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Ultrastructural observations on the redial tegument of Paramphistomum epiclitum from the planorbid snail, Indoplanorbis exustus

Published online by Cambridge University Press:  05 June 2009

T. S. Dunn ,
P. H. Dang ,
G. Mattison ,
R. E. B. Hanna  and
W. A. Nizami
T. S. Dunn*
Affiliation:
Zoology Department, University of Oklahoma, 730 Van Vleet Oval, Norman, Oklahoma 73019, USA
P. H. Dang
Affiliation:
Zoology Department, University of Oklahoma, 730 Van Vleet Oval, Norman, Oklahoma 73019, USA
G. Mattison
Affiliation:
School of Biological Sciences, The Queen's University of Belfast, Belfast, Northern Ireland, UK
R. E. B. Hanna
Affiliation:
School of Biological Sciences, The Queen's University of Belfast, Belfast, Northern Ireland, UK
W. A. Nizami
Affiliation:
Zoology Department, Aligarh Muslim University, Aligarh 202 001, India
*
*T. S. Dunn, Dept. Pathology, BMSB Rm 434, P. O. Box 26901, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73190, USA.
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Abstract

The morphology of the tegument in the redia of Paramphistomum epiclitum (Digenea: Paramphistomidae) resembles that shown by most larval and adult digeneans; an outer surface syncytium is in continuity with the cytoplasm of in-sunken, nucleated cytons. Although tegumental cytons usually contain a single nucleus, some display up to six nuclei. The tegumental syncytium lining the pharynx of P. epiclitum rediae lack underlying cytons. The apical membrane of the tegument is elaborated by folds and microvilli, which presumably facilitate uptake of nutrients and/or exchange of ions involved in osmoregulation. A single type of secretory body, resulting from the fusion of smaller vesicles produced at Golgi complexes in the cytons, occurs throughout the tegument. Uniciliate sensory receptors occur in the surface syncytium particularly around the oral opening.

Keywords

Paramphistomum epiclitumrediategumentultrastructureTrematoda
Type
Research Article
Information
Journal of Helminthology , Volume 66 , Issue 3 , September 1992 , pp. 167 - 176
Copyright
Copyright © Cambridge University Press 1992

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