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Acta Parasitologica

, Volume 63, Issue 2, pp 317–324 | Cite as

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

  • Georgii A. KremnevEmail author
  • Sergei V. Shchenkov
Article

Abstract

Morphology of the daughter sporocysts of Cercaria etgesii Shchenkov, 2017 (Pleurogenidae) has been described according to conventional histological techniques and subsequent 3D reconstruction with BitplaneImaris® 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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Copyright information

© Witold Stefański Institute of Parasitology, Polish Academy of Sciences 2018

Authors and Affiliations

  1. 1.department of Invertebrate zoologySaint-Petersburg State UniversitySaint PetersburgRussia

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