Abstract
The ostracod genera Camptocythere Triebel and Procytherura Whatley from the Lower and Middle Callovian of TETs-5 reference Section (Saratov Region) and Middle Callovian–Lower Oxfordian of Mikhailovtsement reference Section (Ryazan Region) have been studied. The genus Camptocythere is revised; genus Aparchitocythere Swain et Peterson is considered as a separate genus (rather than a subgenus of Camptocythere), whereas the genus Palaeoloxoconcha Dreyer is for the first time included as a subgenus. New species are described: C. (Camptocythere) quinta Tesakova, sp. nov., C. (Palaeoloxoconcha) caudata Tesakova, sp. nov. (with the subspecies C. (P.) caudata caudata Tesakova, subsp. nov. and C. (P.) caudata nuda Tesakova, subsp. nov.), C. (P.) ryazanica Tesakova, sp. nov. and Procytherura ippolitovi Tesakova, sp. nov. Within the East European Platform (EEP), two ostracod concurrent-range zones have been recognized. The A. milanovskyi–P. cinicinnusa Concurrent-range Zone is recognized in the Lower Callovian (Subpatruus ammonite Zone, Subpatruus–Saratovensis biohorizons) of Ukraine, Kursk Region, and Volga Region. The Pr. wartae–Pl. kurskensis Concurrent-range Zone is recognized in the Lower Callovian (Subpatruus ammonite Zone, Saratovensis Biohorizon)–Middle Callovian (Jason Zone) of Ukraine, Belarus, Central Chernozemye, Kursk Region, and Middle Volga Region. Based on the evolution of the subgenus C. (Palaeoloxoconcha), new lineage zones are proposed. The C. (P.) bathonica Lineage Zone is recognized in northwestern Europe in the Upper Bajocian–Bathonian. The C. (P.) caudata Lineage Zone is recognized on the EEP (Belarus, Kursk and Saratov regions) in the Lower Callovian (Subpatruus Zone, Saratovensis Biohorizon)–lower part of the Middle Callovian (Jason Zone). The C. (P.) ryazanica Lineage Zone is recognized in the Ryazan Region in the upper part of the Middle Callovian (Coronatum Zone)–Lower Oxfordian (Mariae Zone).
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ACKNOWLEDGMENTS
The authors are grateful to Ya.A. Shurupova (MSU) for washing the samples collected from the TETs-5 Section by Seltser and Tesakova in 2011, and R.A. Rakitov (PIN) for constant assistance with SEM photography. We are also deeply grateful to our reviewers L.M. Melnikova (PIN) and A.P. Ippolitov (GIN) for constructive comments contributing to the improvement of this article.
Funding
The work was carried out within the framework of the state task nos. 0135-2019-0062 (GIN) and AAAA-A16-116033010096-8 (MSU).
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Tesakova, E.M., Seltser, V.B. New Callovian–Lower Oxfordian Ostracods from the Russian Plate (Genera Camptocythere Triebel and Procytherura Whatley) and Their Stratigraphic Significance. Paleontol. J. 56, 526–547 (2022). https://doi.org/10.1134/S0031030122050124
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DOI: https://doi.org/10.1134/S0031030122050124