caa a22 4500 445342978 CHVBK 20180317142819.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s00436-010-2144-z doi (NATIONALLICENCE)springer-10.1007/s00436-010-2144-z Ultrastructure of spermiogenesis and mature spermatozoon of Breviscolex orientalis (Cestoda: Caryophyllidea) [Elektronische Daten] [Aneta Yoneva, Céline Levron, Mikuláš Oros, Martina Orosová, Tomáš Scholz] Spermiogenesis and spermatozoon ultrastructure of the caryophyllidean cestode Breviscolex orientalis Kulakovskaya, 1962, first member of the family Capingentidae studied, a parasite of cyprinid fish Abbottina rivularis, are described using transmission electron microscopy. Spermiogenesis in B. orientalis follows the Type II pattern described by Bâ and Marchand (Mém Mus Natl Hist Nat 166:87-95, 1995) for cestodes. It begins with the formation of a zone of differentiation containing a large nucleus and a pair of centrioles. The centrioles are separated from one another by an intercentriolar body composed of three electron-dense layers. Each centriole is associated with typical striated roots. At the beginning of the spermiogenesis, an electron-dense material is observed in the apical region of the differentiation zone. During the initial stage of spermiogenesis, one of the centrioles gives rise to a free flagellum, which then rotates and undergoes proximodistal fusion with the cytoplasmic protrusion of the differentiation zone. The mature spermatozoon of B. orientalis corresponds to the Type III pattern described by Levron et al. (Biol Rev 85:523-543, 2010). It is characterized by the absence of mitochondrion and crested body. Five regions of the mature spermatozoon are differentiated. The main ultrastructural characteristics are: one axoneme of 9 + "1” trepaxonematan pattern, cortical microtubules and nucleus. The comparison of the spermiogenesis of B. orientalis with those of the other caryophyllidean species demonstrates some variation within the order relative to the presence and morphology of the intercentriolar body, the presence of slight rotation of the flagellar bud and a complete proximodistal fusion of the free flagellum with a cytoplasmic protrusion. Springer-Verlag, 2010 Yoneva Aneta Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113, Sofia, Bulgaria aut Levron Céline Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic aut Oros Mikuláš Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic aut Orosová Martina Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic aut Scholz Tomáš Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic aut Parasitology Research Springer-Verlag 108/4(2011-04-01), 997-1005 0932-0113 108:4<997 2011 108 436 https://doi.org/10.1007/s00436-010-2144-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00436-010-2144-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yoneva Aneta Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Levron Céline Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic aut NATIONALLICENCE 700 1- Oros Mikuláš Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic aut NATIONALLICENCE 700 1- Orosová Martina Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic aut NATIONALLICENCE 700 1- Scholz Tomáš Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic aut NATIONALLICENCE 773 0- Parasitology Research Springer-Verlag 108/4(2011-04-01), 997-1005 0932-0113 108:4<997 2011 108 436 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer