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Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

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Abstract

The ultrastructure of the uterus proper of the aspidogastrean Aspidogaster limacoides Diesing, 1835 and two digenean species, Phyllodistomum angulatum Linstow, 1907 (Plagiorchiida, Gorgoderidae) and Azygia lucii (Müller, 1776) (Strigeida, Azygiidae), was examined by transmission electron microscopy (TEM). The uterine epithelial lining of these species is thin, except for the perinuclear region of the epithelial cells. Septate junctions occur between adjacent epithelial cells within the uterine wall. The luminal surface of the cells is elevated into microlamellae, which project into the uterine lumen and cover the entire epithelial lining. Basally the uterine epithelium is attached to a basal matrix, and its supporting layers of muscle fibres are weak and composed of scattered circular muscles. Despite the marked similarity in the ultrastructural pattern of the aspidogastrean and two digeneans studied, there is some degree of variation in the secretory activity of their uterine epithelium. The high level of vesicular exocytotic activity in the epithelial cytoplasm of A. lucii may be associated with differences in egg emission and the subsequent life cycle involving a non-ciliated, non-swimming and non-free-living miracidium, as opposed to the free-swimming miracidium of P. angulatum. The similar nature of the uterine epithelium in all three species studied represents an ultrastructural marker possibly supporting a close phylogenetic relationship between the Aspidogastrea and the Digenea.

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Authors and Affiliations

  1. Institute of Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Yaroslavl Province, Russia

    Larisa G. Poddubnaya

  2. Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic

    Céline Levron

  3. Department of Zoology, Natural History Museum, Cromwell Road, London, SW7 5BD, UK

    David I. Gibson

Authors
  1. Larisa G. Poddubnaya
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  2. Céline Levron
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  3. David I. Gibson
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Correspondence to Larisa G. Poddubnaya.

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Poddubnaya, L.G., Levron, C. & Gibson, D.I. Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes. Acta Parasit. 56, 131–139 (2011). https://doi.org/10.2478/s11686-011-0016-z

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  • DOI: https://doi.org/10.2478/s11686-011-0016-z

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