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Reinvestigation of the spermatozoon ultrastructure of the cestode Proteocephalus longicollis (Zeder, 1800), a parasite of salmonid fish

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Abstract

The reinvestigation of the fine structure of the mature spermatozoon of the proteocephalidean tapeworm Proteocephalus longicollis, a parasite of salmonid fish, has shown new characters not described previously for this species. They include a helicoidal crested body, 60–100 nm thick and localised at the anterior extremity of the spermatozoon. Also new is the finding that cortical microtubules in P. longicollis spermatozoon are of two types. The nucleus situated in the middle part of the gamete is rod-shaped anteriorly, but it is wound around one of the axonemes posteriorly. It is newly observed that both the anterior and posterior extremities of the spermatozoon of P. longicollis contain a single axoneme. The ultrastructural characteristics of the mature spermatozoon of P. longicolis coincide in their main features with those of the spermatozoon of P. torulosus, a parasite of cyprinid fish.

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Acknowledgements

The authors are grateful to Dr. Vladimíra Hanzelová, Parasitological Institute, Slovak Academy of Sciences, Košice, for providing Proteocephalus longicollis specimens and to Ladislava Nováková, Petra Masařová, Antonín Polák and Pavel Štengl for skilled technical assistance. This study was supported by the Grant Agency of the Czech Republic (projects 206/03/1317, 524/01/1314) and the Grant Agency of the Slovak Republic VEGA (project number 2/1020/21).

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  1. Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic

    Magdaléna Bruňanská, Tomáš Scholz & Jana Nebesářová

  2. Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic

    Magdaléna Bruňanská

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  1. Magdaléna Bruňanská
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  2. Tomáš Scholz
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  3. Jana Nebesářová
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Correspondence to Magdaléna Bruňanská.

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Bruňanská, M., Scholz, T. & Nebesářová, J. Reinvestigation of the spermatozoon ultrastructure of the cestode Proteocephalus longicollis (Zeder, 1800), a parasite of salmonid fish. Parasitol Res 91, 357–362 (2003). https://doi.org/10.1007/s00436-003-0977-4

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