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Pseudorhabdosynochus hirundineus n. sp. (Monogenea: Diplectanidae) from Variola louti (Perciformes: Serranidae) off New Caledonia

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Abstract

Pseudorhabdosynochus hirundineus n. sp. is described from specimens collected from the gills of Variola louti off Nouméa, New Caledonia, South Pacific. No diplectanid was found on V. albimarginata from the same location. The male sclerotised quadriloculate organ of P. hirundineus is 42 μm in internal length, with a long posterior tube; and the sclerotised vagina, 36 μm in length, is composed of a long tube with anterior open trumpet and two posterior, heavily sclerotised chambers. The two squamodiscs, each with 11–15 rows of rodlets and no central closed row of rodlets, are dissimilar in shape, the ventral being round and the dorsal being oval. By the morphology of its sclerotised vagina, P. hirundineus appears close to P. epinepheli (Yamaguti, 1938) but it is differentiated from it by the shape of its squamodiscs. Pseudorhabdosynochus spp. previously recorded from epinephelines are parasites of species of Epinephelus and Mycteroperca; this is the first species from a species of Variola.

Résumé

Résumé Pseudorhabdosynochus hirundineus n. sp. est décrit de spécimens récoltés sur les branchies de Variola louti au large de Nouméa, Nouvelle Calédonie, Pacifique sud. Aucun Diplectanidae n’a été trouvé chez V. albimarginata de la même origine. L’organe mâle sclérifié tétraloculé de P. hirundineus mesure 42μm de longueur interne et a un long tube postérieur, et le vagin sclérifié, long de 36μm, est composé d’un long tube avec une trompe antérieure et deux chambres postérieures très sclérifiées. Les deux squamodisques, chacun avec 11–15 rangées d’osselets et sans rangée close, sont de formes différentes, le ventral rond et le dorsal ovale. Par la morphologie de son vagin sclérifié, P. hirundineus semble proche de P. epinepheli (Yamaguti, 1938), mais s’en distingue par la forme de ses squamodisques. Les espèces de Pseudorhabdosynochus mentionnées auparavant chez les Epinephelinae étaient parasites d’espèces des genres Epinephelus et Mycteroperca; ceci est la première espèce chez Variola.

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

    Jean-Lou Justine

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Justine, JL. Pseudorhabdosynochus hirundineus n. sp. (Monogenea: Diplectanidae) from Variola louti (Perciformes: Serranidae) off New Caledonia. Syst Parasitol 62, 39–45 (2005). https://doi.org/10.1007/s11230-005-5481-z

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