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Speciation of echinostomes: evidence for the existence of two sympatric sibling species in the complex Echinoparyphium recurvatum (von Linstow 1873) (Digenea: Echinostomatidae)

Published online by Cambridge University Press:  06 April 2009

A. M. McCarthy
A. M. McCarthy
Affiliation:
Division of Biosphere Sciences, King's College London, University of London, Kensington, London W8 7AH
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Summary

Evidence for the existence of 2 first intermediate host-specific sibling species of the 45 collar-spined echinostome Echinoparyphium recurvatum is presented. Experimental studies on their life-cycles were carried out under controlled laboratory conditions. The two entities were found to be morphologically indistinguishable in all major respects, yet they exhibited distinct biological characteristics. One of the sibling species utilizes the freshwater lymnaeid pulmonate snail Lymnaea peregra as first intermediate host, and the adults occur in the anterior small intestine of the wildfowl experimental definitive host Anas platyrhynchos. The other utilizes the freshwater mesogastropod prosobranch snail Valvata piscinalis as first intermediate host, and the adults occur in the posterior small intestine and rectum of A. platyrhynchos. The existence of the two sibling species in sympatry may be explained by the fact that the life-cycles of the two forms represent two distinct cycles of transmission serving to reduce excessive competition between them.

Keywords

Echinoparyphium recurvatumechinostomesympatric sibling speciesco-existencehost specificitylife-cycles
Type
Research Article
Information
Parasitology , Volume 101 , Issue 1 , August 1990 , pp. 35 - 42
Copyright
Copyright © Cambridge University Press 1990

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