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Epidermal fine structure and development in the oncomiracidium larva of Entobdella soleae (Monogenea)

Published online by Cambridge University Press:  06 April 2009

Kathleen M. Lyons
Kathleen M. Lyons
Affiliation:
Department of Zoology, University of London King's College, Strand, London WC2R 2LS
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Extract

The development of the epidermis of the oncomiracidium larva of Entobdella soleae was studied in embryos dissected from the egg and processed for electron microscopy. At first (7- to 8-day embryos at 15 °C) the embryo is covered with a nucleated primary epidermis of flattened cells which are closely associated with the viteUine cells and may take up nutrients from them. This layer is either replaced by or develops into the secondary epidermis which consists of ciliated cellular regions joined by an apparently syncytial interciliary cytoplasmic layer. Both ciliated cells and interciliary cytoplasm are at first nucleated but later both lose their nuclei. There may be a turnover of ciliated epidermal cells at the surface of young embryos. Between days 16–20 a discontinuous presumptive adult epidermis appears beneath the ciliated cells which has connexions to cell bodies lying in the parenchyma. This layer, apparently fuses with the syncytial (?) interciliary regions which have by this time lost their nuclei. After shedding of the ciliated cells, the presumptive adult epidermis spreads out to form a continuous syncytial covering to the post-larva. The ciliated epidermal cells apparently lose their nuclei between days 20 and hatching. This may be associated with the ‘programmed life’ of the ciliated cells. Details of the food reserves and morphology of the ciliated cells are discussed in connexion with the energetics of these cells.

Type
Research Article
Information
Parasitology , Volume 66 , Issue 2 , April 1973 , pp. 321 - 333
Copyright
Copyright © Cambridge University Press 1973

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References

Chapman, D. M., (1968). A new type of muscle cell from the subumbrella of Obelia. Journal of the Marine Biological Association of the United Kingdom 48, 667–88.CrossRefGoogle Scholar
Dorey, A. E., (1965). The organization and replacement of the epidermis in acoelous turbellarians. Quarterly Journal of Microscopical Science 106, 147–72.Google ScholarPubMed
Gilula, N. B., & Satir, P., (1971). Septate and gap junctions in molluscan gill epithelium. The Journal of Cell Biology 51, 869–72.CrossRefGoogle ScholarPubMed
Hockley, D. J., (1972). Schistosoma mansoni: the development of the cercarial tegument. Parasitology 64, 245–52.CrossRefGoogle ScholarPubMed
Kearn, G. C., (1963a). 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., (1963b). The life cycle of the monogenean Entobdella soleae, a skin parasite of the common sole. Parasitology 53, 253–63.CrossRefGoogle Scholar
Kearn, G. C., (1971). The physiology and behaviour of the monogenean skin parasite Entobdella soleae in relation to its host Solea solea. In Ecology and Physiology of Parasites: a Symposium,. (ed. Fallis, A. M.). University of Toronto Press.Google Scholar
Lumsden, R. D., (1966). Cytological studies on the absorptive surfaces of cestodes I. The fine structure of the strobilar integument. Zeitschrift für Parasitenkunde 27, 355–82.CrossRefGoogle ScholarPubMed
Lyons, K. M., (1968). A comparison of the adult epidermis of some monogeneans: the development of the outer layer in Entobdella soleae. Parasitology 58, 14P.Google Scholar
Lyons, K. M., (1970a). The fine structure and function of the adult epidermis of two skin parasitic monogeneans, Entobdella soleae and Acanthocotyle elegans. Parasitology 60, 39–52.CrossRefGoogle ScholarPubMed
Lyons, K. M., (1970b). Fine structure of the outer epidermis of the viviparous monogenean Gyrodactylus sp. from the skin of Gasterosteus aculeatus. Journal of Parasitology 56, 1110–17.CrossRefGoogle Scholar
Lyons, K. M., (1972). Sense organs of monogeneans. In Behavioural Aspects of Parasite Transmission. Zoological Journal of the Linnean Society 51, 181–99.Google Scholar
Pantin, C. F. A., (1960). In Notes on Microscopical Technique for Zoologists. Cambridge University Press.Google Scholar
Pearse, A. G. E., (1961). In Histochemistry, Theoretical and Applied, 2nd ed., London: J. and A. Churchill Ltd.Google Scholar
Skaer, R. J., (1965). The origin and continuous replacement of epidermal cells in the planarian Polycelis tenuis (Ijima). Journal of Embryology and Experimental Morphology 13, 129–39.Google Scholar
Southgate, V. R., (1970). Observations on the epidermis of the miracidium and on the formation of the tegument of the sporocyst of Fasciola hepatica. Parasitology 61, 177–90.CrossRefGoogle ScholarPubMed
Wilson, R. A., (1969). Fine structure of the tegument of the miracidium of Fasciola hepatica L. Journal of Parasitology 55, 124–33.CrossRefGoogle ScholarPubMed
Wilson, R. A., Pullin, R., & Dentson, J., (1971). An investigation of the mechanism of infection by digenetic trematodes: the penetration of the miracidium of Fasciola hepatica into its snail host Lymnaea truncatula. Parasitology 63, 491–506.CrossRefGoogle ScholarPubMed
Wright, C. A., (1971). In Flukes and Snails, London: George Allen and Unwin Ltd. 168 pp.Google Scholar