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New Late Jurassic Saturnalidae (Radiolaria) of the Arctic and Pacific Margins (Russia)

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Abstract—

Numerous radiolarians of the family Saturnalidae have been identified in the Yamal Peninsula (South Tambey Region) at the depth interval of 3352.4–3354.6 m in the Lower Volgian cherty limestones. Saturnalids are found for the first time in the Jurassic of the Arctic margin of Siberia; they were previously known from the Jurassic only in the Pacific margin of Russia. Jurassic radiolarians from saturnalids are systematically described. These include one new genus Acanthocircularis gen. nov. with five new species A. arcticus sp. nov., A. polaris sp. nov., A. sibiricus sp. nov., A. solis sp. nov., A. yamalensis sp. nov., four new species of the genus Spongosaturninus (S. cornutus sp. nov., S. cristatus sp. nov., S. trispinus sp. nov. and S. volgensis sp. nov.), and one new species of Eospongosaturninus (E. ovalis sp. nov.). The diagnoses of two radiolarian species have been supplemented: Spongosaturninus bispinus Yao, 1972, emend. nov. and S. meyerhofforum (Hull, 1997), emend. nov.

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ACKNOWLEDGMENTS

The author expresses her deep gratitude to A.S. Alekseev (Moscow State University), M.S. Afanasieva (Borissiak Paleontological Institute, Russian Academy of Sciences) and N.Yu. Bragin (Geological Institute, Russian Academy of Sciences) for valuable advice and comments that contributed to the improvement of the paper, to Yu.A. Gatovsky (Moscow State University) for providing materials on Borehole 170, E.A. Zhegallo (Borissiak Paleontological Institute, Russian Academy of Sciences) for high-quality SEM photographs of radiolarians.

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The work was carried out in accordance with a state assignment to Geological Institute, Russian Academy of Sciences (no. 0114-2021-0003).

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  1. Geological Institute, Russian Academy of Sciences, 119017, Moscow, Russia

    V. S. Vishnevskaya

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  1. V. S. Vishnevskaya
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Correspondence to V. S. Vishnevskaya.

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Translated by S. Nikolaeva

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Vishnevskaya, V.S. New Late Jurassic Saturnalidae (Radiolaria) of the Arctic and Pacific Margins (Russia). Paleontol. J. 55, 1511–1524 (2021). https://doi.org/10.1134/S0031030121120078

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