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The attachment of cercariae of an ectoparasitic digenean, Transversotrema patialensis, to the fish host: behavioural and ultrastructural aspects

Published online by Cambridge University Press:  06 April 2009

P. J. Whitfield ,
R. M. Anderson  and
N. A. Moloney
P. J. Whitfield
Affiliation:
Zoology Department, King's College, Strand, London WC2
R. M. Anderson
Affiliation:
Zoology Department, King's College, Strand, London WC2
N. A. Moloney
Affiliation:
Zoology Department, King's College, Strand, London WC2
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Extract

The behaviour which enables the cercariae of the ectoparasitic digenean, Transversotrema patialensis, to establish themselves on the surface of their fish hosts has been described experimentally using anaesthetized fish. Specialized regions of the cercarial tail, the arm processes, seem to be adapted for both specific recognition of, and rapid attachment to, the outer surface of a fish. Each arm process bears an array of nine ciliary sensory structures, the mammiform receptors, which have been tentatively identified as contact chemoreceptor organs involved in host recognition. Also present on each arm is an adhesive pad that mediates the initial attachment to the host. It is a differentiated region of the distal cytoplasm of the epidermal syncytium which invests the whole arm process. The cytoplasm of the pad region contains membrane-bounded adhesive granules, the contents of which are released during activation of the pad.

Type
Research Article
Information
Parasitology , Volume 70 , Issue 3 , June 1975 , pp. 311 - 330
Copyright
Copyright © Cambridge University Press 1975

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References

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