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Species of Calydiscoides Young, 1969 (Monogenea: Diplectanidae) from lethrinid fishes, with the redescription of all of the type-specimens and the description of C. euzeti n. sp. from Lethrinus rubrioperculatus and L. xanthochilus off New Caledonia

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Abstract

Type-specimens of all known species of Calydiscoides Young, 1969 from lethrinids, namely C. australis Young, 1969 (type-species), C. difficilis (Yamaguti, 1953) Young, 1969, C. duplicostatus (Yamaguti, 1953) Young, 1969, C. rohdei Oliver, 1984 and C. gussevi Oliver, 1984, were re-examined; the male copulatory organs (MCO) of the type-specimens are figured for comparison. Two groups are distinguished within Calydiscoides: the ‘difficilis’ group, with a massive MCO (C. difficilis and C. rohdei), and the ‘australis’ group, with a branched MCO (C. australis, C. duplicostatus and C. gussevi). Species of Calydiscoides were found in seven species of Lethrinus (Lethrinidae) off New Caledonia, South Pacific. C. australis and C. gussevi from L. miniatus, their type-host, and C. rohdei from L. atkinsoni, its type-host, are re-described from New Caledonian specimens; all were previously known only from off eastern Australia and are new geographical records for New Caledonia. C. euzeti n. sp. is described from specimens collected from L. rubrioperculatus (type-host) and L. xanthochilus off New Caledonia. Specimens from the two hosts have slightly different measurements of the haptoral hard-parts but a similar morphology of the MCO. The new species belongs to the ‘australis’ group and is characterised by its MCO, which is 70–83 μm in length, elongate in shape with a characteristic anterior curved whip.

Résumé

Les spécimens-types de toutes les espèces connues de Calydiscoides Young, 1969 parasites de Lethrinidae, soit C. australis Young, 1969 (espèce-type), C. difficilis (Yamaguti, 1953) Young, 1969, C. duplicostatus (Yamaguti, 1953) Young, 1969, C. rohdei Oliver, 1984, et C. gussevi Oliver, 1984, ont été examinés, et les organes copulateurs mâles (OCM) des spécimens-types sont figurés pour comparaison. Deux groupes sont distingués dans Calydiscoides, le groupe ‘difficilis’, à OCM massif (C. difficilis et C. rohdei), et le groupe ‘australis’, à OCM formé de branches (C. australis, C. duplicostatus et C. gussevi). Des spécimens de Calydiscoides ont été trouvés chez sept espèces de Lethrinus (Lethrinidae) en Nouvelle-Calédonie, Pacifique Sud. C. australis et C. gussevi chez L. miniatus, leur hôte-type, et C. rohdei chez L. atkinsoni, son hôte-type, sont redécrits à partir de spécimens néo-calédoniens. Ces espèces n’étaient connus que d’Australie Orientale et constituent des nouvelles mentions géographiques pour la Nouvelle-Calédonie. C. euzeti n. sp. est décrit à partir de spécimens récoltés chez L. rubrioperculatus (hôte-type) et L. xanthochilus en Nouvelle-Calédonie. Les spécimens des deux hôtes ont des dimensions des parties sclérifiées du hapteur légèrement différentes, mais une morphologie semblable de l’OCM. La nouvelle espèce appartient au groupe ‘australis’ et est caractérisée par son OCM, long de 70–83 μm, allongé, et portant un fouet antérieur courbé caractéristique.

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Acknowledgements

Louis Euzet (Sète, France) helped with an early study of the new species. Julie Mounier, volunteer technician, and Charles Beaufrère, Audrey Guérin, Anaïs Guillou, Amandine Marie, Chloé Journo, Violette Justine, Eric Bureau, Maya Robert, Damien Hinsinger, Aude Sigura, Guilhem Rascalou and Géraldine Colli, all students, and Frank Moravec and Susan Lim, visitor scientists, participated in the fishing operations and parasitological survey. Alexia Cron and Kostia Arnone, students, participated in an unfinished study in 2003. Sam Tereua, Miguel Clarque and Napoléon Colombani, captains of the R/V ‘Coris’ provided safe navigation. Gérard Mou Tham (IRD) spear-fished certain specimens. Angelo di Matteo (IRD) provided technical help. Ian Beveridge (Melbourne, Australia), and Geoffrey Boxshall and Rod Bray (NHM, London, England) agreed to study, respectively, cestodes, copepods and digeneans. Kent Carpenter (Old Dominion University, Virginia) kindly identified some of the fish from photographs. Jimmy Cassone (MNHN, Paris), Eric P. Hoberg and Pat Pilitt (USNPC, Beltsville) and Takashi Iwaki (MPM, Tokyo) kindly arranged the loan of type-specimens.

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

    Jean-Lou Justine

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Justine, JL. Species of Calydiscoides Young, 1969 (Monogenea: Diplectanidae) from lethrinid fishes, with the redescription of all of the type-specimens and the description of C. euzeti n. sp. from Lethrinus rubrioperculatus and L. xanthochilus off New Caledonia. Syst Parasitol 67, 187–209 (2007). https://doi.org/10.1007/s11230-006-9087-x

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