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Abstract <p>Numerous representatives of the family Echinocampidae Bragin, 2009 were discovered as a result of studying the Jurassic−Cretaceous radiolarians of Western Siberia and the Volga River Basin. A new genus <i>Spinicapsa</i> gen. nov., its type species <i>S. gatovskii</i> sp. nov., as well as a new species <i>Arctocapsula kalmikovi</i> sp. nov., are described from the carbonate-siliceous deposits of the upper Bazhenov Formation (Volgian–Ryazanian Regional Stages = Tithonian–Berriasian Stages) of Western Siberia. The diagnosis of the genus <i>Arctocapsula</i> Bragin 2009 is emended, <i>Arctocapsula aculeata</i> sp. nov. is described from the clay deposits of the <i>Subditus</i> Zone in the Volga River Basin.</p>

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A New Genus and New Species of Early Cretaceous Radiolarian of the Family Echinocampidae from Western Siberia and the Volga River Basin

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • V. S. Vishnevskaya

摘要

Abstract

Numerous representatives of the family Echinocampidae Bragin, 2009 were discovered as a result of studying the Jurassic−Cretaceous radiolarians of Western Siberia and the Volga River Basin. A new genus Spinicapsa gen. nov., its type species S. gatovskii sp. nov., as well as a new species Arctocapsula kalmikovi sp. nov., are described from the carbonate-siliceous deposits of the upper Bazhenov Formation (Volgian–Ryazanian Regional Stages = Tithonian–Berriasian Stages) of Western Siberia. The diagnosis of the genus Arctocapsula Bragin 2009 is emended, Arctocapsula aculeata sp. nov. is described from the clay deposits of the Subditus Zone in the Volga River Basin.