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Ultrastructure of Thunnus thynnus and Euthynnus allettevatus spermatozoa

Identifieur interne : 000504 ( Istex/Corpus ); précédent : 000503; suivant : 000505

Ultrastructure of Thunnus thynnus and Euthynnus allettevatus spermatozoa

Auteurs : F. J. Abascal ; A. Medina ; C. Megina ; A. Calzada

Source :

RBID : ISTEX:228933976173DF1BAB5FF3960D245BB34CD783B0

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

Links to Exploration step

ISTEX:228933976173DF1BAB5FF3960D245BB34CD783B0

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<dateIssued encoding="w3cdtf">2002-01</dateIssued>
<edition>(Received 7 April 2001, Accepted 23 October 2001)</edition>
<copyrightDate encoding="w3cdtf">2002</copyrightDate>
</originInfo>
<language>
<languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
</language>
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<extent unit="references">12</extent>
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<abstract lang="en">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.</abstract>
<subject lang="en">
<genre>Keywords</genre>
<topic>sperm ultrastructure</topic>
<topic>Scombridae</topic>
<topic>Thunnus thynnus</topic>
<topic>Euthynnus alletteratus</topic>
</subject>
<relatedItem type="host">
<titleInfo>
<title>Journal of Fish Biology</title>
</titleInfo>
<identifier type="ISSN">0022-1112</identifier>
<identifier type="eISSN">1095-8649</identifier>
<identifier type="DOI">10.1111/(ISSN)1095-8649</identifier>
<identifier type="PublisherID">JFB</identifier>
<part>
<date>2002</date>
<detail type="volume">
<caption>vol.</caption>
<number>60</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>1</number>
</detail>
<extent unit="pages">
<start>147</start>
<end>153</end>
<total>7</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">228933976173DF1BAB5FF3960D245BB34CD783B0</identifier>
<identifier type="DOI">10.1111/j.1095-8649.2002.tb02394.x</identifier>
<identifier type="ArticleID">JFB147</identifier>
<recordInfo>
<recordOrigin>Blackwell Publishing Ltd</recordOrigin>
<recordContentSource>WILEY</recordContentSource>
</recordInfo>
</mods>
</metadata>
<serie></serie>
</istex>
</record>

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