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The eggs and oncomiracidia of Encotyllabe spp. and the relationship between encotyllabines and other capsalid monogeneans

Published online by Cambridge University Press:  06 April 2009

I. D. Whittington  and
G. C. Kearn
I. D. Whittington
Affiliation:
Department of Parasitology, The University of Queensland, Brisbane, Queensland 4072, Australia
G. C. Kearn
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK
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Summary

The eggs and oncomiracidia of two species of the capsalid genus Encotyllabe are described. These parasites were identified tentatively as E. caballeroi Velasquez, 1977 and E. caranxi Lebedev, 1967. If these identifications are correct, then E. caballeroi is recorded from two new hosts, Gymnocranius audleyi and the nemipterid Scolopsis monogramma, and E. caranxi from a new host, Pseudocaranx dentex, and a new locality, Heron Island, Queensland, Australia. Encotyllabines have not previously been recorded from fishes of the family Nemipteridae. The eggs of the two parasites failed to hatch spontaneously and did not hatch when exposed to a variety of potential hatching stimuli, but the oncomiracidia within survived for many weeks. Oncomiracidia expelled from eggs by cover-slip pressure are unciliated and possess a saucer-shaped haptor like that of other capsalids with three pairs of median sclerites and 14 marginal hooklets. The paths of tendons associated with the accessory sclerites and the presence of haptoral loculi suggest that encotyllabines are related to the trochopodines. Observations on a single juvenile specimen of E. caballeroi show that the accessory sclerites and the tendons are lost early in development and that one pair of hamuli (probably the posterior pair) ceases to grow early in post-oncomiracidial life. The loculi persist a little longer but also disappear before full sexual maturity is reached.

Keywords

monogeneanscapsalidsEncotyllabeeggsoncomiracidiadevelopmentrelationships
Type
Research Article
Information
Parasitology , Volume 104 , Issue 2 , April 1992 , pp. 253 - 261
Copyright
Copyright © Cambridge University Press 1992

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