Four species of Pseudorhabdosynochus (Monogenea: Diplectanidae) from the camouflage grouper Epinephelus polyphekadion (Perciformes: Serranidae) off New Caledonia

  • Charlotte Schoelinck
  • Jean-Lou Justine


Gill diplectanid monogeneans from the camouflage grouper Epinephelus polyphekadion (Bleeker) collected in the coral reef lagoon of New Caledonia, South Pacific, comprise four species. Very few monogeneans were found in most fish examined. Pseudorhabdosynochus dionysos n. sp. has a sclerotised vagina with a robust trumpet, a robust primary canal and two chambers of similar size; it is close to P. bacchus Sigura, Chauvet & Justine, 2007. P. viscosus n. sp. has a sclerotised vagina with a robust trumpet, long primary canal with an extremely thin wall and two small chambers, and a male quadriloculate organ with a characteristic thickening at the extremity of its cone. P. crassus n. sp., the most abundant species, has a sclerotised vagina with a thin-walled trumpet, thin-walled primary canal which is always coiled anteriorly and two small chambers. P. huitoe Justine, 2007, P. manifestus Justine & Sigura, 2007 and P. crassus have very similar sclerotised vaginae; however, species of this ‘huitoe complex’ can be distinguished by measurements of the haptoral hard parts. A few diplectanid specimens found in a single specimen of E. polyphekadion were attributed to P. huitoe, a species originally described from E. maculatus (Bloch) and also rarely found in E. cyanopodus Richardson in New Caledonia; specimens from these three fish species are morphologically indistinguishable.


Accessory Structure Vitelline Field Primary Canal Secondary Canal Marginal Hooklet 
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Les monogènes Diplectanidae des branchies de la loche crasseuse Epinephelus polyphekadion (Bleeker), pêchée dans le lagon corallien de Nouvelle-Calédonie, Pacifique Sud, comprennent quatre espèces. Les monogènes étaient très peu nombreux sur la plupart des poissons examinés. Pseudorhabdosynochus dionysos n. sp. a un vagin sclérifié avec trompette et canal primaire robustes et deux chambres de taille comparable; l’espèce est proche de P. bacchus Sigura, Chauvet & Justine, 2007. P. viscosus n. sp. a un vagin sclérifié avec trompette robuste, canal primaire long à paroi extrêmement fine et deux petites chambres, et un organe mâle tétraloculé avec un épaississement caractéristique à l’extrémité de son cône. P. crassus n. sp., l’espèce la plus abondante, a un vagin sclérifié avec une trompette à paroi fine, un canal primaire à paroi fine toujours enroulé dans sa partie antérieure et deux petites chambres. P. huitoe Justine, 2007, P. manifestus Justine & Sigura, 2007 et P. crassus ont des vagins sclérifiés très semblables, mais les espèces de ce « complexe huitoe » peuvent être distinguées par des mesures des parties dures du hapteur. Quelques spécimens de Diplectanidae, trouvés dans un seul spécimen de E. polyphekadion, ont été attribués à P. huitoe, une espèce originellement décrite de E. maculatus (Bloch) et aussi trouvée rarement chez E. cyanopodus Richardson; les spécimens provenant de ces trois espèces de poissons ne sont pas morphologiquement différenciables.



The students, Julie Mounier, Charles Beaufrère, Damien Hinsinger, Lenaïg Hemery, Géraldine Colli and Émilie Henry, participated in the fishing operations and parasitological survey. Louis Euzet helped with the examination of specimens, and Claude Chauvet provided certain fish. The identification of certain 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. 2011

Authors and Affiliations

  1. 1.UMR 7138 Systématique, Adaptation, ÉvolutionMuséum National d’Histoire NaturelleParis Cedex 05France
  2. 2.Aquarium des LagonsNouméaNew Caledonia

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