Spermiogenesis and sperm ultrastructure of adult Cyathocephalus truncatus, a member of presumably basal group of “true” cestodes (Eucestoda), have been examined for the first time by using transmission electron microscopy. The process of sperm formation corresponds in basic pattern to that of the Pseudophyllidea. In addition, the 2 pairs of electron-dense attachment zones are present in median cytoplasmic process of C. truncatus. However, mature spermatozoa of C. truncatus differ significantly from those of the pseudophyllideans, especially in the morphology of the proximal and distal spermatozoon extremities. The proximal extremity of the mature spermatozoon lacks a crested body, which is present in more derived cestodes and some pseudophyllideans. The distal end of the mature spermatozoa exhibits different morphology in the gametes from testes and those from receptaculum seminis. New for the Eucestoda is a finding that a lateral cytoplasmic extension creates the distal end of the spermatozoa from testes, resembling sperm of some Monogenea and Digenea. In contrast, the distal extremity of the spermatozoa from receptaculum seminis contains only a nucleus. Despite the above-mentioned peculiarities, the ultrastructural data on sperm/spermiogenesis suggest close relationships of the Spathebothriidea and Pseudophyllidea.
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October 2006
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October 01 2006
SPERMIOGENESIS AND SPERM ULTRASTRUCTURE OF CYATHOCEPHALUS TRUNCATUS (PALLAS, 1781) KESSLER, 1868 (CESTODA: SPATHEBOTHRIIDEA)
Magdaléna Bruňanská;
Magdaléna Bruňanská
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. brunan@paru.cas.cz
* Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01 Košice, Slovak Republic
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Tomáš Scholz;
Tomáš Scholz
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. brunan@paru.cas.cz
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Bahram S. Dezfuli;
Bahram S. Dezfuli
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. brunan@paru.cas.cz
† Department of Biology, University of Ferrara, St. Borsari, 46, 44100 Ferrara, Italy
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Larisa G. Poddubnaya
Larisa G. Poddubnaya
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic. brunan@paru.cas.cz
‡ Institute of Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Yaroslavl Province, Russia
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J Parasitol (2006) 92 (5): 884–892.
Citation
Magdaléna Bruňanská, Tomáš Scholz, Bahram S. Dezfuli, Larisa G. Poddubnaya; SPERMIOGENESIS AND SPERM ULTRASTRUCTURE OF CYATHOCEPHALUS TRUNCATUS (PALLAS, 1781) KESSLER, 1868 (CESTODA: SPATHEBOTHRIIDEA). J Parasitol 1 October 2006; 92 (5): 884–892. doi: https://doi.org/10.1645/GE-718R1.1
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