caa a22 4500 445341874 CHVBK 20180317142815.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s00436-010-2038-0 doi (NATIONALLICENCE)springer-10.1007/s00436-010-2038-0 Ultrastructural aspects of spermatogenesis, testes, and vas deferens in the parthenogenetic tapeworm Atractolytocestus huronensis Anthony, 1958 (Cestoda: Caryophyllidea), a carp parasite from Slovakia [Elektronische Daten] [Magdaléna Bruňanská, Jana Nebesářová, Mikuláš Oros] Spermatogenesis, testes, and vas deferens in the parthenogenetic monozoic tapeworm Atractolytocestus huronensis Anthony, 1958 (Cestoda: Caryophyllidea) from Slovakia, parasitizing the carp Cyprinus carpio L., have been investigated by means of transmission electron microscopy for the first time. The present results show that helminths with parthenogenetic and normal reproduction may share some common spermatology features, e.g., dense cytoplasm of the peripherally localized spermatogonia or a rosette type of spermatogenesis. In contrast to tapeworms with normal reproduction, the most prominent ultrastructural characteristic of the spermatocytes of A. huronensis is fragmentation of their nuclei. This clear feature of cell degeneration might be a consequence of the aberrant first meiotic division. Peripheral cortical microtubules and a single centriole, indicators of the ongoing spermiogenesis, were observed only very rarely in the early spermatids. Characteristics of normal spermiogenesis, i.e., apical dense material in the zone of differentiation in early stages of spermiogenesis, flagellar rotation, and proximo-distal fusion, were never found in the present study. The testes follicles are surrounded by a thin cytoplasmic sheath underlined by a basal lamina. Vas deferens is lined by flat epithelium with numerous surface lamellae and cilia. Mature, functional spermatozoa were not observed in the vas deferens of A. huronensis from Slovakia. Springer-Verlag, 2010 Bruňanská Magdaléna Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic aut Nebesářová Jana 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 Parasitology Research Springer-Verlag 108/1(2011-01-01), 61-68 0932-0113 108:1<61 2011 108 436 https://doi.org/10.1007/s00436-010-2038-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00436-010-2038-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bruňanská Magdaléna Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic aut NATIONALLICENCE 700 1- Nebesářová Jana 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 773 0- Parasitology Research Springer-Verlag 108/1(2011-01-01), 61-68 0932-0113 108:1<61 2011 108 436 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer