Abstract—
The ecology and taxonomy of Islandiella norcrossi (Cushman, 1933), a typical representative of the Arctic calcareous benthic foraminifers, are analyzed based on microfossils from the Late Pleistocene-Holocene deposits of the Laptev Sea. This species is distributed on the shelf and continental slope of the Arctic seas, and indicates normal marine conditions with a seasonal ice cover and cold Arctic water masses. The species is also associated with a high seasonal productivity in sea-ice marginal zone. Tests are abundant in the Laptev Sea sediments, and show some variability in the size and shape of chambers, which was possibly caused by harsh environmental conditions of the Arctic (limited period of growth and reproduction); aberrant forms with an additional aperture being also present. The population contains tests of macrospherical and microspherical generations, as well as juveniles.
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ACKNOWLEDGMENTS
We are grateful to H. Kassens and H.A. Bauch for passing us the material for study. We thank colleagues from the Center of Instrumental Analytics of the Borissiak Paleontological Institute of the Russian Academy of Sciences (PIN), Center of Optical Microscopy of the Geological Institute of the Russian Academy of Sciences (GIN), Otto Schmidt Laboratory of the Arctic and Antarctic Research Institute (AANII) for the help with photography of specimens. We also thank A.S. Alekseev and S.A. Korsun for consultations and advice on paleontological descriptions.
Ya.S. Ovsepyan acknowledges financial support of the State Contract to the Geological Institute (GIN) no. 0135-2019-0057, E.E. Taldenkova acknowledges financial support of the Ministry of Science and Higher Education of the Russian Federation, project no. RFMEFI61617X0076 “Changing Arctic Transpolar System.”
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Ovsepyan, Y.S., Taldenkova, E.E. Distribution Patterns and Morphology of Islandiella norcrossi (Cushman) in the Upper Quaternary Deposits of the Laptev Sea. Paleontol. J. 53, 10–19 (2019). https://doi.org/10.1134/S0031030119010064
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DOI: https://doi.org/10.1134/S0031030119010064