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A Study of some of the Factors Affecting Excystation in vitro of the Metacercarial Stages of Holostephanus lühei Szidat, 1936 and Cyathocotyle bushiensis Khan, 1962 (Strigeida: Trematoda)

Published online by Cambridge University Press:  18 November 2009

David A. Erasmus  and
L. J. Bennett
David A. Erasmus
Affiliation:
Department of Zoology, University College, Cardiff
L. J. Bennett
Affiliation:
Department of Zoology, University College, Cardiff
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Extract

In many digenetic trematode life-cycles there occurs a metacercarial stage which is usually the ultimate infective stage for the final host. The metacercarial stage may be free and active as in Diplostomatidae (Strigeida) but in most cases the metacercaria is enclosed within a cyst wall of varying thickness and complexity (Erasmus, 1965). The release of the metacercaria follows the ingestion of the cyst and the digestion of the cyst wall by the appropriate final host. It is apparent that the culmination of the life-cycle in the development of a sexually mature adult will occur only if the release of the metacercaria takes place in the appropriate host. It seems very likely therefore that the factors affecting the excystation of metacercariae play an important role in defining the host specificity of a particular trematode.

Type
Research Article
Information
Journal of Helminthology , Volume 39 , Issue 2-3 , June 1965 , pp. 185 - 196
Copyright
Copyright © Cambridge University Press 1965

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