Abstract
A new genus and species Neobrychiopontius galeronae gen. nov. sp. nov. is described based on female specimens from the Pacific nodule province associated with the abyssal holothurian Oneirophanta cfr. setigera (Ludwig, 1894) (Elasipodida, Deimatidae). The holothurian and copepods were collected at a depth of 4978 m during the cruise “Nodinaut” (Ifremer, 17 May – 28 June 2004) on RV Atalante using a spade corer operated from the submersible Nautile. The new genus has retained a greater number of plesiomorphic characters, when compared to its closest relative the monotypic genus Brychiopontius Humes, 1974 from the abyssal zone of the North Atlantic: proximal 3 segments of antennule articulates (fused in Brychiopontius), well developed mandibular palp and inner lobe of maxilla (both absent in Brychiopontius). On the other hand the new genus has only 2 outer spines on the third exopodal segment of leg 1 (instead of 3 in Brychiopontius). Two plesiomorphic characters hitherto unknown for the order Siphonostomatoida are present in the new genus viz. the inner lobe of the first segment of the maxilla is armed with 2 setae and the first segment of the mandibular palp is armed with 1 seta. Neobrychiopontius galeronae gen. et sp. nov. is the second species of Siphonostomatoida found in association with abyssal holothurians (both belonging to the genus Oneirophanta) and represents the first record of the family Brychiopontiidae in the Pacific Ocean.References
Boxshall, G.A. & Halsey, S.H. (2004) An Introduction to Copepod Diversity. The Ray Society, London, 966 pp.
Boxshall, G.A., Ohtsuka, S. (2001) Two new families of copepods (Copepoda: Siphonostomatoida) parasitic on echinoderms. Journal of Crustacean Biology, 21(1), 96–105.
Brady, G.S. (1880) A monograph of the free and semi-parasitic Copepoda of the British Islands. The Ray Society, London, 3, 83 pp.
Burmeister, H. (1835) Beschreibung einiger neuer oder weniger bekannter Schmarotzerkrebse, nebst allgemeine Betrachtungen über die Gruppe, welcher sie angehören. Nova Acta Physico-Medica Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum (Acta der Kaiserlichen Leopoldinisch-Carolinischen Deutschen Akademie der Naturforscher), 17, 269–336.
Canu, E. (1893) Un Copépode ascomyzontide sur une algue pélagique. Annales de la Station Aquicole de Boulogne-sur-Mer, 1(2), 100–107.
Claus C. (1889) Über neue oder wenig bekannte halbparasitische Copepoden insbesondere der Lichomolgiden- und Ascomyzontiden-Gruppe. Arbeiten aus dem Zoologischen Institut der Universitat Wien und der Zoologischen Station in Triest. 8, 327–370.
Giesbrecht W. (1895) The subfamilies, genera, and species of the copepod family Ascomyzontidae Thorell: diagnosis, synonymy, and distribution. Annals and Magazine of Natural History, 6(16), 173–186.
Giesbrecht, W. (1899) Die Asterocheriden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna und Flora des Golfes von Neapel und der angrenzenden Meeres-Abschnitte, 25, 217 pp.
Hansen, B. (1975) Systematics and biology of the deep-sea holothurians. Galathea Report, 13, 1–262.
Heptner, M.V. (1968) Description and functional morphology of Megapontius pleurospinosus sp. n. from the Pacific with some remarks on the status of genus Megapontius within the system of families of Siphonostoma group (Copepoda, Cyclopoida). Zoologicheskii Zhurnal, 47 (11), 1628–1638.
Humes, A. G. (1974) New cyclopoid copepods associated with an abyssal holothurian in the eastern North Atlantic. Journal of Natural History, 8, 101–117.
Humes, A. G. (1980) A review of the copepods associated with holothurians, including new species from the Indo-Pacific. Beaufortia, 30, 31–123.
Humes, A.G. (1987a) Copepoda associated with crinoid echinoderms in the western Pacific. Publications of the Seto Marine Biological Laboratory, 32(1–3), 63–108.
Humes, A.G. (1987b) Copepoda from deep-sea hydrothermal vents. Bulletin of Marine Science, 41, 645–788.
