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Prosorhynchoides borealis Bartoli, Gibson & Bray, 2006 (Digenea: Bucephalidae) cercariae from Abra prismatica (Mollusca: Bivalvia) in Icelandic waters

Published online by Cambridge University Press:  05 January 2012

M. Eydal ,
M.A. Freeman ,
Á. Kristmundsson ,
S.H. Bambir ,
P.M. Jónsson  and
S. Helgason
M. Eydal*
Affiliation:
Institute for Experimental Pathology, University of Iceland, Keldur v/Vesturlandsveg, IS-112Reykjavík, Iceland
M.A. Freeman
Affiliation:
Institute of Biological Sciences & Institute of Ocean and Earth Sciences, University of Malaya, Kuala Lumpur50603, Malaysia
Á. Kristmundsson
Affiliation:
Institute for Experimental Pathology, University of Iceland, Keldur v/Vesturlandsveg, IS-112Reykjavík, Iceland
S.H. Bambir
Affiliation:
Institute for Experimental Pathology, University of Iceland, Keldur v/Vesturlandsveg, IS-112Reykjavík, Iceland
P.M. Jónsson
Affiliation:
Vestmannaeyjar Research Centre, Strandvegur 50, IS-900Vestmannaeyjar, Iceland
S. Helgason
Affiliation:
Institute for Experimental Pathology, University of Iceland, Keldur v/Vesturlandsveg, IS-112Reykjavík, Iceland
*
* Fax: +354 5673979, E-mail: meydal@hi.is
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Abstract

This paper reports the adult stage of Prosorhynchoides borealis (Digenea) from Lophius piscatorius in Icelandic waters and infections with the larval stages (sporocysts and cercariae) found for the first time in the bivalve Abra prismatica (Semelidae). The previously known first intermediate host was Abraalba (Semelidae). Ribosomal DNA sequencing studies on all three life stages of the parasite (cercariae, metacercariae, adults) were performed to confirm their identites. Morphometric measurements confirmed that the adult worms belong to the newly described species P. borealis. Prosorhynchoides borealis sporocysts filled with cercariae were found in 16% of A. prismatica bivalves sampled at depths between 34 and 93 m off South Iceland. Prevalence ranged from 0 to 44% between different localities. The parasite was found only in the larger bivalves. Extensive sporocyst infection in the haemocoel of the foot caused mechanical muscle damage with subsequent degeneration and necrosis. Other tissues, including the digestive gland, nephridia, gills and intestine, were less heavily infected. Only focal necrosis was observed in the digestive gland, nephridia and gills, and local atrophy in the intestine. Cercariae were also observed in the lumen of both the stomach and intestine. This is the first report of A. prismatica as an alternative first intermediate host for P. borealis. Ribosomal DNA sequence data reveals 100% homology in the data between cercariae, metacercariae and adult digeneans, supporting the morphological data suggesting that all stages belong to the same species.

Type
Research Papers
Information
Journal of Helminthology , Volume 87 , Issue 1 , March 2013 , pp. 34 - 41
Copyright
Copyright © Cambridge University Press 2012

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