Spermatological characters in the diphyllobothriidean Schistocephalus solidus (Cestoda)

0396992 - BC 2014 RIV AU eng J - Journal Article
Levron, Céline - Yoneva, Aneta - Kalbe, M.
Spermatological characters in the diphyllobothriidean Schistocephalus solidus (Cestoda).
Acta Zoologica. Roč. 94, č. 2 (2013), s. 240-247. ISSN 0001-7272. E-ISSN 1463-6395
R&D Projects: GA ČR GAP506/10/1994; GA ČR GAP506/12/1632; GA ČR GBP505/12/G112
Institutional support: RVO:60077344
Keywords : ultrastructure * spermiogenesis * spermatozoon * Schistocephalus solidus * Diphylllobothriidae
Subject RIV: EA - Cell Biology
Impact factor: 1.296, year: 2013

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 Bâ and Marchand (Mémoires du Muséum 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.
Permanent Link: http://hdl.handle.net/11104/0224655