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Left-coiled specimen, umbilical view, scale bar 0.1 mm Collected: Aug. 1991, RV Dalnie Zelentsy, Franz Josef Land sounds, 150 mwd, modern deposits |
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Right-coiled (Dextral) specimen, umbilical view Collected: summer1992 U.S.G.S. cruise, Arctic continental slope off Alaska (Chukchi Borderland, 75º 44.65’N, 160º 55.73’ W), 2103mwd, modern hemipelagic mud |
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Left-coiled (sinistral) specimen, umbilical view Collected: summer1992 U.S.G.S. cruise, Arctic continental slope off Alaska (Chukchi Borderland, 75º 44.65’N, 160º 55.73’ W), 2103mwd, modern hemipelagic mud |
Remarks: | The most abundant planktonic foraminifer of high latitudes; as any planktonic foraminifer, avoids low-salinity and shallow waters. The left-coiled morphotype prevails at lowest temperatures and occurs throughout the Arctic Ocean. On the Barents-Kara shelf, tests of N.pachyderma are abundant mostly in sediments underlying Atlantic-derived waters, that is, in troughs 300-600 mwd extending from the continental margin to the shelf interior. |