Systematic Parasitology

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A redescription of Pseudorhabdosynochus epinepheli (Yamaguti, 1938), the type-species of Pseudorhabdosynochus Yamaguti, 1958 (Monogenea: Diplectanidae), and the description of P. satyui n. sp. from Epinephelus akaara off Japan

  • Jean-Lou JustineEmail author


Pseudorhabdosynochus epinepheli (Yamaguti, 1938) has been recorded from a variety of hosts, mainly groupers. All type-specimens of Diplectanum epinepheli Yamaguti, 1938, Pseudorhabdosynochus epinepheli Yamaguti, 1958 and Cycloplectanum hongkongensis Beverley-Burton & Suriano, 1981 are figured: it is concluded, as did Kritsky & Beverley-Burton (1986), that the three species are synonymous. In addition, numerous monogenean specimens from a deep-sea grouper, Epinephelus chlorostigma, collected off New Caledonia, South Pacific, were prepared using various methods and described. These specimens are also conspecific with P. epinepheli (Yamaguti, 1938) and represent a new geographical record. This species has a sclerotised vagina with a very characteristic primary chamber. The simultaneous presence of P. lantauensis (Beverley-Burton & Suriano, 1981) and P. epinepheli was noted in both type-slides of D. epinepheli from Japan (host: E. akaara) and C. hongkongensis from Hong Kong (host: E. bruneus). Several causes are suspected for the alleged ‘generalist’ character of P. epinepheli, including the misidentification of either fish or monogeneans and the accidental exchanges of monogeneans between fishes of different species kept alive in the same tank. Finally, the confirmed list of hosts of P. epinepheli includes E. akaara, E. awoara and E. chlorostigma; it is suggested that the latter, a widespread deep-sea fish, serves as a reservoir for the infection of the other species, which are associated with shallow waters. P. satyui n. sp. is described from two specimens found on slides from E. akaara (from the Inland Sea of Japan) deposited by Yamaguti; the new species has a sclerotised vagina with characteristic spherical chambers.


Picrate Outer Length Vitelline Field Primary Canal Secondary Canal 
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Pseudorhabdosynochus epinepheli (Yamaguti, 1938) a été mentionné chez différents hôtes, surtout des mérous. Tous les spécimens-types de Diplectanum epinepheli Yamaguti, 1938, Pseudorhabdosynochus epinepheli Yamaguti, 1958 et Cycloplectanum hongkongensis Beverley-Burton & Suriano, 1981 sont figurés, et on conclut, comme Kritsky & Beverley-Burton (1986), que les trois espèces sont synonymes. De plus, de nombreux spécimens de monogènes collectés chez un mérou de profondeur, Epinephelus chlorostigma, de Nouvelle-Calédonie, Pacifique Sud, ont été préparés avec des méthodes variées. Ces spécimens sont aussi conspécifiques de P. epinepheli (Yamaguti, 1938) et la Nouvelle-Calédonie représente une nouvelle mention géographique. L’espèce a une vagin sclérifié avec une chambre primaire très caractéristique. La présence simultanée de P. lantauensis (Beverley-Burton & Suriano, 1981) et P. epinepheli a été notée dans les lames-types de D. epinepheli du Japon (hôte, E. akaara) et de C. hongkongensis de Hong-Kong (hôte, E. bruneus). Plusieurs causes sont soupçonnées pour le caractère prétendument ‘généraliste’ de P. epinepheli, dont les mauvaises identifications de poissons, des monogènes, et l’échange accidentel de monogènes chez des poissons gardés vivants ensemble dans un même contenant. Finalement, la liste des hôtes confirmés de P. epinepheli comprend E. akaara, E. awoara et E. chlorostigma. On fait l’hypothèse que E. chlorostigma, espèce de profondeur, a servi de réservoir pour l’infestation des autres espèces, plus associées aux eaux peu profondes. P. satyui n. sp. est décrit de deux spécimens trouvés dans des lames de parasites de E. akaara (de la mer intérieure du Japon) déposées par Yamaguti. La nouvelle espèce a un vagin sclérifié avec des chambres sphériques caractéristiques.



Sophie Olivier, a student, participated in the fishing operations and parasitological survey and skilfully helped in the preparation of slides. Sam Tereua (IRD) provided safe navigation and excellent fishing skills on board the R/V ‘Coris’. The identification of the host was kindly confirmed (from photographs) by John E. Randall (Bishop Museum, Hawaii). David Gibson (BMNH) kindly provided literature. Annemarie Ohler (MNHN) helped with nomenclatural aspects. Japanese parasitologists (Drs Iwaki, Machida and Araki) confirmed that the dedication of the new species to the first name of S. Yamaguti was considered honourable in terms of Japanese culture.


