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The function of the paraoesophageal glands in an echinostome (digenean) cercaria (? Cercaria spinifera La Valette, 1855)

Published online by Cambridge University Press:  05 June 2009

G. Cleveland  and
G. C. Kearn
G. Cleveland
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
G. C. Kearn
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
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Abstract

An echinostome cercaria (? Cercaria spinifera La Valette, 1855) with 37 collar spines and paraoesophageal glands has been recorded for the first time in Britain from the gastropod Planorbarius corneus. The cercariae penetrate into and encyst in planarians. Observations made on cercariae during penetration indicate that the paraoesophageal glands are used to enter the body of the planarian and that the so-called penetration glands have some other function. Gastropod molluscs may also serve as second intermediate hosts, but there is evidence to indicate that anatomically similar cercariae from different host individuals vary in their second intermediate host preferences.

Keywords

DigeneaechinostomesCercaria spiniferaparaoesophageal glandsplanarianspenetrationPlanorbarius corneus
Type
Research Article
Information
Journal of Helminthology , Volume 63 , Issue 3 , September 1989 , pp. 231 - 238
Copyright
Copyright © Cambridge University Press 1989

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References

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