Humes, A.G. (1988) Bythocheres prominulus, a new genus and species (Copepoda: Siphonostomatoida) from deep-water cold seeps at the West Florida Escarpment. Proceedings of the Biological Society of Washington, 101 (3), 568–575.
Humes, A.G. (1989) Copepoda from deep-sea hydrothermal vents at the East Pacific Rise. Bulletin du Museum national d'Histoire naturelle, Paris, 4e série, section A, 4, 829–849.
Humes A.G. (1998) Copepoda (Siphonostomatoida) associated with Ophiuroidea in Jamaica, Puerto Rico, and Barbados. Zoologische Verhandelingen, 323, 365–382.
Humes, A.G. & Cressey, R.F. (1958) A new family containing two new genera of cyclopoid copepods parasitic on starfishes. Journal of Parasitology, 44 (4), 395–408.
Humes, A.G. & Cressey, R.F. (1959) A new family and genus of cyclopoid copepods parasitic on a holothurian. Journal of Parasitology, 45 (2), 209–216.
Humes, A.G. & Dojiri, M. (1980) A new siphonostome family (Copepoda) associated with a vestimentiferan in deep water off California. Pacific Science, 34, 143–151.
Humes, A.G. & Stock, J.H. (1991) Coralliomyzontidae, fam. n. (Copepoda: Siphonostomatoida), associated with scleractinian corals in Madagascar. Bull. Zool. Univ. Amsterdam, 13, 17–24.
Huys, R. (1988) On the identity of the Namakosiramiidae Ho & Perkins 1977 (Crustacea, Copepoda) including a review of harpacticoid associates of Echinodermata. Journal of Natural History, 22(6), 1517-1532.
Ivanenko V.N. (1999) Comparative analysis of the antennules of the asterocherid females (Copepoda, Siphonostomatoida) - symbionts of marine invertebrates. In F.R. Schram and J.C. von Voupel Klein (Eds.) Crustaceans and the Biodiversity Crisis. Proceedings of the Fourth International Crustacean Congress, Amsterdam, The Netherlands, July 20-24, 1998, Vol. I. Koninklijke Brill, Leiden, pp. 207–216.
Ivanenko V.N., Ferrari F.D., Smurov A.V. (2001) Nauplii and copepodids of Scottomyzon gibberum (Copepoda: Siphonostomatoida: Scottomyzontidae, new family), a symbiont of Asterias rubens (Asteroidea). Proceedings of the Biological Society of Washington, 114 (1), 237–261.
Ivanenko, V.N. & Defaye, D. (2004) A new genus and species of the family Asterocheridae (Copepoda: Siphonostomatoida) from the East Equatorial Atlantic (Angola margin). Crustaceana, 77 (9), 1131–1144.
Ivanenko, V.N. & Defaye, D. (2006) Copepoda. In: Desbruyères, D. Segonzac, M. & Bright, M. (Ed.) Handbook of Deep-Sea Hydrothermal Vent Fauna. Second completely revised edition. Denisia, 18, pp. 318–355.
Ludwig, H. (1894) Reports on a exploration of the west coast of Mexico, Central and South America, and off the Galapagos Islands in charge of Alexander Agassiz by the U.S. Fish Commission Steamer "Albatross" during 1891. XII. The Holothurioidea. Memoirs of the Museum of Comparative Zoology at Harvard College, XVII (3), 1–183.
Stock, J.H. (1966) Cyclopoida siphonostoma from Mauritius (Crustacea, Copepoda). Beaufortia, 13 (159), 145–194.
Stock, J.H. (1968) The Calvocheridae, a family of copepods inducing galls in sea-urchin spines. Bijdragen tot de Dierkunde, 38, 85–90.
Stock, J.H. (1971) Collocherides astroboae n. gen., n. sp., a siphonostome cyclopoid copepod living in the stomach of basket stars. Bijdragen tot de Dierkunde, 41, 19–22.
Veillette, J., Sarrazin, J., Gooday, A.J., Galéron, J., Caprais, J.-C., Vangriesheim, A., Étoubleaub, J., Christiand, J.R. & Junipera S.K. (2007) Ferromanganese nodule fauna in the Tropical North Pacific Ocean: Species richness, faunal cover and spatial distribution. Deep Sea Research Part I: Oceanographic Research Papers, 54 (11), 1912-1935.