Systematic Parasitology

, Volume 77, Issue 2, pp 81–105 | Cite as

Monogeneans from Epinephelus chlorostigma (Val.) (Perciformes: Serranidae) off New Caledonia, with the description of three new species of diplectanids

Article

Abstract

Gill monogeneans from the brownspotted grouper Epinephelus chlorostigma (Val.) collected in deep water off the coral barrier reef of New Caledonia, South Pacific, comprise seven species. These include the ancyrocephalid Haliotrema sp., the capsalid Allobenedenia cf. epinepheli Yamaguti, 1968, and five diplectanids, namely Pseudorhabdosynochus epinepheli (Yamaguti, 1938), reported in a previous paper, P. cyanopodus Sigura & Justine, 2008 and P. podocyanus Sigura & Justine, 2008, two species originally described from E. cyanopodus Richardson, P. stigmosus n. sp., P. exoticoides n. sp. and Diplectanum femineum n. sp. P. stigmosus is characterised by a sclerotised vagina with a straight primary canal, large ovoid primary chamber and spherical secondary chamber. P. exoticoides is a highly aberrant species, with a thick-walled male quadriloculate organ and a discoid sclerotised vagina with an exceptional structure. Interestingly, P. exoticoides resembles P. exoticus Sigura & Justine, 2008, a species from E. cyanopodus, and P. stigmosus resembles P. cyanopodus and P. podocyanus, also both from E. cyanopodus, suggesting close relationships between the diplectanid faunae of these two fish species. D. femineum belongs to a group of diplectanids, provisionally classified as ‘Diplectanum’ Diesing, 1858, which all share a small funnel-shaped male copulatory organ. In contrast to other members of this group which have no sclerotised vagina, D. femineum has a sclerotised vagina with the same organisation as those of species of Pseudorhabdosynochus Yamaguti, 1958. This suggests that the species of ‘Diplectanum’ from groupers are closer to Pseudorhabdosynochus than suggested by the structure of the male organs.

Résumé

Les monogènes parasites des branchies d’Epinephelus chlorostigma (Val.), pêché en mer profonde à l’extérieur du récif corallien de Nouvelle-Calédonie, Pacifique Sud, comprennent sept espèces. Celles-ci sont l’Ancyrocephalidae Haliotrema sp., le Capsalidae Allobenedenia cf. epinepheli Yamaguti, 1968 et cinq Diplectanidae, Pseudorhabdosynochus epinepheli (Yamaguti, 1938), signalé dans un article précédent, P. cyanopodus Sigura & Justine, 2008 et P. podocyanus Sigura & Justine, 2008, deux espèces originellement décrites de E. cyanopodus Richardson, P. stigmosus n. sp., P. exoticoides n. sp. et Diplectanum femineum n. sp. P. stigmosus est caractérisé par un vagin sclérifié avec canal primaire droit, chambre primaire grande et ovoïde et chambre secondaire sphérique. P. exoticoides est une espèce aberrante, avec un organe mâle tétraloculé à paroi épaisse et un vagin sclérifié discoïde à structure exceptionnelle. De manière intéressante, P. exoticoides ressemble à P. exoticus Sigura & Justine, 2008, une espèce de E. cyanopodus, et P. stigmosus ressemble à P. cyanopodus et P. podocyanus, aussi deux espèces de E. cyanopodus, ce qui suggère des relations entre les faunes de Diplectanidae de ces deux poissons. D. femineum appartient à un groupe de Diplectanidae, classés provisoirement dans ‘Diplectanum’ Diesing, 1858, qui ont tous un petit organe copulateur mâle en forme d’entonnoir. À l’opposé des autres membres de ce groupe qui n’ont pas de vagin sclérifié, D. femineum a un vagin sclérifié de même structure que celui des Pseudorhabdosynochus Yamaguti, 1958. Cela suggère que les ‘Diplectanum’ des mérous sont plus proches des Pseudorhabdosynochus que ne pouvait le faire croire la structure des organes mâles.

Notes

Acknowledgements

Sophie Olivier and Charlotte Schoelinck, students, participated in the fishing operations and parasitological survey and skilfully helped in the preparation of slides. The identification of the hosts was kindly confirmed (from photographs) by John E. Randall (Bishop Museum, Hawaii).

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.UMR 7138 Systématique, Adaptation, ÉvolutionMuséum National d’Histoire NaturelleParis Cedex 05France
  2. 2.Aquarium des LagonsNouméaNouvelle-Calédonie

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