Abstract
Features and major distinctions in the appearance and distribution of radiolarians with two porous spheres and one main spine in the Devonian basins are considered. Four solitary population waves and expansion scenario of radiolarians of this morphotype have been recognized in the Devonian. A new species, Radiobisphaera rozanovi sp. nov., from the Upper Emsian, Upper Eifelian, and Middle Frasnian of the southern Ural Mountains, from the Upper Eifelian of the Prague Basin (Barrandian), from the Middle-Upper Frasnian of the Rudnyi Altai, and from the Lower Famennian of the Timan-Pechora Basin and the Polar Ural Mountains is described.
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