Redescription of Rhabdochona papuanensis (Nematoda: Thelazioidea), a parasite of rainbow fishes (Melanotaenia spp.); the first record of the species of Rhabdochona in Australia

František Moravec; Robert Adlard

doi:10.1515/ap-2016-0114

Article

Redescription of Rhabdochona papuanensis (Nematoda: Thelazioidea), a parasite of rainbow fishes (Melanotaenia spp.); the first record of the species of Rhabdochona in Australia

František Moravec and Robert Adlard

Published/Copyright: October 24, 2016

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From the journal Acta Parasitologica Volume 61 Issue 4

Abstract

Numerous specimens of the parasitic nematode Rhabdochona papuanensis Moravec, Riha et Kuchta, 2008 (Spirurida: Rhabdochonidae) were collected from the intestines of the Australian endemic freshwater fish (eastern rainbow fish) Melanotaenia splendida (Peters) (Melanotaeniidae, Atheriniformes) in the Behana Creek, North Queesland during November of 2015. Although many species of Rhabdochona Railliet, 1916 are known to be common parasites of fishes in other continents, the present finding of R. papuanensis represents the first record of the species belonging to this genus from the Australian mainland. Light and scanning electron microscopical examinations of these newly collected specimens made it possible to redescribe in detail this nematode species, originally incompletely described from a congeneric host in Papua New Guinea. Fully developed, filamented eggs of R. papuanensis and the conspecific fourth-stage larva are described for the first time. The present finding of R. papuanensis in M. splendida from Australia represents new host and geographical records.

Keywords: Parasitic nematode; Spirurida; freshwater fish; Melanotaeniidae; Queensland; Australian mainland

Acknowledgements

We would like to express our gratitude to Dr Terrence Miller and Mr Chris Keogh who assisted in field collection and to Associate Professor Jamie Seymore (James Cook University, Cairns) for providing his laboratory to undertake necropsies while in North Queensland. Collection of parasites was funded under the Australian Biological Resources Study (ABRS) Australian National Taxonomy Grant Program grant RF215-05 awarded to R. D. Adlard and T. L. Miller. Authors’ thanks are due to the staff of the Laboratory of Electron Microscopy, Institute of Parasitology, Biology Centre of the AS CR, Ceské Budéjovice for their technical assistance, and to Blanka Skoriková of the same Institute for help with the illustrations. This study was partly supported by the Czech Science Fo-undation (Grant No. P505/12/G112) and by institutional support (RVO:60077344, Institute of Parasitology, BC AS CR).

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Received: 2016-6-4

Revised: 2016-7-25

Accepted: 2016-8-2

Published Online: 2016-10-24

Published in Print: 2016-12-1

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https://doi.org/10.1515/ap-2016-0114

Keywords for this article

Parasitic nematode; Spirurida; freshwater fish; Melanotaeniidae; Queensland; Australian mainland