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Echinococcus granulosus: changes in the surface ultrastructure during protoscolex formation

Published online by Cambridge University Press:  06 April 2009

M. T. Rogan  and
K. Sylvia Richards
M. T. Rogan
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Keele, Staffs. ST5 5BG
K. Sylvia Richards
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Keele, Staffs. ST5 5BG
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Summary

Changes in the tegumentary projections of protoscoleces of Echinococcus granulosus, developing within brood capsules, were examined at the ultrastructural level. The original scant covering of spineless, truncated microtriches was supplemented by a population of microvilli covering the entire surface of protoscoleces in the early stages of formation. As differentiation continued, rostellar hooks were formed by enlargement of single large (T 1) microtriches, and normal spined microtriches were produced on the sucker region. These were formed in two ways: by addition of spine material to the truncated microtriches, and de novo followed by up-lifting from the tegumentary surface. A second type of large microthrix (T2) was present in a band immediately below the developing hooks. These microtriches appeared to be formed from a fusion of existing microtriches, but were subsequently lost prior to scolex invagination. The microvilli were also shed from both the sucker and soma regions, to be replaced by microtriches and small blunt elevations respectively.

Type
Research Article
Information
Parasitology , Volume 94 , Issue 2 , April 1987 , pp. 359 - 367
Copyright
Copyright © Cambridge University Press 1987

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