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The structure and formation of metacercarial cysts in the trematode family Microphallidae Travassos 1920

Published online by Cambridge University Press:  05 June 2009

K.V. Galaktionov ,
I.I. Malkova ,
S.W.B. Irwin ,
D.H. Saville  and
J.G. Maguire
K.V. Galaktionov
Affiliation:
Murmansk Marine Biological Institute, Russian Academy of Sciences Kola Scientific Centre, 17 Vladimirskaya Street, 183101, Murmansk, Russia:
I.I. Malkova
Affiliation:
Murmansk Marine Biological Institute, Russian Academy of Sciences Kola Scientific Centre, 17 Vladimirskaya Street, 183101, Murmansk, Russia:
S.W.B. Irwin*
Affiliation:
School of Applied Biological and Chemical Sciences, University of Ulster at Jordanstown, Shore Road, Newtownabbey, County Antrim, Northern Ireland, BT37 OQB
D.H. Saville
Affiliation:
School of Applied Biological and Chemical Sciences, University of Ulster at Jordanstown, Shore Road, Newtownabbey, County Antrim, Northern Ireland, BT37 OQB
J.G. Maguire
Affiliation:
School of Applied Biological and Chemical Sciences, University of Ulster at Jordanstown, Shore Road, Newtownabbey, County Antrim, Northern Ireland, BT37 OQB
*
*Author for correspondence.
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Abstract

This study deals with the formation of the metacercarial cysts of four microphallid trematodes, Maritrema subdolum, M. arenaria, Levinseniella brachysoma and Microphallus claviformis. The first observable cyst was present around Maritrema arenaria 18 h p.i. (post-infection). The other species had not developed a cyst by day 8 p.i. but their cysts were apparent by day 16 p.i. These were bi-layered and that of M. subdolum was thicker than those of L. brachysoma and Microphallus claviformis of the same age. The structure of older cysts varied substantially between the four species. Microphallus claviformis and Maritrema subdolum cysts were fully formed at 30 days p.i. Like those of M. arenaria they were bi-layered, the outer layer (up to 3 μm thick) being electron-dense and the inner one (up to 7 μm thick) being less electron-dense. The cysts of fully formed L. brachysoma metacercariae were much more complex, composed of four layers, one of which was divisible into three sub-layers. It was concluded that the outer cyst layer was the product of secretory granules which were previously identified in cercarial tegument. The inner, thicker layer was derived from several sources. These included small tegument vesicles produced over the entire surface of the metacercariae, larger fragments of tegument released from the anterio-ventral region and material liberated from the metacercarial excretory bladder. This heterogeneous material accumulated in the cyst lumen for some time before becoming polymerized to form the thick inner layer or layers of the metacercarial cysts.

Type
Research Papers
Information
Journal of Helminthology , Volume 71 , Issue 1 , March 1997 , pp. 13 - 20
Copyright
Copyright © Cambridge University Press 1997

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