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Acta Parasitologica

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Volume 63, Issue 2


Histological description of Cercaria etgesii Shchenkov, 2017 daughter sporocysts (Trematoda: Pleurogenidae): compartmentalization of the brood cavity and germinal mass morphology

Georgii A. Kremnev
  • Corresponding author
  • Saint-Petersburg State University, department of Invertebrate zoology, 7/9 Universitetskaya Emb., 199034, Saint Petersburg, Russia
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Sergei V. Shchenkov
  • Saint-Petersburg State University, department of Invertebrate zoology, 7/9 Universitetskaya Emb., 199034, Saint Petersburg, Russia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2018-04-13 | DOI: https://doi.org/10.1515/ap-2018-0036


Morphology of the daughter sporocysts of Cercaria etgesii Shchenkov, 2017 (Pleurogenidae) has been described according to conventional histological techniques and subsequent 3D reconstruction with Bitplanelmaris® software. Novel data were obtained concerning the spatial organization of the brood cavity of Pleurogenidae daughter sporocysts. It was shown that the laminated structures of the endocyst are lining the brood cavity and carry out its compartmentalisation by formation of the chambers around developing and disintegrating embryos of cercariae. First description of the germinal mass of the Pleurogenidae daughter sporocysts is given. No mitoses in germinal mass were evident although apparent production of the cercariae embryos by the sporocysts take place. The analogous principle of daughter sporocysts morphofunctional organisation was noted for the studied representatives of closely related taxa of trematodes: Pleurogenidae (C. etgesii) and Microphallidae (Microphallus ‘pygmaeus’ group).

Keywords: Cercaria etgesii; Bithynia tentaculata; daughter sporocysts; germinal mass; embryos development; endocyst


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About the article

Received: 2017-12-04

Revised: 2018-01-26

Accepted: 2018-01-30

Published Online: 2018-04-13

Published in Print: 2018-06-26

Conflict of interest: The authors declare that they have no competing interests.

Citation Information: Acta Parasitologica, Volume 63, Issue 2, Pages 317–324, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2018-0036.

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