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Cryptocotyle lingua (Creplin) (Digenea: Heterophyidae): observations on the morphology of the redia, with special reference to the birth papilla and release of cercariae

Published online by Cambridge University Press:  06 April 2009

S. W. B. Irwin ,
L. T. Threadgold  and
Nicola M. Howard
S. W. B. Irwin
Affiliation:
School of Life Sciences, Ulster College, The Northern Ireland Polytechnic, Jordanstown, Co. Antrim, Northern Ireland
L. T. Threadgold
Affiliation:
Department of Zoology, The Queen's University, Belfast 9, Northern Ireland
Nicola M. Howard
Affiliation:
School of Life Sciences, Ulster College, The Northern Ireland Polytechnic, Jordanstown, Co. Antrim, Northern Ireland
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Summary

Rediae of Cryptocotyle lingua were studied using transmission and stereoscan electron microscopy. The mouth is surrounded by numerous ciliated sensory structures. Posteriorally, the body wall is concentrically folded and its surface area is greatly increased by the closely ridged configuration of the outer membrane of the tegument. Attached to the surface, especially at the anterior end, are numerous, small spherical vesicles. At the posterior end there is a retractable papilliform process. The appearance of the surface of the birth papilla is variable. The birth pore is lined by an epithelium which is specialized to withstand extreme distortion. A single cilium is frequently visible in the birth pore lumen. The release of each cercaria is preceded by the emission of a tiny drop of fluid from the birth pore. It is suggested that this fluid acts as a lubricant to the passage of the cercaria through the pore.

Type
Research Article
Information
Parasitology , Volume 76 , Issue 2 , April 1978 , pp. 193 - 199
Copyright
Copyright © Cambridge University Press 1978

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