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Mechanism of adhesion and detachment at the anterior end of Merizocotyle icopae (Monogenea: Monocotylidae) including ultrastructure of the anterior adhesive matrix

Published online by Cambridge University Press:  06 August 2004

B. W. CRIBB ,
W. D. ARMSTRONG  and
I. D. WHITTINGTON
B. W. CRIBB
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland 4072, Australia Department of Zoology and Entomology, School of Life Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
W. D. ARMSTRONG
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland 4072, Australia
I. D. WHITTINGTON
Affiliation:
Monogenean Research Laboratory, Parasitology Section, The South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia Marine Parasitology, Environmental Biology, School of Earth and Environmental Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
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Abstract

The anterior adhesive mechanism was studied for Merizocotyle icopae (Monogenea: Monocotylidae). Adult anterior apertures can open and close. In addition, duct endings terminating within the apertures are everted or retracted depending on the stage of attachment. Adhesive in adults is synthesized from all 3 secretory types (rod-shaped, small and large spheroidal bodies) found within anterior apertures. All exit together and undergo mixing to produce the adhesive matrix, a process that depletes duct contents. A greater number of ducts carrying rod-shaped bodies is depleted than ducts containing spheroidal bodies which changes the ratio of secretory types present on detachment. Detachment involves elongation of duct endings and secretion of additional matrix as the worm pulls away from the substrate. The change in secretory type ratio putatively modifies the properties of the secreted matrix enabling detachment. Only after detachment do ducts refill. During attachment, individual secretory bodies undergo morphological changes. The larval and adult adhesive matrix differs. Anterior adhesive in oncomiracidia does not show fibres with banding whereas banded fibres comprise a large part of adult adhesive. The data suggest that this is the result of adult spheroidal secretions modifying the way in which the adult adhesive matrix forms.

Keywords

tegumentparasiteadhesive gelstissue adhesionelectron microscopyoncomiracidiaadult
Type
Research Article
Information
Parasitology , Volume 129 , Issue 2 , August 2004 , pp. 181 - 190
Copyright
2004 Cambridge University Press

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