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Resolution of the discrepant host-specificity of Pseudorhabdosynochus species (Monogenea, Diplectanidae) from serranid fishes in the tropical Indo-Pacific

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Acta Parasitologica Aims and scope

Abstract

New material from Epinephelus quoyanus collected from Heron Island, Australia and material collected by Young in the same locality, allegedly from E. merra, and deposited in the Queensland Museum, contained the same three species of diplectanid monogeneans: Pseudorhabdosynochus cupatus (Young, 1969), P. vagampullum (Young, 1969), and P. justinei Zeng et Yang, 2007 (new record for Australia). In contrast, E. merra in New Caledonia harbours only P. melanesiensis (Laird, 1958). It is concluded that the type-host of P. cupatus and P. vagampullum is not E. merra, as indicated in Young (1969), but E. quoyanus, and that P. cupatus sensu Young comprises two species, P. cupatus from E. quoyanus and P. youngi sp. nov. from E. fasciatus. P. youngi sp. nov. is described from E. fasciatus from New Caledonia (type-locality), Heron Island, and French Polynesia, and distinguished from P. cupatus on the basis of the male quadriloculate organ, sclerotised vagina and lamellosquamodiscs. Thus, P. cupatus, P. melanesiensis and P. youngi each have a single host, respectively E. quoyanus, E. merra, and E. fasciatus. Results for E. fasciatus and E. merra in New Caledonia, Wallis and French Polynesia suggest impoverishment of the monogenean fauna in a West-East gradient in the Pacific.

Résumé

Du matériel nouveau extrait de Epinephelus quoyanus récolté à Heron Island, Australie et le matériel collecté par Young dans la même localité, prétendument de E. merra, et déposé au Queensland Museum, contenaient les mêmes trois espèces de Monogènes Diplectanidae, à savoir Pseudorhabdosynochus cupatus (Young, 1969), P. vagampullum (Young, 1969) et P. justinei Zeng et Yang, 2007 (nouvelle mention pour l’Australie). De manière opposée, E. merra en Nouvelle-Calédonie héberge seulement P. melanesiensis (Laird, 1958). Il en est conclu que l’hôte-type de P. cupatus et P. vagampullum n’est pas E. merra, comme indiqué par Young (1969), mais E. quoyanus, et que P. cupatus sensu Young comprend deux espèces, P. cupatus de E. quoyanus et P. youngi sp. nov. de E. fasciatus. P. youngi sp. nov. est décrit de E. fasciatus de Nouvelle-Calédonie (localité-type), de Heron Island (Australie) et de Polynésie Française, et est distingué de l’espèce proche P. cupatus sur la base de l’appareil copulateur male tétraloculé, du vagin sclérifié et des lamellosquamodisques. De ce fait, P. cupatus, P. melanesiensis et P. youngi ont chacun un seul hôte, respectivement E. quoyanus, E. merra et E. fasciatus. Des résultats sur E. fasciatus et E. merra en Nouvelle-Calédonie, Wallis et Polynésie Française suggèrent un appauvrissement de la faune des Monogènes le long d’un gradient Ouest-Est dans le Pacifique.

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Authors and Affiliations

  1. Équipe Biogéographie Marine Tropicale, Unité Systématique, Adaptation, Évolution (CNRS, UPMC, MNHN, IRD), Institut de Recherche pour le Développement, BP A5, 98848, Nouméa Cedex, Nouvelle-Calédonie, France

    Jean-Lou Justine & Cyndie Dupoux

  2. Parasitology Section, School of Molecular and Microbial Sciences and Centre for Marine Studies, The University of Queensland, Brisbane, 4072, Australia

    Thomas H. Cribb

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  1. Jean-Lou Justine
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  2. Cyndie Dupoux
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  3. Thomas H. Cribb
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Correspondence to Jean-Lou Justine.

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Justine, JL., Dupoux, C. & Cribb, T.H. Resolution of the discrepant host-specificity of Pseudorhabdosynochus species (Monogenea, Diplectanidae) from serranid fishes in the tropical Indo-Pacific. Acta Parasit. 54, 119–130 (2009). https://doi.org/10.2478/s11686-009-0027-1

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