  1. Al-Mathal, E. M. (2002). Identification of some monogenetic trematodes from some Arabian Gulf fish in Saudi Arabia. Journal of the Egyptian Society of Parasitology, 32, 959–967.PubMedGoogle Scholar
  2. Beverley-Burton, M., & Suriano, D. M. (1981). A revision of Cycloplectanum Oliver, 1968 (Monogenea: Diplectanidae) and descriptions of C. hongkongensis n. sp. and C. lantauensis n. sp. from Epinephelus spp. (Serranidae) in the South China Sea. Canadian Journal of Zoology, 59, 1276–1285.CrossRefGoogle Scholar
  3. Heemstra, P. C., & Randall, J. E. (1993). FAO Species Catalogue. Vol. 16. Groupers of the world (Family Serranidae, Subfamily Epinephelinae). An annotated and illustrated catalogue of the grouper, rockcod, hind, coral grouper and lyretail species known to date. FAO Fisheries Synopsis No. 125. Rome: FAO, 382 pp.Google Scholar
  4. Hinsinger, D. D., & Justine, J.-L. (2006a). The ‘Pseudorhabdosynochus cupatus group’ (Monogenea: Diplectanidae) on Epinephelus fasciatus, E. howlandi, E. rivulatus and E. merra (Perciformes: Serranidae) off New Caledonia, with descriptions of Pseudorhabdosynochus cyathus n. sp. and P. calathus n. sp. Systematic Parasitology, 64(2), 69–90.PubMedCrossRefGoogle Scholar
  5. Hinsinger, D. D., & Justine, J.-L. (2006b). Pseudorhabdosynochus venus n. sp. (Monogenea : Diplectanidae) from Epinephelus howlandi (Perciformes: Serranidae) off New Caledonia. Systematic Parasitology, 63, 155–160.PubMedCrossRefGoogle Scholar
  6. International Commission on Zoological Nomenclature. (1999). International code of zoological nomenclature. The International Trust for Zoological Nomenclature, 306 pp.Google Scholar
  7. Isshiki, T., Nagano, T., & Miki, K. (2007). Occurrence of a monogenean gill parasite Pseudorhabdosynochus epinepheli on red spotted grouper Epinephelus akaara and its experimental treatment by hydrogen peroxide bathing. Fish Pathology, 42, 71–74.CrossRefGoogle Scholar
  8. Justine, J.-L. (2005a). Species of Pseudorhabdosynochus Yamaguti, 1958 (Monogenea: Diplectanidae) from Epinephelus fasciatus and E. merra (Perciformes: Serranidae) off New Caledonia and other parts of the Indo-Pacific Ocean, with a comparison of measurements of specimens prepared using different methods, and a description of P. caledonicus n. sp. Systematic Parasitology, 62, 1–37.PubMedCrossRefGoogle Scholar
  9. Justine, J.-L. (2005b). Pseudorhabdosynochus hirundineus n. sp. (Monogenea: Diplectanidae) from Variola louti (Perciformes: Serranidae) off New Caledonia. Systematic Parasitology, 62, 39–45.PubMedCrossRefGoogle Scholar
  10. Justine, J.-L. (2007a). Parasite biodiversity in a coral reef fish: twelve species of monogeneans on the gills of the grouper Epinephelus maculatus (Perciformes: Serranidae) off New Caledonia, with a description of eight new species of Pseudorhabdosynochus (Monogenea: Diplectanidae). Systematic Parasitology, 66, 81–129.PubMedCrossRefGoogle Scholar
  11. Justine, J.-L. (2007b). Pseudorhabdosynochus argus n. sp. (Monogenea: Diplectanidae) from Cephalopholis argus, P. minutus n. sp. and Diplectanum nanus n. sp. from C. sonnerati and other monogeneans from Cephalopholis spp. (Perciformes: Serranidae) off Australia and New Caledonia. Systematic Parasitology, 68, 195–215.PubMedCrossRefGoogle Scholar
  12. Justine, J.-L. (2007c). 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. Systematic Parasitology, 67, 187–209.PubMedCrossRefGoogle Scholar
  13. Justine, J.-L. (2008a). Diplectanum parvus sp. nov. (Monogenea, Diplectanidae) from Cephalopholis urodeta (Perciformes, Serranidae) off New Caledonia. Acta Parasitologica, 53, 127–132.CrossRefGoogle Scholar
