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An ultrastructural study of excretory system development in the cercariae of Prosorhynchoides gracilescens (Rudolphi, 1819) and Prosorhynchus squamatus Odhner, 1905 (Digenea, Bucephalidae)

Published online by Cambridge University Press:  06 August 2004

I. M. PODVYAZNAYA ,
K. V. GALAKTIONOV  and
S. W. B. IRWIN
I. M. PODVYAZNAYA
Affiliation:
The Laboratory of Parasitic Worms, Zoological Institute of the Russian Academy of Sciences, Universitetskaya nab., 1, St Petersburg 199034, Russia
K. V. GALAKTIONOV
Affiliation:
The White Sea Biological Station, Zoological Institute of the Russian Academy of Sciences, Universitetskaya nab., 1, St Petersburg 199034, Russia
S. W. B. IRWIN
Affiliation:
School of Biological and Environmental Sciences, University of Ulster, Shore Road, Newtownabbey, Co. Antrim BT37 0QB, Northern Ireland
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Abstract

The ultrastructure of the developing excretory system of Prosorhynchoides gracilescens and Prosorhynchus squamatus cercariae is described. The development pattern was similar in both species. In early embryos the two main collecting tubes were composed of a layer of cells which were wrapped around the lumen. Later, the tubes fused and the excretory epithelium of the fusion zone and that of the lateral caudal ducts became a syncytium. The collecting tubes in the cercarial body retained their cellular organization. As the tails grew, additional excretory pores were formed in the tail stem where thickened portions of the caudal duct epithelium contacted the surface tegument. Following this, the distal portions of the lateral caudal ducts lost contact with the primary excretory pores and progressively degenerated. Excretory atrium development started with differentiation of secretory active cytons peripheral to the fusion zone. These cells gave rise to cytoplasmic extensions that penetrated the fusion zone wall to eventually form a continuous cytoplasmic layer. This layer eventually replaced some of the fusion zone excretory epithelium and became the lining of the excretory atrium. The anterior end of the fusion zone differentiated into an excretory bladder and a short posterior portion gave rise to the caudal vesicle.

Keywords

ultrastructureexcretory systemdevelopmentcercariaBucephalidaeDigenea
Type
Research Article
Information
Parasitology , Volume 129 , Issue 2 , August 2004 , pp. 165 - 179
Copyright
2004 Cambridge University Press

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