Research demonstrates new genera and species of radiolarians, indicating biodiversity in ancient marine environments.
As a result of studying the Jurassic-Cretaceous radiolarians of Western Siberia and Volga Basin, numerous representatives of the family Echinocampidae Bragin, 2009 were discovered. A new genus Spinicapsa gen. nov., its type species S. gatovskii sp. nov., as well as a new species Arctocapsula kalmikovi sp. nov., have been described from the carbonate-siliceous deposits of the upper Bazhenov Formation (Volgian-Rjazanian Regional Stages = = Tithonian-Berriasian Stages) of Western Siberia. The diagnosis of the genus Arctocapsula Bragin 2009 was clarified, Arctocapsula aculeata sp. nov. described from the clay deposits of the Subditus zone in Volga River Basin.
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V. S. Vishnevskaya (2025) studied this question.
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