Abstract—
Based on the revision of the radiolarian species Williriedellum salymicum Kozlova, 1983 (Nassellaria, fam. Williriedellidae Dumitrica, 1970), new description of this species was made. Since the holotype of this species is petrographic thin section with incomplete set of characters, we suggest to address the International Commission on Zoological Nomenclature a proposal to distinguish the neotype. The distribution interval of Williriedellum salymicum Kozlova, 1983 is limited by the Berriasian deposits of the North Russia. The SEM and X-ray microtomographic 3D-images of this species from Zone Parvicingula khabakovi–Williriedellum salymicum of the Bazhenov Formation from the Gubkinskaya 651 and Aprelskaya 11 boreholes, correspondingly, are given in this work for the first time.
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ACKNOWLEDGMENTS
We are grateful to G.A. Kalmykov (Moscow State University) for providing us with rock samples from the borehole Gubkinskaya 651 (Western Siberia), to Yu.A. Gatovskii and V.A. Kozlova (MSU) for extracting radiolarians using acetate acid and taking SEM micrographs, to N.S. Balushkina, I.V. Panchenko, D.V. Korost, A.N. Khomyak, and D.R. Gilyazetdinova (MSU) for assistance in application of X-ray microtomography for studying radiolarian skeletons, to A.S. Alekseev (MSU), E.O. Amon and P.Yu. Parkhaev (Paleontological Institute, Russian Academy of Sciences, Moscow) for valuable critical remarks.
Funding
This work was performed within the State Task of Geological Institute of Russian Academy of Sciences (projects nos. 0135-2016-0034 and 0135-2019-0057) and was partially supported by the Russian Foundation for Basic Research (project no. 18-05-00494a).
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Vishnevskaya, V.S. Revision of the Early Cretaceous Radiolarian Species Williriedellum salymicum Kozlova. Paleontol. J. 53, 334–340 (2019). https://doi.org/10.1134/S0031030119040142
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DOI: https://doi.org/10.1134/S0031030119040142