Abstract
The new radiolarian genus Nestelliana gen. nov. and two new species: N. glomerosa sp. nov. and N. grassiclatrata sp. nov. are described from the deposits of the Lower Tournaisian (Lower Carboniferous) of the Volga-Ural Basin and the Lower Famennian (Upper Devonian) of the Polar Urals of Russia.
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Notes
“A six- to eight-rayed double spicule, from the rays of which arise straight spinules that branch and anastomose. The spinules arise at various distances along each ray, their branches are few and straight or only slightly curved, and the resultant meshwork is very loose and formed of few angular meshes” (Foreman, 1963, с. 281).
Statistical analysis of the absolute and relative values of the parameters of the tests of Paleozoic radiolarians showed a stable pattern of changes in the size of the skeleton, its parts, and their ratios (Fig. 4). The presence of such stable ratios makes it possible to formalize the process of data classification and to operate in the description of species with the concepts of “very large”, “large”, “small” or “very small”, which correspond to certain quantitative values (Afanasieva, 2000).
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ACKNOWLDEGMENTS
The author expresses his sincere gratitude to A.S. Alekseev, G.P. Nestell and V.S. Vishnevskaya for valuable advice and constructive recommendations; L.I. Kononova for advice on the age of the host rocks; L.I. Kononova and V.M. Nazarova for providing material on radiolarians; A.F. Bannikov, Ya.M. Kuzmina, M.A. Knorre, and A.V. Koromyslova for valuable advice and comments in preparing this paper for publication and to S.V. Nikolaeva for translating this paper into English.
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The work was carried out within the framework of the state assignment of the PIN RAS.
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Afanasieva, M.S. A New Radiolarian Genus Nestelliana gen. nov. and New Species from the Late Devonian of the Polar Urals and the Early Carboniferous of the Volga–Ural Basin of Russia. Paleontol. J. 56, 17–23 (2022). https://doi.org/10.1134/S0031030122010026
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DOI: https://doi.org/10.1134/S0031030122010026