Abstract
A new ampeliscid species (Amphipoda, Gammaridea) was recovered in high densities from a depth of about 480 m at the Mississippi Canyon (28 32' N, 89 49' W). Ampelisca mississippiana is described and illustrated based on specimens collected from the head of the canyon, where the species formed an ampeliscid mat with average densities of 12,000 ind. m -2 . Ampelisca mississippiana resembles A. pugetica Stimpson, 1864, and A. mexicana Barnard, 1954a, but differs in the shape of the head, absence of corneal lenses, relative lengths of antennae 1 and 2, shape of the segments of pereopods 7, and shape of the carina of the urosome. The new species also resembles Ampelisca uncinata Chevreux, 1887, but differs in the shape of the head, the dorsal carina of pleon segment 4, features of some segments of pereopod 7, the second uropod and the mouthparts.References
Barnard, J.L. (1954a) Amphipoda of the family Ampeliscidae collected by the Velero III in the Caribbean Sea. Allan Hancock Atlantic Expedition Report, 7, 1–13.
Barnard, J.L. (1954b) Amphipoda of the family Ampeliscidae collected in the eastern Pacific Ocean by the Velero III and Velero IV. Allan Hancock Pacific Expedition Report, 18, 1–137.
Barnard, J.L. (1960) New bathyal and sublittoral ampeliscid amphipods from California, with an illustrated key to Ampelisca. Pacific Naturalist, 1, 1–36.
Barnard, J.L & J.D. Thomas (1989). A new species, Ampelisca burkei, (Crustacea: Amphipoda) from Florida. Proceedings of the Biological Society of Washington, 102, 375–384.
Bellan-Santini D., Karaman G., Krapp-Schickel G., Ledoyer M., Myers A. A., Ruffo S. & Schieke U. (1982) Gammaridea (Acanthonotozomatidae to Gammaridae). In: Ruffo S. (ed.), The Amphipoda of the Mediterranean, Part 1, Memoires de l'Institut oceanographique, Monaco, 13: i–xiv + 1 map + 1–364.
Boland, G. & Rowe, G. T. (1991) Deep-sea benthic sampling with the GOMEX box corer. Limnology and Oceanography, 35, 1015–1020.
Chevreux, E. (1887) Crustacés amphipods nouveaux, rogués par l’Hirondelle, pendant la campagne de 1886. Bulletin de la Société Zoologique de France, 12, 566–580.
Chevreux, E. (1900). Amphipodes provenant des campagnes de l’Hirondelle (1885–1888). Resultats des Campagnes Scientifique accomplies Par le Prince Albert 1er de Monaco, 16, 1–195.
Dauvin J. C.& Bellan-Santini D. (1988) Illustrated key to Ampelisca species from the north-eastern Atlantic. Journal of the Marine Biological Association of the United Kingdom, 68, 659–676.
Dickinson, J.J. (1982) The systematics and distributional ecology of the family Ampeliscidae (Amphipoda: Gammaridea) in the northeastern Pacific region. 1. The genus Ampelisca. Publications in Biological Oceanography, National Museum of Canada, 10, 1–39.
Gage, J.D. & Tyler P.A. (1991) Deep-sea Biology. Cambridge: Cambridge University Press. 504 pp.
Gardner, W. D. (1989) Periodic resuspension in Baltimore Canyon by focusing of internal waves. Journal of Geophysical Research, 94, 18185–18194.
Goeke, G.D. & R.W. Heard, Jr. (1983) Amphipods of the family Ampeliscidae (Gammaridea). I. Ampelisca bicarinata, a new species of amphipod from the Gulf of Mexico. Gulf Research Report, 7, 217–223.
Holmes, S. J. (1908) The Amphipoda collected by the U.S. Bureau of Fisheries Steamer Albatross off the west coast of North America, in 1903 and 1904, with description of a new family and several new genera and species. Proceedings of the United Sates National Museum, 35, 489–543, 46 text figs.
Kaïm-Malka, R.A. (2000) Elevation of two eastern Atlantic varieties of Ampelisca brevicornis (Costa, 1853) (Crustacea: Amphipoda) to full specific rank with redescription of the species. Journal of Natural History, 34, 1939–1966.
Lincoln R. (1979) British Marine Amphipoda: Gammaridea. British Museum (Natural History), London, 657 pp
Mills, E.I. (1963) A new species of Ampelisca (Crustacea: Amphipoda) from eastern North America, with notes on other species in the genus. Canadian Journal of Zoology, 41, 971–989.
Mills, E.I. (1964) Ampelisca abdita, a new amphipod crustacean from eastern North America. Canadian Journal of Zoology, 42, 559–575.
Mills, E.I. (1965) The zoogeography of North Atlantic and North Pacific ampeliscid amphipod crustaceans. Systematic Zoology, 14, 119–130.
Mills, E.I. (1967a) The biology of an amphipod ampeliscid crustacean sibling species pair. Journal of Fisheries Research Board of Canada, 24, 305–355.
Mills, E.I. (1967b). A reexamination of some species of Ampelisca (Crustacea: Amphipoda) from the east coast of North America. Canadian Journal of Zoology, 45, 635–652.
Mills, E.I. (1971) Deep-sea Amphipoda from the western North Atlantic Ocean. The family Ampeliscidae. Limnology and Oceanography, 16, 357–386.
Reid, D.M. (1951) Report on the Amphipoda (Gammaridea and Caprellidea) of the coast of tropical West Africa. Atlantide Report, 2, 189–291.
Sars, G.O. (1882) Oversigt af Norges Crustaceers med forlobige Bemaerkninger over de nye eller mindre bekjendte Arter. Forhandlinger I Videnskabs-Selskabeti Christiania, 18, 1–124.
Serejo, C.S., Wakabara, Y. & Valrio-Berardo, M.T. (2000) Taxonomy and geography distribution of Ampelisca (Amphipoda : Gammaridea) from the Brazilian coast. Polskie Archiwum Hydrobiologii, 47 (3–4), 495–510.
Stimpson, W. (1864) Synopsis of the marine Invertebrata collected by the late Arctic Expedition, under Dr. J. J. Hayes. Proceedings of the Academy of Natural Sciences, Philadelphia,15, 138–142.
Watling, L. (1995) Chapter 3. The Families Ampeliscidae, Amphilochidae, Liljeborgiidae, and Pleustidae. In: Taxonomic Atlas of the Benthic Fauna of the Santa Maria Basin and Western Santa Barbara Channel. Volume 12, pp.
137–176. Special Publications of the Santa Barbara Museum of Natural History, Santa Barbara , California.