Abstract
A new genus and species of a common deep-water narcomedusa is described from the Arctic Ocean. The species has four primary tentacles, four secondary tentacles, with three interradial manubrial pouches in each quadrant. A revision and taxonomic key of the family Aeginidae is presented to account for the new genus. Detailed information on its fine-scale vertical and horizontal distributions show that it occurs in a fairly narrow depth range between 1400–2000 meters. The species was observed 423 times at eleven stations, demonstrating that new species can be common in the under-explored regions of the ocean.References
Arai, M.N., Cavey, M.J. & Moore, B.A. (2000) Morphology and distribution of a deep-water Narcomedusa (Solmarisidae) from the northeast Pacific. Scientia Marina, 64, 55–62.
Bigelow, H.B. (1920) Medusae and Ctenophores from the Canadian Arctic Expedition, 1913-1918. Part H. Medusae and Ctenophora. In: Report of the Canadian Arctic Expedition VIII: Mollusks, Echinoderms, Coelenterates, etc. Kings Printer, Ottawa, pp. 3–19.
Bluhm, B.A., Iken, K. & Hopcroft, R.R. (In press) Observations and exploration of the Arctic’s Canada Basin and the Chukchi Sea: the Hidden Ocean and RUSALCA expeditions. Deep-sea research II.
Bouillon, J. (1987) Considérations sur le développement des Narcoméduses et sur leur position phylogénétique. Indo-Malayan Zoology, 4, 189–278.
Bouillon, J., Pagès, F. & Gili, J.M. (2001) New species of benthopelagic hydromedusae from the Weddell Sea. Polar Biology, 24, 839–845.
Bouillon, J., Gravili, C., Pagès, F., Gili, J.M. & Boero, F. (2006) An introduction to Hydrozoa. Mémoires du Muséum national d’Histoire naturelle, 194, 1–591.
Carré, D., Carré, C. & Mills, C.E. (1989) Novel cnidocysts of narcomedusae and a medusivorous ctenophore, and confirmation of kleptocnidism. Tissue and Cell, 21, 723–734.
Collins, A.G. (2002) Phylogeny of Medusozoa and the evolution of cnidarian life cycles. Journal of Evolutionary Biology, 15, 418–432.
Collins, A.G., Bentlage, B., Matsumoto, G.I., Haddock, S.H.D., Osborn, K. & Schierwater, B. (2006a) Solution to the phylogenetic enigma of Tetraplatia, a worm-shaped cnidarian. Biology Letters, 2, 120–124.
Collins, A.G., Schuchert, P., Marques, A.C., Jankowski, T., Medina, M. & Schierwater, B. (2006b) Medusozoan phylogeny and character evolution clarified by new large and small subunit rDNA data and an assessment of the utility of phylogenetic mixture models. Systematic Biology, 55, 97–115.
Collins, A.G., Bentlage, B., Lindner, A., Lindsay, D.J., Haddock, S.H.D., Jarms, G., Norenburg, J.L., Jankowski, T. & Cartwright, P. (2008) Phylogenetics of Trachylina (Cnidaria: Hydrozoa) with new insights on the evolution of some problematical taxa. Journal of the Marine Biological Association of the United Kingdom, 88, 1673–1685.
Daly, M., Brugler, M.R., Cartwright, P., Collins, A.G., Dawson, M.N., Fautin, D.G., France, S.C., McFadden, C.S., Opresko, D.M., Rodrigues, E., Romano, S.L. & Stake, J.L. (2007) The phylum Cnidaria: a review of phylogenetic patterns and diversity 300 years after Linnaeus. Zootaxa, 1668, 127–182.
Fuentes, V. & Pagès, F. (2006) Description of Jubanyella plemmyris gen. nov. et sp. nov. (Cnidaria: Hydrozoa: Narcomedusae) from a specimen stranded off Jubany Antarctic station, with a new diagnosis for the family Aeginidae. Journal of Plankton Research, 28, 959–963.
Grainger, E.H. (1965) Zooplankton from the Arctic Ocean and adjacent Canadian waters. Journal of Fisheries Resources of Canada, 22, 543–564.
Haddock, S.H.D. (2007) Comparative feeding behavior of planktonic ctenophores. Integr. Comp. Biol., 47, 847–853.
Holland, J.S. (2006) Ice-Water Aliens. National Geographic Magazine, December, 210, p.26.
Kitamura, M., Miyake, H., and Lindsay, D.J. (2008) Cnidaria in: Deep-sea life -Biological observations using research submersibles. (eds Fujikura K, Okutani T, Maruyama T). Tokai University Press, Kanagawa, p. 295–320.
