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Licensed Unlicensed Requires Authentication Published by De Gruyter April 13, 2018

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

Georgii A. Kremnev and Sergei V. Shchenkov
From the journal Acta Parasitologica


Morphology of the daughter sporocysts of Cercaria etgesiiShchenkov, 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).

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


The work was performed at the Research park of St. Petersburg State University ‘Center for Molecular and Cell Technologies’. Authors are grateful to Dr. A. A. Dobrovolskij (St. Petersburg State University, department of Invertebrate zoology) for his advising during the writing of manuscript.


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Received: 2017-12-4
Revised: 2018-1-26
Accepted: 2018-1-30
Published Online: 2018-4-13
Published in Print: 2018-6-26

© 2018 W. Stefański Institute of Parasitology, PAS

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