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The ultrastructure of the tegument of the daughter sporocyst of Microphallus similis (Jäg., 1900) (Digenea: Microphallidae)

Published online by Cambridge University Press:  06 April 2009

Irene Popiel  and
B. L. James
Irene Popiel
Affiliation:
Department of Zoology, University College, Swansea
B. L. James
Affiliation:
Department of Zoology, University College, Swansea
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Summary

In the fully formed daughter sporocyst of Microphallus similis (Jäg.) the tegument is divided into a wide, outer cellular epithelium and a narrow, inner electron-dense anucleated microvillous syncytium. The narrow subtegument consists of circular and longitudinal muscle, nervous, synthesizing and germinal cells. It is suggested that during development of the tegument, an undifferentiated nucleated syncytium becomes divided by the formation of membranes between the nuclei and between the narrow, inner electron-dense microvillous and the outer cellular regions. The outer nucleated region of the tegument is homologous to the nucleated investing syncytium which surrounds redial and cercarial embryos and which is shed later in development. The retention of the nucleated region in some daughter sporocysts is, therefore, an example of paedogenesis.

Type
Research Article
Information
Parasitology , Volume 76 , Issue 3 , June 1978 , pp. 359 - 367
Copyright
Copyright © Cambridge University Press 1978

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References

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