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The ultrastructure of the parasite—host interface of three tetraphyllidean tapeworms of the elasmobranch Raja naevus

Published online by Cambridge University Press:  06 April 2009

A. H. McVicar
A. H. McVicar
Affiliation:
Zoology Department, University of Aberdeen-p1*
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Extract

Ultrastructural examination of the parasite-host interface of three tetraphyllidean cestodes of Raja naevus (sectioned attached to the intestine) indicates that while the strobilar tegument of each closely follows the typical cestode pattern that of the bothridia has several modifications probably associated with attachment. Microtriches similar to those of the strobilum are absent, although small spines on Echeneibothrium sp. and Phyllobothrium piriei and wart-like structures on Acanthobothrium quadripartitum bothridia are considered to represent the osmiophilic tips of specialized microtriches. The bothridia of the three species have no apparent function in the absorption of food but evidence suggests that the apical pad of the myzorhynchus of Echeneibothrium is specialized for the uptake of nutrients directly from the submucosa of the host intestine to which it is applied. Attachment and sensory roles by the myzorhynchus are also indicated. Echeneibothrium and P. piriei bothridia severely damage the host mucosal surface, while those of A. quadripartitum do little harm. This difference is probably associated with the size, mobility and mode of attachment of the cestodes. There are indications that the bothridia of Echeneibothrium upset the metabolism of mucosal cells in the attachment region. The tips of the strobilar microtriches of A. quadripartitum are shown to function in the attachment of the strobilum to the host mucosa, and in the protection of the microthrix proximal surfaces by a filtering action.

Type
Research Article
Information
Parasitology , Volume 65 , Issue 1 , August 1972 , pp. 77 - 88
Copyright
Copyright © Cambridge University Press 1972

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