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Morphology of the rediae of Echinostoma paraensei (Trematoda: Echinostomatidae) from its intermediate host Lymnaea columella (Mollusca, Gastropoda)

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Abstract

The morphology of the rediae of Echinostoma paraensei obtained from Lymnaea columella was studied using light, scanning and transmission electron microscopy. The measurements of the mature rediae differ from those described originally, and the taxonomic importance of the ambulatory buds and papilliform process is discussed. Uniciliated papillae were observed in the mouth region. The birth papilla is a bulb-like structure, well defined at the anterior end of the body of the rediae, which opens through a split. There are no microvilli in the tegument surface of the larvae, but numerous tegumental folds, varying according to the contraction of the body of the rediae. The outer syncytial layer is located on a thick basal lamina below which the circular and the longitudinal muscle fiber layers are located.

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Fig. 1a, b
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Acknowledgements

We thank Mr. Sebastião da Cruz, Laboratório de Ultraestrutura Celular Hertha Meyer, UFRJ, RJ, Brazil, for technical support in electron microscopy and Miss Aleksandra de Oliveira Menezes, Laboratório de Biologia de Helmintos Otto Wucherer, Universidade Federal do Rio de Janeiro, for valuable suggestions. This work was supported by: Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro, Fundação Universitária José Bonifácio and Programa de Núcleos de Excelência.

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Authors and Affiliations

  1. Instituto de Biologia, Departamento de Ciências Fisiológicas, Universidade Federal Rural do Rio de Janeiro, km7, BR465, Seropédica, 23.890-000, Rio de Janeiro, RJ, Brazil

    J. Pinheiro

  2. Departamento de Medicina Tropical, Laboratório de Biologia e Controle da Equistossomose, Instituto Oswaldo Cruz, Av. Brasil 4365, 21.045-900, Rio de Janeiro, RJ, Brazil

    A. Maldonado Júnior

  3. Laboratório de Ultraestrutura Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS, Bloco G, Ilha do Fundão, 21.949-900, Rio de Janeiro, RJ, Brazil

    M. Attias

  4. Laboratório de Biologia de Helmintos Otto Wucherer, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS, Bloco G, Ilha do Fundão, 21.949-900, Rio de Janeiro, RJ, Brazil

    R. M. Lanfredi

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  1. J. Pinheiro
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  2. A. Maldonado Júnior
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  4. R. M. Lanfredi
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Correspondence to R. M. Lanfredi.

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Pinheiro, J., Maldonado Júnior, A., Attias, M. et al. Morphology of the rediae of Echinostoma paraensei (Trematoda: Echinostomatidae) from its intermediate host Lymnaea columella (Mollusca, Gastropoda). Parasitol Res 93, 171–177 (2004). https://doi.org/10.1007/s00436-004-1110-z

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