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  Spermatological characters in the diphyllobothriidean Schistocephalus solidus (Cestoda)

Levron, C., Yoneva, A., & Kalbe, M. (2013). Spermatological characters in the diphyllobothriidean Schistocephalus solidus (Cestoda). Acta Zoologica (Stockholm), 94(2), 240-247. doi:10.1111/j.1463-6395.2011.00549.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-F597-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-F598-4
Genre: Journal Article

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 Creators:
Levron, Céline, Author
Yoneva, Aneta, Author
Kalbe, Martin1, Author              
Affiliations:
1Research Group Parasitology, Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445643              

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Free keywords: ultrastructure; spermiogenesis; spermatozoon; Schistocephalus solidus; Diphyllobothriidea
 Abstract: The spermiogenesis and the mature spermatozoon of Schistocephalus solidus (Cestoda: Diphyllobothriidea) are described using transmission electron microscopy. Spermiogenesis in S. solidus begins with the formation in the spermatid of a differentiation zone surrounded by cortical microtubules and delimited by arching membranes. This conical area presents two centrioles associated with striated rootlets and a median cytoplasmic extension between them. The centrioles are separated by an intercentriolar body composed of three electron-dense plates dividing four electron-lucent plates. The centrioles give rise to two flagella that undergo a rotation and later fuse proximodistally with the median cytoplasmic expansion. The presence of an electron-dense material in the distal part of the differentiation zone is observed in the early stage of spermiogenesis. This pattern corresponds to Type I spermiogenesis according to the classification proposed by Baˆ and Marchand (Me´moires du Muse´um National d’Histoire Naturelle 1995; 166: 87). The mature spermatozoon of S. solidus presents the Type I pattern defined by Levron et al. (Biological Reviews 2010; 85: 523). It consists of five regions that exhibit two axonemes, parallel cortical microtubules, nucleus and electron-dense zones. The anterior tip of the spermatozoon possesses only a few singlets. The axonemes are of a 9 + ’1’ trepaxonematan pattern and do not reach the posterior extremity of the mature spermatozoon.

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Language(s): eng - English
 Dates: 2011-11-012013-04
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: DOI: 10.1111/j.1463-6395.2011.00549.x
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Title: Acta Zoologica (Stockholm)
Source Genre: Journal
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Publ. Info: Wiley-Blackwell
Pages: - Volume / Issue: 94 (2) Sequence Number: - Start / End Page: 240 - 247 Identifier: ISSN: 0001-7272 (print)
ISSN: 1463-6395 (online)