Abstract
An extended and updated redescription of the stratigraphically important species Glyptocythere aspera (Khabarova, 1955) from the Upper Bajocian–Lower Bathonian of the Russian Plate (RP), Western Kazakhstan and Uzbekistan was made as a result of a revision, and a neotype was designated. The species G. bathonica from the Lower Bathonian of the RP and Western Kazakhstan was described as new. The lineage G. tuberodentina Brand et Malz in Brand et Fahrion (bj2, Parkinsoni ammonite Zone) → G. aspera (bj2-bt1, Michalskii ammonite Zone and lower part of the Besnosovi ammonite Zone) → G. bathonica sp. nov. (bt1, upper part of the Besnosovi Zone) has been reconstructed on the RP, which developed by paedomorphosis, with the advancing evolution of males. Species characters (shell outline, linear parameters, hinge, and sculpture) evolved in females and males at different rates, in males with retardation, which led to the convergence of the shells of both sexes in G. bathonica sp. nov. That is, the lineage evolved with a weakening of sexual dimorphism. The species G. tuberodentina appeared and developed in northern Germany in the Late Bajocian (Parkinsoni Phase) and at the same time migrated across the Polish Sea to the seas of RP. The north German G. tuberodentina taxon-range Zone (b2, Parkinsoni Zone, the upper part of the Truellei Subzone and the Bomfordi Subzone) was traced for the first time in Poland and the Dnieper–Donets Depression (DDD). In the DDD, its range was reduced due to the recognition of a new ostracod lineage-zone in the Michalskii Zone. Based on the reconstructed lineage, the following new ostracod lineage-zones were established: G. tuberodentina Zone (b2, Parkinsoni Zone) for the DDD, G. aspera Zone (bj2-bt1, the zones Michalskii and Besnosovi with the O. mojarowskii and O. sciticum biohorizons) for the DDD, Central Russia, the Volga Region, and Western Kazakhstan, and G. bathonica Zone (bt1, Besnosovi Zone, O. issae–A. excentricum biohorizons) for Central Russia, the Volga Region, and Western Kazakhstan.
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Notes
The species G. tuberodentina appeared in northwestern Europe only in the second half of the Parkinsoni Phase, so it could not have appeared in Ukraine earlier. Representatives of this species, illustrated in the Atlas of Jurassic ostracods of Ukraine (Pyatkova and Permjakova, 1978, p. 142, pl. 58, fig. 3), come into stratigraphic conflict with the attribution of host rocks to the Garantiana ammonite Zone.
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ACKNOWLEDGMENTS
The author is very grateful to N.N. Kolpenskaya (Geologorazvedka, St. Petersburg), Ya.A. Shurupova (MSU), L.A. Glinskikh (IPGG SB RAS), A.P. Ippolitov (GIN RAS), A.S. Alekseev (MSU), A.V. Chereshinsky (VSU), R.A. Voinova (MSU), V.B. Seltser (SNIGU) and A.V. Ivanov (IG RAS) for various 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 A.P. Ippolitov (GIN RAS) for comments on the paper, which helped to improve it.
Funding
The work was carried out within the framework of the state task no.no. 0135-2019-0062 (GIN RAS) and AAAA-A16-116033010096-8 (MSU).
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Tesakova, E.M. Late Bajocian and Early Bathonian Ostracods of the Russian Plate. Part IV. The Lineage Glyptocythere aspera (Khabarova) → G. bathonica sp. nov.. Paleontol. J. 56, 646–662 (2022). https://doi.org/10.1134/S0031030122060120
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DOI: https://doi.org/10.1134/S0031030122060120