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Reproduction of Echinostoma caproni mother sporocysts (Trematoda)


The localisation and the composition of germinal material in miracidia and mother sporocysts of Echinostoma caproni were studied with the use of histological and electron microscopic methods. Germinal material in miracidia was localised in the posterior body half and was represented by 3–4 undifferentiated cells and 5–7 germinal cells. Taken together, these cells are referred to as the primordium of the germinal mass. In the mother sporocyst, germinal elements also form and develop in the germinal mass, which is located caudally. It comprises undifferentiated cells and germinal cells as well as embryos of various ages (up to the stage of 30–50 blastomeres). Germinal cells divide only by cleavage. New germinal cells are formed only from undifferentiated cells, which can proliferate in the germinal mass and nowhere else. This indicates that the germinal mass is the reproductive organ of E. caproni mother sporocyst.

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This investigation was supported financially by the Russian Foundation for Basic Research (grant 16−04−00793a) and the Ministry of Education and Science of Russia (grant 6.7509.2017/8.9).

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Correspondence to G. L. Ataev.

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Ataev, G.L., Tokmakova, A.S. Reproduction of Echinostoma caproni mother sporocysts (Trematoda). Parasitol Res 117, 2419–2426 (2018).

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  • Echinostoma caproni
  • Reproduction
  • Mother sporocyst
  • Germinal mass
  • Germinal cells
  • Undifferentiated cells