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Ultrastructure and histochemistry of the tegument of juvenile paramphistomes during migration in Indian ruminants

Published online by Cambridge University Press:  05 June 2009

R.G. Mattison ,
R.E.B. Hanna  and
W.A. Nizami
R.G. Mattison
Affiliation:
School of Biology and Biochemistry, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, UK
R.E.B. Hanna
Affiliation:
School of Biology and Biochemistry, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, UK
W.A. Nizami
Affiliation:
Section of Parasitology, Department of Zoology, Aligarh Muslim University, Aligarh 202002, U.P., India
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Abstract

The tegument of juvenile Paramphistomum epiclitum and Fischoederius elongatus (Paramphistomidae: Digenea) resembles those of other digeneans. Seven types of papillae were observed, mostly on the oral and acetabular surfaces, and increase in number during migration. Also evident are two types of secretory body (T1 and T2) which are synthesized separately in tegumental cytons underlying the syncytium. Exocytosis of T2 bodies occurs at the apical membrane and appears to contribute to a fibrous glycocalyx. The tegumental syncytium lining the pharynx and acetabulum is thinner and has a higher capacity for vacuolation than the general tegument. These may represent important sites for osmoregulation. The absence of mitochondria from the tegument in migrating juveniles suggests limited involvement in energy demanding processes. Pigmentation of the subtegument is first evident in mature cercariae and is progressively eliminated during migration.

Type
Research Papers
Information
Journal of Helminthology , Volume 68 , Issue 3 , September 1994 , pp. 211 - 221
Copyright
Copyright © Cambridge University Press 1994

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