The structure of the coating surrounding the metacercaria of Cryptocotyle lingua in the skin and the metacercaria of Liliatrema skrjabini in the muscles of the stone cockscomb was studied. Metacercariae of these trematodes were surrounded by a cyst adjacent to the helminth and by a capsule. In both species, the cyst consisted of electron- dense homogeneous material, which was probably synthesized by the parasite. The capsules were formed from host tissues; in C. lingua, they mostly consisted of ordered layers of collagen fibers and in L. skrjabini they were formed from fibroblasts and, presumably, phagocytes. The differences in capsule structure of the studied metacercariae may be related to the physiological features of surrounding tissues or to the taxonomic attribution of the trematodes.
Russian Journal of Marine Biology – Springer Journals
Published: May 10, 2009
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