  14. Justine, J.-L. (2008b). Two new species of Pseudorhabdosynochus Yamaguti, 1958 (Monogenea: Diplectanidae) from the deep-sea grouper Epinephelus morrhua (Perciformes: Serranidae) off New Caledonia. Systematic Parasitology, 71, 145–158.PubMedCrossRefGoogle Scholar
  15. Justine, J.-L., & Sigura, A. (2007). Monogeneans of the malabar grouper Epinephelus malabaricus (Perciformes, Serranidae) off New Caledonia, with a description of six new species of Pseudorhabdosynochus (Monogenea: Diplectanidae). Zootaxa, 1543, 1–44.Google Scholar
  16. Kritsky, D. C., & Beverley-Burton, M. (1986). The status of Pseudorhabdosynochus Yamaguti, 1958, and Cycloplectanum Oliver, 1968 (Monogenea: Diplectanidae). Proceedings of the Biological Society of Washington, 99, 17–20.Google Scholar
  17. Kritsky, D. C., Boeger, W. A., & Robaldo, R. B. (2001). Neotropical Monogenoidea. 38. Revision of Rhabdosynochus Mizelle and Blatz, 1941 (Polyonchoinea: Dactylogyridea: Diplectanidae), with descriptions of two new species from Brazil. Comparative Parasitology, 68, 66–75.Google Scholar
  18. Kritsky, D. C., Jimenez-Ruiz, F. A., & Sey, O. (2000). Diplectanids (Monogenoidea: Dactylogyridea) from the gills of marine fishes of the Persian Gulf off Kuwait. Comparative Parasitology, 67, 145–164.Google Scholar
  19. Laboute, P., & Grandperrin, R. (2000). Poissons de Nouvelle-Calédonie. Nouméa, New Caledonia: Éditions Catherine Ledru, 520 pp.Google Scholar
  20. Leong, T. S. (1997). Control of parasites in cultured marine finfishes in Southeast Asia - an overview. International Journal for Parasitology, 27, 1177–1184.CrossRefGoogle Scholar
  21. Leong, T. S., & Wong, S. Y. (1988). A comparative study of the parasite fauna of wild and cultured grouper (Epinephelus malabaricus Bloch et Schneider) in Malaysia. Aquaculture, 68, 203–207.CrossRefGoogle Scholar
  22. Lerssutthichawal, T., & Chinabut, S. (2004). Diplectanids from orange-spotted grouper Epinephelus coioides cultured along the West coast of Thailand. Paper presented at the 7th Asian fisheries forum, 2004.Google Scholar
  23. Li, G., & Li, Z. (1991). Scanning electron microscopy of Cycloplectanum lantauensis and C. hongkongensis from Epinephelus spp. Annual Bulletin of the Society of Parasitology, Guangdong Province, 11–13, 189–191 (in Chinese).Google Scholar
  24. Li Z. C., Yan P. H., Liu L., & Yu X. D. (1995). Monogenoids of Chinese marine fishes. V. Some monogenean of the families Diplectanidae and Ancyrocephalidae from sparid and serranid in South China Sea. Proceedings of the Tenth Anniversary of the Founding of China Parasitological Society (1985–1995) (pp. 88–92). Beijing: Science Press. (in Chinese).Google Scholar
  25. Malmberg, G. (1957). Om förekomsten av Gyrodactylus på svenska fiskar. Skrifter Utgivna av Södra Sveriges Fiskeriförening, Årsskrift, 1956, 19–76 (in Swedish).Google Scholar
  26. Neifar, L., & Euzet, L. (2007). Five new species of Pseudorhabdosynochus (Monogenea: Diplectanidae) from the gills of Epinephelus costae (Teleostei: Serranidae). Folia Parasitologica, 54, 117–128.PubMedGoogle Scholar
  27. Oliver, G. (1968). Recherches sur les Diplectanidae (Monogenea) parasites de téléostéens du Golfe du Lion. I. Diplectaninae Monticelli, 1903. Vie et Milieu, Série A, 19, 95–138.Google Scholar
  28. Oliver, G. (1987). Les Diplectanidae Bychowsky, 1957 (Monogenea, Monopisthocotylea, Dactylogyridea). Systématique. Biologie. Ontogénie. Écologie. Essai de phylogenèse. Thèse d’État, Académie de Montpellier, Université des Sciences et Techniques du Languedoc, 433 pp.Google Scholar
