Hostname: page-component-78c5997874-4rdpn Total loading time: 0 Render date: 2024-11-07T22:20:58.176Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Grant, E. (1987). Fishes of Australia. Scarborough, Australia: E.M. Grant Pty Ltd, Publishers.Google Scholar
Hargis, W. J. Jr & Dillon, W. A. (1968). Helminth parasites of Antarctic vertebrates. Part IV. Monogenetic trematodes from Antarctic fishes: the superfamily Capsaloidea Price, 1936. Proceedings of the Biological Society of Washington 81, 403–12.Google Scholar
Jahn, T. L. & Kuhn, L. R. (1932). The life-history of Epibdella melleni MacCallum, 1927, a monogenetic trematode parasitic on marine fishes. Biological Bulletin 62, 89–111.CrossRefGoogle Scholar
Kearn, G. C. (1963). The egg, oncomiracidium and larval development of Entobdella soleae, a monogenean skin parasite of the common sole. Parasitology 53, 435–47.CrossRefGoogle Scholar
Kearn, G. C. (1964). The attachment of the monogenean Entobdella soleae to the skin of the common sole. Parasitology 54, 327–35.CrossRefGoogle Scholar
Kearn, G. C. (1971). The attachment site, invasion route and larval development of Trochopus pini, a monogenean from the gills of Trigla hirundo. Parasitology 63, 513–25.CrossRefGoogle Scholar
Kearn, G. C. (1975). The mode of hatching of the monogenean Entobdella soleae, a skin parasite of the common sole (Solea solea). Parasitology 71, 419–31.CrossRefGoogle ScholarPubMed
Kearn, G. C. (1980). Light and gravity responses of the oncomiracidium of Entobdella soleae and their role in host location. Parasitology 81, 71–89.CrossRefGoogle Scholar
Kearn, G. C. (1986 a). Role of chemical substances from fish hosts in hatching and host-finding in monogeneans. Journal of Chemical Ecology 12, 1651–8.CrossRefGoogle ScholarPubMed
Kearn, G. C. (1986 b). The eggs of monogeneans. Advances in Parasitology 25, 175–273.CrossRefGoogle ScholarPubMed
Kearn, G. C. (1988). Orientation and locomotion in the monogenean parasite Entobdella soleae on the skin of its host (Solea solea). International Journal for Parasitology 18, 753–9.CrossRefGoogle ScholarPubMed
Kearn, G. C. (1990). The rate of development and longevity of the monogenean skin parasite Entobdella soleae. Journal of Helminthology 64, 340–2.CrossRefGoogle ScholarPubMed
Khalil, L. F. & Abdul-Salam, J. B. (1988). The subfamily Encotyllabinae (Monogenea: Capsalidae) with the description of Alloencotyllabe caranxi n. g., n. sp. and Encotyllabe kuwaitensis n. sp. Systematic Parasitology 11, 139–50.CrossRefGoogle Scholar
Lebedev, B. I. (1967). Two new species of monogeneans of the genus Encotyllabe Diesing, 1850 from Percomorphi of the New Zealand–Australian shelf [in Russian]. Parazitologiya 1, 529–34.Google Scholar
Macdonald, S. (1974). Host skin mucus as a hatching stimulant in Acanthocotyle lobianchi, a monogenean from the skin of Raja spp. Parasitology 68, 331–8.CrossRefGoogle ScholarPubMed
Noble, E. R. (1966). The genus Encotyllabe (Class Trematoda) with a description of a new species. Transactions of the American Microscopical Society 85, 144–51.CrossRefGoogle Scholar
Ogawa, K. (1984). Development of Benedenia hoshinae (Monogenea) with some notes on its occurrence on the host. Bulletin of the Japanese Society of Scientific Fisheries 50, 2005–11.CrossRefGoogle Scholar
Randall, J. E., Allen, G. R. & Steene, R. C. (1990). The Complete Diver's and Fisherman's Guide to Fishes of the Great Barrier Reef and Coral Sea. Bathurst, Australia: Crawford House Press.Google Scholar
Rohde, K. (1991). Size differences in hamuli of Kuhnia scombri (Monogenea: Polyopisthocotylea) from different geographical areas not due to differences in host size. International Journal for Parasitology 21, 113–14.CrossRefGoogle Scholar
Velasquez, C. C. (1977). A new monogenetic trematode, Encotyllabe caballeroi sp. nov. (Capsalidae) in a marine fish from the Philippines. Excerta Parasitológica en Memoria del Doctor Eduardo Caballero y Caballero. Instituto de Biología, Universidad Nacional Autónoma de México, Publicaciones Especiales 4, 117–20.Google Scholar
Whittington, I. D. & Kearn, G. C. (1988). Rapid hatching of mechanically-disturbed eggs of the monogenean gill parasite Diclidophora luscae, with observations on sedimentation of egg bundles. International Journal for Parasitology 18, 847–52.CrossRefGoogle Scholar
Whittington, I. D. & Kearn, G. C. (1989). Rapid hatching induced by light intensity reduction in the polyopisthocotylean monogenean Plectanocotyle gurnardi from the gills of gurnards (Triglidae), with observations on the anatomy and behaviour of the oncomiracidium. Journal of the Marine Biological Association of the United Kingdom 69, 609–24.CrossRefGoogle Scholar
Williams, A. & Beverley-Burton, M. (1989). Redescription of three species of the genus Encotyllabe (Capsalidae: Monogenea) from fishes of the east coast of Australia. Australian Journal of Zoology 37, 45–53.CrossRefGoogle Scholar
Yamaguti, S. (1963). Systema Helminthum. Volume IV. Monogenea and Aspidocotylea. New York, London: Interscience Publishers.Google Scholar