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Ultrastructure of the cercomer of the metacestode Microsomacanthus paraparvula Regel, 1994 (Cestoda: Hymenolepididae)

Published online by Cambridge University Press:  17 October 2012

N.A. Pospekhova  and
K.V. Regel
N.A. Pospekhova*
Affiliation:
Laboratory of Helminth Ecology, Institute of Biological Problems of the North, Far Eastern Branch of Russian Academy of Sciences, Magadan685000, Russia
K.V. Regel
Affiliation:
Laboratory of Helminth Ecology, Institute of Biological Problems of the North, Far Eastern Branch of Russian Academy of Sciences, Magadan685000, Russia
*
*E-mail: [email protected]
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Abstract

Investigations were undertaken using light and transmission electron microscopy to clearly delineate the morphology of the cercomer, i.e. the protective envelopes and tail appendage, in cysticercoids of Microsomacanthus paraparvula, which develop in the haemocoel of the caddisworm Grensia praeterita (Insecta: Trichoptera). Two protective envelopes, the exocyst and endocyst, were identified. The non-cellular exocyst is found to consist of granular material and of thin, dense membrane-like layers, which are located parallel to each other. The exocyst of the mature metacestode tightly adjoins the outer surface of the endocyst, containing prospective parts (the scolex and the neck), except for the areas at its poles. A long tail appendage is located outside the exocyst. Evidence was found to indicate the existence of active synthetic processes occurring in the tail appendage. Non-cellular exocysts are widely distributed within metacestodes of the families Hymenolepididae and Dilepididae, and, presumably, are formed by means of glandular secretions from the oncosphere, given the early appearance of non-cellular exocysts in ontogeny.

Type
Research Papers
Information
Journal of Helminthology , Volume 87 , Issue 4 , December 2013 , pp. 483 - 488
Copyright
Copyright © Cambridge University Press 2012 

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