Kosobokova, K.N., Hanssen, H., Hirche, H.-J. & Knickmeier, K. (1998) Composition and distribution of zooplankton in the Laptev Sea and adjacent Nansen Basin during summer, 1993. Polar Biol., 19, 63–73.
Kosobokova, K. & Hirche, H.J. (2000) Zooplankton distribution across the Lomonosov Ridge, Arctic Ocean: species inventory, biomass and vertical structure. Deep-Sea Research Part I-Oceanographic Research Papers, 47, 2029–2060.
Kosobokova, K.N. & Hopcroft, R.R. (In press) Diversity and vertical distribution of mesozooplankton in the Arctic’s Canada Basin. Deep-sea research II.
Lindsay, D.J. & Hunt, J.C. (2005) Biodiversity in midwater cnidarians and ctenophores: submersible based results from deep-water bays in the Japan Sea and north-western Pacific. Journal of the Marine Biological Association of the United Kingdom, 85, 503–517.
Lindsay, D.J. & Miyake, H. (2009) A checklist of midwater cnidarians and ctenophores from Japanese waters -species sampled during submersible surveys from 1993–2008 with notes on their taxonomy. Kaiyo Monthly 41(8): 417–438.
Lindsay, D.J., Pagès, F., Corbera, J., Miyake, H., Hunt, J.C., Ichikawa, T., Segawa, K. & Yoshida, H. (2008) The anthomedusan fauna of the Japan Trench: preliminary results from in situ surveys with manned and unmanned vehicles. Journal of the Marine Biological Association of the United Kingdom, 88, 1519–1539
MacGinitie, G.E. (1955) Distribution and ecology of the marine invertebrates of Point Barrow, Alaska. Smithsonian Miscellaneous Collections, 128, 1–201.
Mills, C.E. (1981) Diversity of swimming behaviors in hydromedusae as related to feeding and utilization of space. Marine Biology, 64, 185–189.
Mills, C.E. & Goy, J. (1988) In situ observations of the behavior of mesopelagic Solmissus narcomedusae (Cnidaria, Hydrozoa). Bulletin of Marine Science, 43, 739–751.
Purcell, J.E. & Mills, C.E. (1988) The correlation between nematocyst types and diets in pelagic hydrozoa. In: Hessinger, D.A. & Lenhoff, H.M. (Eds.) The biology of nematocysts. Academic Press, New York, pp. 463–485.
Raskoff, K.A. (2002) Foraging, prey capture, and gut contents of the mesopelagic narcomedusa, Solmissus spp. (Cnidaria: Hydrozoa). Marine Biology, 141, 1088–1107.
Raskoff, K.A., Hopcroft, R.R., Kosobokova, K.N., Purcell, J.E. & Youngbluth, M. (In press) Jellies under ice: ROV observations from the Arctic 2005 Hidden Ocean Expedition. Deep-sea research II, doi:10.1016/j.dsr2.2009.08.010.
Raskoff, K.A., Purcell, J.E. & Hopcroft, R.R. (2005) Gelatinous zooplankton of the Arctic Ocean: in situ observations under the ice. Polar Biology, 28, 207–217.
Raskoff, K.A., Sommer, F.A., Hamner, W.M. & Cross, K. (2003) Collection and culture techniques for gelatinous zooplankton. Biological Bulletin, 204, 68–80.
Robison, B.H. (2004) Deep pelagic biology. Journal of Experimental Marine Biology and Ecology, 300, 253–272.
Schuchert, P. (2009) The Hydrozoa Directory, Version 18. Available from: http://www.ville-ge.ch/mhng/hydrozoa/hydrozoa-directory.htm (accessed June 24, 2009)
Shirley, W.D. & Leung, Y.-M. (1970) Medusae of the Central Arctic. In: H.A., K. (Ed.) Taxonomic Guides to Arctic Zooplankton. II. Technical Report University of Southern California, Department of Biological Sciences, 51.
Søreide, J., Hop, H., Falk-Petersen, S., Gulliksen, B. & Hansen, E. (2003) Macrozooplankton communities and environmental variables in the Barents Sea marginal ice zone in late winter and spring. Marine Ecology Progress Series, 263, 43–64.
Stepanjants, S.D. (1989) Hydrozoa of the Eurasian Arctic Seas. In: Herman, Y. (Ed.) The Arctic seas : climatology, oceanography, geology, and biology. Van Nostrand Reinhold, New York, pp. 397–430.
Uchida, T. (1969) Medusae from the Arctic Ocean. Publications of the Seto Marine Biological Laboratory, 17, 285–287.
Xu, Z. & Zhang, J. (1978) On the hydromedusae, siphonophores and scyphomedusae from the coast of the east Guangdong province and South Fujian province, China. Acta scientiarum naturalium, Universitatis Amoiensis, 17, 19–64.