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Embryological development of the cercarial tegument of Paramphistomum epiclitum in the planorbid snail, Indoplanorbis exustus

Published online by Cambridge University Press:  05 June 2009

T. S. Dunn ,
P. H. Dang ,
R. E. B. Hanna  and
W. A. Nizami
P. H. Dang
Affiliation:
Zoology Department, University of Oklahoma, 730 Van Vleet Oval, Norman, Oklahoma 73012, USA
R. E. B. Hanna
Affiliation:
School of Biological Sciences, The Queen's University of Belfast, Belfast BT7 INN, Northern Ireland, UK
W. A. Nizami
Affiliation:
Zoology Department, Aligarh Muslim University, Aligarh 202 001, India
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Abstract

Cercariae develop from individual germinal cells occurring freely within the posterior body cavity of rediae. Individual germinal cells give rise to a germinal ball which becomes enveloped by increasing numbers of cytoplasmic extensions originating from specialized parenchyma-like cells, termed nursc cells. Up to eight cytoplasmic layers of nurse cells invest larger germinal balls. These layers may provide mechanical support for developing embryos and/or play a role in the provision of nutrients to them. The cercarial tegument develops from superficially located somatic cells in the germinal ball. Cytoplasmic extensions of presumptive tegumental cells fuse laterally to form a syncytial layer beneath the encapsulating nurse cell layers. As the cercarial tegument differentiates further, the cytoplasm of the nurse cell layers becomes vacuolated and ultimately these layers degenerate. The surface tegumental syncytia of intra-redial cercariae and newly released extra-redial cercariae are nucleated. Separate subtegumental perikarya develop with further differentiation of extra-redial cercariae.

Keywords

Paramphistomum epiclitumrediacercariadevelopmenttegumentultrastructureTrematodaDigenea
Type
Research Article
Information
Journal of Helminthology , Volume 66 , Issue 4 , December 1992 , pp. 243 - 254
Copyright
Copyright © Cambridge University Press 1992

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