A." last="Medina">A. Medina</name><name sortKey="Megina, C" sort="Megina, C" uniqKey="Megina C" first="C." last="Megina">C. Megina</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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