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Ovarian tissue in juvenile palaeacanthocephalans: Corynosoma semerme, C. strumosum and Echinorhynchus gadi

Published online by Cambridge University Press:  06 April 2009

Raija Peura ,
E. Tellervo Valtonen  and
D. W. T. Crompton
Raija Peura
Affiliation:
Institute of Electron Optics, University of Oulu, Linnanmaa, SF-90570, Oulu 57, FI
E. Tellervo Valtonen
Affiliation:
Department of Biology, University of Jyväskylä, Seminaarinkatu 15, SF-40100, Jyväskylä, FI
D. W. T. Crompton
Affiliation:
Department of Zoology, University of Glasgow, Glasgow G12 8QQ, Scotland
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Summary

The structure of the ovarian tissue in juvenile Corynosoma semerme and C. strumosum from a fish paratenic host and in the cystacanth stage of Echinorhynchus gadi from an amphipod intermediate host was investigated by means of transmission electron microscopy. The species were obtained from hosts living in the Baltic Sea. The observations indicate that ovarian development was more advanced in cystacanths of E. gadi than in juveniles of C. semerme and C. strumosum. Free ovaries were present in E. gadi with an obvious supporting syncytium and surface microvilli. The biological significance of the different stages of ovarian development in these species is discussed briefly in relation to either reproductive strategies and host specificity in definitive hosts or to the attainment of infectivity by cystacanths in intermediate hosts.

Type
Research Article
Information
Parasitology , Volume 93 , Issue 3 , December 1986 , pp. 471 - 480
Copyright
Copyright © Cambridge University Press 1986

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References

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