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Functional morphology of the metacercarial cyst of Bucephaloides gracilescens (Trematoda: Bucephalidae)

Published online by Cambridge University Press:  06 April 2009

D. W. Halton  and
B. R. Johnston
D. W. Halton
Affiliation:
Department of Zoology, The Queen's University of Belfast, Belfast BT7 1NN
B. R. Johnston
Affiliation:
Department of Zoology, The Queen's University of Belfast, Belfast BT7 1NN
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Summary

The metacercarial cyst wall of Bucephaloides gracilescens is bilayered. It comprises an inner granular layer of pepsin-resistant carbohydrate and protein material secreted by the parasite, and an outer fibrous and cellular capsule susceptible to pepsin digestion and elaborated by the host. The capsule of cysts from the orbits and nasal regions of the whiting host are substantially thicker than those from the cranial cavity. Cells in the outer portion of the capsule resemble fibrocytes engaged in the synthesis and secretion of collagen; collagen fibres form a loose meshwork in the intercellular space. The cells incorporated [3H]proline in vitro, but not [3H]tyrosine. The cells of the inner portion of the capsule are closely packed and possess pyknotic nuclei; desmosomes and cytofilaments are numerous and probably impart strength and elasticity, respectively, to the cyst wall. Host cells are necrotic at the interface with the inner cyst wall, possibly due to compression or isolation from oxygen and nutrients. Differences in the levels of incorporation of trace-labelled substrates by encysted metacercariae were related to the site of infection and to the thickness and permeability of the cyst wall.

Type
Research Article
Information
Parasitology , Volume 85 , Issue 1 , August 1982 , pp. 45 - 52
Copyright
Copyright © Cambridge University Press 1982

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References

Higgins, J. C. (1980). Formation of the cyst wall and related changes in the structure of the tegument of Bucephalus haimeanus (Lacaze-Duthiers, 1854) during its metamorphosis from the cercarial to the metacercarial stage. Parasitology 81, 47–59.CrossRefGoogle Scholar
Higgins, J. C., Weight, D. E. & Matthews, R. A. (1977). The ultrastructure and histochemistry of the cyst wall of Bucephalus haimeanus (Lacaze-Duthiers, 1854). Parasitology 75, 205–14.CrossRefGoogle Scholar
Johnston, B. R. & Halton, D. W. (1981 a). Occurrence of Bucephaloides gracilescens meta-cercariae in three species of gadoid fish. Journal of Fish Biology 18, 685–91.CrossRefGoogle Scholar
Johnston, B. R. & Halton, D. W. (1981 b). Excystation in vitro of Bucephaloides gracilescens metacercaria (Trematoda: Bucephalidae). Zeitschrift für Parasitenkunde 65, 71–8.CrossRefGoogle Scholar
Lumsden, R. D. (1968). Ultrastructure of the metacercarial cyst of Ascocotyle chandleri Lumsden, 1963 (Trematoda: Heterophyidae). Proceedings of the Helminthological Society of Washington 35, 212–19.Google Scholar
Matthews, R. A. (1974). The life cycle of Bucephaloides gracilescens (Rudolphi, 1819) Hopkins, 1954 (Digenea: Gasterostomata). Parasitology 68, 1–12.CrossRefGoogle ScholarPubMed
Mitchell, C. W. (1974). Ultrastructure of the metacercarial cyst of Posthodiplostomum minimum (MacCullum, 1921). Journal of Parasitology 60, 67–74.CrossRefGoogle Scholar
Pearse, A. G. E. (1968). Histochemistry: Theoretical and Applied, vol. 1. London: Churchill-Livingstone.Google Scholar
Rees, F. G. & Day, M. F. (1976). The origin and development of the epidermis and associated structures in the cercaria of Cryptocotyle lingua (Creplin) (Digenea: Heterophyidae) from Littorina littorea (L.). Proceedings of the Royal Society of London, B 192, 299–321.Google ScholarPubMed
Stein, P. & Lumsden, R. D. (1971). An ultrastructural and cytochemical study of metacercarial cyst development in Ascocotyle pachycystis Schroeder and Leigh, 1965. Journal of Parasitology 57, 1231–46.CrossRefGoogle ScholarPubMed