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Lecithochirium furcolabiatum (Jones, 1933), Dawes 1947: the miracidium and mother sporocyst

Published online by Cambridge University Press:  05 June 2009

B. F. Matthews  and
R. A. Matthews
B. F. Matthews
Affiliation:
Department of Biological Sciences, Plymouth Polytechnic, Drake Circus, Plymouth, Devon PL4 8AA, UK
R. A. Matthews
Affiliation:
Department of Biological Sciences, Plymouth Polytechnic, Drake Circus, Plymouth, Devon PL4 8AA, UK
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Abstract

Experimental infections of the marine topshell Gibbula umbilicalis with Lecithochirium furcolabiatum (Digenea: Hemiuroidea) have allowed the development of a model system which will enable further studies of the molluscan host response. The long-lived intertidal prosobranch host is easily maintained in the laboratory, and experimental infection rates of 98% were consistently achieved. The miracidium and mother sporocyst have been studied at both light and ultrastructural levels, providing the first account of the morphology of these stages in Hemiuridae. The ingested egg hatches within the host intestine, treatment with L-cysteine and alkaline pH stimulating miracidial emergence in vitro. The general body surface of the miracidium is devoid of spines or cilia, the latter being restricted to four plates near the anterior extremity. The miracidium swims actively prior to penetration of the gut wall, the sporocyst being released from the miracidial epidermal Coat within the haemocoel. Within 5 weeks of infection, the filamentous mother sporocyst Contains 1 to 3 oval germ balls, daughter sporocysts being recorded free within the digestive gland haemocoel 7 weeks later. Twenty three weeks after ingestion of eggs, the daughter sporocyst extends into the host gill filaments, containing cystophorous cercariae ready for emergence.

Keywords

Lecithochirium furcolabiatumTrematodaGibbula umbilicalisprosobranchmiracidiummother sporocystultrastructuremodel system
Type
Research Papers
Information
Journal of Helminthology , Volume 65 , Issue 4 , December 1991 , pp. 259 - 269
Copyright
Copyright © Cambridge University Press 1991

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