  29. Rasband, W. S. (1997–2007). ImageJ. U. S. National Institutes of Health, Bethesda, Maryland, USA:
  30. Ruangpan, L., & Tubkaew, R. (1993). Parasites of the cage cultured grouper Epinephelus malabaricus in Thailand. Paper presented at the proceedings of grouper culture, Kaoseng, Songkhla, Thailand.Google Scholar
  31. Rückert, S. (2006). Marine Fischparasiten in Indonesien: Befallssituation und Bedeutung für die Marikultur von Zackenbarschen. Thesis, University of Düsseldorf, Germany, 240 pp.Google Scholar
  32. Sigura, A., Chauvet, C., & Justine, J.-L. (2007). Pseudorhabdosynochus bacchus sp. nov. (Monogenea, Diplectanidae) from Epinephelus coeruleopunctatus (Perciformes, Serranidae) off New Caledonia. Acta Parasitologica, 52, 196–200.CrossRefGoogle Scholar
  33. Sigura, A., & Justine, J. L. (2008a). Monogeneans of the speckled blue grouper, Epinephelus cyanopodus (Perciformes, Serranidae), from off New Caledonia, with a description of four new species of Pseudorhabdosynochus and one new species of Laticola (Monogenea: Diplectanidae), and evidence of monogenean faunal changes according to the size of fish. Zootaxa, 1695, 1–44.Google Scholar
  34. Yamaguti, S. (1938). Studies on the helminth fauna of Japan. Part 24. Trematodes of fishes, V. Japanese Journal of Zoology, 8, 15–74.Google Scholar
  35. Yamaguti, S. (1958). Studies on the helminth fauna of Japan. Part 53. Trematodes of fishes, XII. Publications of the Seto Marine Biological Laboratory, 7, 53–88.Google Scholar
  36. Yamaguti, S. (1968). Monogenetic trematodes of Hawaiian fishes (287 pp). Honolulu: University of Hawaii Press.Google Scholar
  37. Yang, T. B., Gibson, D. I., & Zeng, B. J. (2005). Pseudorhabdosynochus summanoides n. sp (Monogenea: Diplectanidae) from Epinephelus coioides in Dapeng Bay, South China Sea, with observations on several similar species of Pseudorhabdosynochus Yamaguti, 1958. Systematic Parasitology, 62, 221–239.CrossRefGoogle Scholar
  38. Yang, T. B., Kritsky, D. C., Sun, Y., Zhang, J. Y., Shi, S. H., & Agrawal, N. (2006). Diplectanids infesting the gills of the barramundi Lates calcarifer (Bloch) (Perciformes: Centropomidae), with the proposal of Laticola n. g. (Monogenoidea: Diplectanidae). Systematic Parasitology, 63, 127–141.Google Scholar
  39. Yang, T., Lin, L., Chen, Y., & Liu, S. (2003). Effect of formalin treatment on the monogenean Pseudorhabdosynochus epinepheli (Monogenea) and the fish Epinephelus coioides. Acta Scientiarum Naturalium Universitatis Sunyatseni, 42, 59–63 (in Chinese).Google Scholar
  40. Zeng, B. J., & Yang, T. B. (2007). Description of Pseudorhabdosynochus justinei n. sp. (Monogenea: Diplectanidae) and redescription of P. vagampullum (Young, 1969) Kritsky & Beverley-Burton, 1986 from the gills of the longfin grouper Epinephelus quoyanus (Valenciennes) (Perciformes: Serranidae) in Dapeng Bay, South China Sea. Systematic Parasitology, 66, 223–225.PubMedCrossRefGoogle Scholar
  41. Zhang, J., Yang, T., Liu, L., & Ding, X. (2003). A list of monogeneans from Chinese marine fishes. Systematic Parasitology, 54, 111–130.CrossRefGoogle Scholar
  42. Zhang, J. Y., Yang, T. B., & Liu, L. (2001). Monogeneans of Chinese marine fishes. Beijing: Agriculture Press, 400 pp (in Chinese).Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Équipe Biogéographie Marine Tropicale, Unité Systématique, Adaptation, Évolution (CNRS, UPMC, MNHN, IRD)Institut de Recherche pour le DéveloppementNouméa CedexNouvelle-Calédonie

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