Spermiogenesis and spermatozoon of the tapeworm Parabothriocephalus gracilis (Bothriocephalidea): Ultrastructural and cytochemical studies

0342872 - BC 2011 RIV PL eng J - Journal Article
Šípková, Lenka - Levron, Céline - Freeman, M. - Scholz, Tomáš
Spermiogenesis and spermatozoon of the tapeworm Parabothriocephalus gracilis (Bothriocephalidea): Ultrastructural and cytochemical studies.
Acta Parasitologica. Roč. 55, č. 1 (2010), s. 58-65. ISSN 1230-2821. E-ISSN 1896-1851
R&D Projects: GA ČR GP524/07/P039; GA ČR GA524/08/0885; GA MŠMT LC522
Institutional research plan: CEZ:AV0Z60220518
Keywords : Eucestoda * Bothriocephalidea * Parabothriocephalus gracilis * spermiogenesis * spermatozoon * ultrastructure
Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine
Impact factor: 1.144, year: 2010

Spermiogenesis of the tapeworm Parabothriocephalus gracilis is characterized by the formation of a zone of differentiation with two centrioles associated with striated rootlets, and an intercentriolar body between them. The two flagella undergo a rotation of 90 until they become parallel to the median cytoplasmic extension with which they fuse. Electron-dense material is present in the apical region of the zone of differentiation in the early stages of spermiogenesis. The mature spermatozoon contains two axonemes of the 9 + '1' trepaxonematan pattern, nucleus, parallel cortical microtubules and electron-dense granules of glycogen. The anterior extremity of the spermatozoon exhibits a single helical electron-dense crested body 130 nm thick. One of the most interesting features is the presence of a ring of cortical microtubules surrounding the axoneme. This character has been reported only for species of the order Bothriocephalidea and may be unique in this cestode group.
Permanent Link: http://hdl.handle.net/11104/0185485