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Late Bajocian and Early Bathonian Ostracods of the Russian Plate. Part III. Genera Camptocythere Triebel and Procytheridea Peterson

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Abstract

A new species Camptocythere (Anabarocythere) triangula Tesakova, sp. nov. is described from the Upper Bajocian (Michalskii ammonite Zone) and the Lower Bathonian (Besnosovi ammonite Zone) of the Russian Plate (Sokur Borehole, Saratov Region). This species is presumed to be the ancestor of C. (A.) muricata Gerke et Lev, sp. nov. from the upper Bathonian–Callovian of northern Siberia, Timan-Pechora Province and the Barents Sea shelf, the first description of which is also published in this paper. The publication of the original description by O.M. Lev, expanded and supplemented by the author of this study, confers availability and validity of this species from the date of the present publication, and eliminated shortcomings in the stratigraphic literature, where until now C. (A.) muricata was a nomen nudum. The possible phylogenetic relationship between these species allows them to be considered indices of the corresponding lineage zones in the scale of evolution of the subgenus C. (Anabarocythere) Nikitenko. The species Procytheridea? bajociensis (Khabarova, 1955) is re-studied from the same deposits of the Sokur Borehole and the Lower Bathonian of the Obval Borehole (Penza Region). P. concinna Permjakova, 1974 and P. ljubimovae Permjakova, 1974 from the synchronous deposits in Ukraine were synonymized with this species after its revision. A neotype is designated for P.? bajociensis and an expanded and supplemented redescription is provided. The monospecific assemblages (or with the dominance of this taxon) with P.? bajociensis, are restricted to the Late Bajocian–Early Bathonian of the Russian Plate and Western Kazakhstan and suggest an extremely shallow coastal setting, possibly with unstable salinity.

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Notes

  1. It is strange that the three listed Camptocythere species were assigned to the nominative subgenus, since all of them show clear features of the subgenus C. (Anabarocythere) Nikitenko, 1994. Judging by the poor-quality images of C. (C.) micra (Nikitenko, 2009, pl. o-5, figs. 2–5), there were tubercles in the posterior part on both valves, as in C. (A.) triangula sp. nov., while C. (C.) muricata and C. (C.) laciniosa have well-developed spines. In this paragraph of the introduction, the taxonomy of B.L. Nikitenko is followed, but below in the main text these species are transferred by the present author to the subgenus Anabarocythere.

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ACKNOWLEDGMENTS

I am very grateful to N.A. Kolpenskaya (Geologorazvedka, St. Petersburg), Ya.A. Shurupova (MSU), L.A. Glinskikh (IPGG SB RAS), A.S. Alekseev (MSU), A.V. Chereshinsky (VSU), R.A. Voinova (MSU), V.B. Seltser (SNIGU) and A.V. Ivanov (IG RAS) for assistance in collecting and processing the material that formed the basis of this study (Tesakova, 2022a, 2022b). Special thanks to my reviewers L.M. Melnikova (PIN RAS) and Yu.N. Savelieva (VNIGNI) for remarks on the text of the article and N.V. Kupriyanova (VNIIOkeangeologiya) for discussing the history of the study and storage of the collections A.A. Gerke and O.M. Lev, including the holotypes.

Funding

The work was carried out within the framework of the state order nos. 0135-2019-0062 (GIN RAS) and AAAA-A16-116033010096-8 (MSU).

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  1. Moscow State University, 119991, Moscow, Russia

    E. M. Tesakova

  2. Geological Institute, Russian Academy of Sciences, 119017, Moscow, Russia

    E. M. Tesakova

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Translated by S. Nikolaeva

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Tesakova, E.M. Late Bajocian and Early Bathonian Ostracods of the Russian Plate. Part III. Genera Camptocythere Triebel and Procytheridea Peterson. Paleontol. J. 56, 400–411 (2022). https://doi.org/10.1134/S003103012204013X

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