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A New Radiolarian Family Provisocyntridae fam. nov. from the Late Paleozoic

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Abstract

The genus Provisocyntra Nazarov et Ormiston, 1987 is revised and its diagnosis is emended. The features of the simultaneous centrifugal and tangential types of growth of the Provisocyntra test are analyzed. The presence of an internal framework in the form of a microsphere is confirmed. The species composition is expanded to include ten species from the Carboniferous–Middle Permian. Four new species of Early Tournaisian radiolarians from the Volga-Ural Basin are described: Provisocyntra grandis sp. nov., P. kononovae sp. nov., P. magniporosa sp. nov., and P. valminazae sp. nov. A new family Provisocyntridae fam. nov. is established. The diagnosis and composition of the order Spongiata Afanasieva et Amon, 2003 are emended.

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Notes

  1. “Emended diagnosis. The spherical shell consists of spongy tissue between numerous, closely as well as radially distributed spines. The internal spicule with a median bar is six-rayed; apophyses on each ray form a subrectangular R-frame” (Won, 1997, с. 383).

  2. Statistical analysis of the absolute and relative values of the parameters of the shells of Paleozoic radiolarians showed a stable pattern of variation in the size of the test, its parts, and their ratios. The presence of such stable ratios makes it possible to use in the description of species the terms “very large”, “large”, “small” or “very small”, which correspond to certain ranked quantitative values (Afanasieva, 2000).

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ACKNOWLEDGMENTS

The author expresses his sincere gratitude to: A.S. Alekseev and G.P. Nestell for fruitful discussion of the issues in this paper; 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 of radiolarians; A.F. Bannikov and Ya.M. Kuzmina for valuable advice and comments in preparing this article 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 to the Borissiak Paleontological Institute, Russian Academy of Sciences (PIN).

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  1. Borissiak Paleontological Institute, Russian Academy of Sciences, 117647, Moscow, Russia

    M. S. Afanasieva

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Correspondence to M. S. Afanasieva.

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Translated by S. Nikolaeva

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Afanasieva, M.S. A New Radiolarian Family Provisocyntridae fam. nov. from the Late Paleozoic. Paleontol. J. 56, 123–135 (2022). https://doi.org/10.1134/S0031030122020022

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