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Hiding in the swamp: new capillariid nematode parasitizing New Zealand brown mudfish

Published online by Cambridge University Press:  22 June 2017

F. Jorge ,
R.S.A. White  and
R.A. Paterson
F. Jorge*
Affiliation:
Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand
R.S.A. White
Affiliation:
School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
R.A. Paterson
Affiliation:
Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand School of Biosciences, University of Cardiff, Cardiff, CF10 3AX, United Kingdom
*
*E-mail: [email protected]
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Abstract

The extent of New Zealand's freshwater fish-parasite diversity has yet to be fully revealed, with host–parasite relationships still to be described from nearly half the known fish community. While advances in the number of fish species examined and parasite taxa described are being made, some parasite groups, such as nematodes, remain poorly understood. In the present study we combined morphological and molecular analyses to characterize a capillariid nematode found infecting the swim bladder of the brown mudfish Neochanna apoda, an endemic New Zealand fish from peat-swamp-forests. Morphologically, the studied nematodes are distinct from other Capillariinae taxa by the features of the male posterior end, namely the shape of the bursa lobes, and shape of spicule distal end. Male specimens were classified into three different types according to differences in the shape of the bursa lobes at the posterior end, but only one was successfully characterized molecularly. Molecular analysis indicated that the studied capillariid is distinct from other genera. However, inferences about the phylogenetic position of the capillariid reported here will remain uncertain, due to the limited number of Capillariinae taxa characterized molecularly. The discovery of this new capillariid, which atypically infects the swim bladder of its host, which itself inhabits a very unique ecosystem, underlines the very interesting evolutionary history of this parasite, which for now will remain unresolved.

Type
Research Paper
Information
Journal of Helminthology , Volume 92 , Issue 3 , May 2018 , pp. 379 - 386
Copyright
Copyright © Cambridge University Press 2017 

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