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Ultrastructure of the embryonic syncytial epithelium in a cestode Hymenolepis diminuta

Published online by Cambridge University Press:  06 April 2009

Krystyna Rybicka
Krystyna Rybicka
Affiliation:
Department of Biology, Rice University, Houston, Texas*
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Extract

The embryonic epithelium in Hymenolepis diminuta appears in the early preoncosphere stage. Inside the embryo there is a binucleate cell connected by a cytoplasmic strand with an epithelial layer spreading over the embryonic surface. After the embryo has become covered by tine epithelium the latter delammates into three layers. A basal layer resting on the basal lamina accumulates dense bodies. These bodies are spheroid and membrane-bound in the early embryo. In the late preoncosphere stage rodlike bodies remain in the basal epithelial layer. The basal membrane forms long invaginations into the basal layer. The intermediate epithelial layer is rich in polysomes and it is postulated that secretes extracellular material which cements the intermediate and peripheral layers and the ‘oncospheral membrane’. The continuity in embryonic, larval and adult cestode epithelium is discussed.

Type
Research Article
Information
Parasitology , Volume 66 , Issue 1 , February 1973 , pp. 9 - 18
Copyright
Copyright © Cambridge University Press 1973

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