caa a22 4500 445340304 CHVBK 20180317142810.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00436-011-2327-2 doi (NATIONALLICENCE)springer-10.1007/s00436-011-2327-2 Spermiogenesis and spermatozoon ultrastructure of the diphyllidean cestode Echinobothrium euterpes (Neifar, Tyler and Euzet 2001) Tyler 2006, a parasite of the common guitarfish Rhinobatos rhinobatos [Elektronische Daten] [Adji Marigo, Catarina Eira, Cheikh Bâ, Jordi Miquel] Spermiogenesis and the ultrastructural characters of the spermatozoon of Echinobothrium euterpes are described by means of transmission electron microscopy, including cytochemical analysis for glycogen. Materials were obtained from a common guitarfish Rhinobatos rhinobatos caught in the Gulf of Gabès (Tunisia). Spermiogenesis in E. euterpes is characterized by the orthogonal development of two unequal flagella followed by the flagellar rotation and the proximodistal fusion of these flagella with the median cytoplasmic process. The most interesting pattern characterizing the diphyllidean cestodes is the presence of a triangular body constituted by fines and dense granules without visible striation and assimilated at the striated rootlets. This pattern, only related in the Diphyllidea cestodes may be a synapomorphy of this order. Spermiogenesis is also characterized by the presence of a very short flagellum (around 1μm long), observed in all the stages of spermiogenesis. This type of flagellum has never been commented in the diphyllidean cestodes and should be considered as an evolved character in this group. In the latest stage of spermiogenesis, this short axoneme probably degenerates. Thus, the mature spermatozoon of E. euterpes possesses only one axoneme of 9 + "1” trepaxonematan pattern. It also exhibits a single helical electron-dense crested body, a spiraled nucleus, few parallel cortical microtubules, and α-glycogen granules. Similitudes and differences between spermatozoa of diphyllideans are discussed. Springer-Verlag, 2011 Marigo Adji Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, E08028, Barcelona, Spain aut Eira Catarina CESAM & Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Bâ Cheikh Laboratoire de Parasitologie, Département de Biologie Animale, Faculté des Sciences, Université Cheikh Anta Diop de Dakar, Dakar, Senegal aut Miquel Jordi Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, E08028, Barcelona, Spain aut Parasitology Research Springer-Verlag 109/3(2011-09-01), 809-821 0932-0113 109:3<809 2011 109 436 https://doi.org/10.1007/s00436-011-2327-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00436-011-2327-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Marigo Adji Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, E08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Eira Catarina CESAM & Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 700 1- Bâ Cheikh Laboratoire de Parasitologie, Département de Biologie Animale, Faculté des Sciences, Université Cheikh Anta Diop de Dakar, Dakar, Senegal aut NATIONALLICENCE 700 1- Miquel Jordi Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, E08028, Barcelona, Spain aut NATIONALLICENCE 773 0- Parasitology Research Springer-Verlag 109/3(2011-09-01), 809-821 0932-0113 109:3<809 2011 109 436 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer