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TWO NEW CARIDEAN SHRIMPS (BRESILIIDAE) FROM A HYDROTHERMAL FIELD ON THE MID-ATLANTIC RIDGE

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ABSTRACT Rimicaris, a new genus, and two new species of caridean shrimps, R. exoculata and R. chacei, are recorded in swarms from a thermally influenced site in the rift valley of the Mid-Atlantic Ridge at 26°08.3'N, 44°49.6'W, 3,620-3,650 m depth. The shrimps appear to be the predominant macroinvertebrates in heated waters (at least 1.0°C above ambient, 2.37°C away from vents) on black sediments and layered rocks with the appearance of polymetallic sulfides precipitated from black smoker-type vents. Characters of these species indicate placement in the family Bresiliidae which is distributed in surface to mid-ocean depths. A key to the 7 bresiliid genera is given.

1. Delaney, J. R., R. E. McDuff, and J. E. Lupton. 1984. Hydrothermal fluid temperatures of 400°C on the Endeavour Segment, northern Juan de Fuca.―Eos, Transactions, American Geophysical Union 65: 973.
2. Kensley, B. 1983. New records of bresiliid shrimp from Australia, South Africa, Caribbean, and Gulf of Mexico (Decapoda: Natantia: Caridea).―Smithsonian Contributions to Zoology, 394: i-iii, 1-31.
3. Rona, P. A. 1985. Black smokers and massive sulfides at the TAG Hydrothermal Field, Mid-Atlantic Ridge 26°N.―Eos, Transactions, American Geophysical Union 66: 936.
4. ———, G. Klinkhammer, T. A. Nelsen, J. H. Trefry, and H. Elderfield. (In press.) Black smokers, massive sulfides and vent biota at the Mid-Atlantic Ridge.―Nature.
5. Williams, A. B., and F. A. Chace, Jr. 1982. A new caridean shrimp of the family Bresiliidae from thermal vents of the Galapagos Rift.―Journal of Crustacean Biology 2: 136-147.
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/content/journals/10.1163/193724086x00299
1986-01-01
2015-07-03

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