What question did this study set out to answer?

This research aims to trace the migration pathways of the Glyptocythere genus and understand their evolutionary development in the East European Platform.

May 9, 2026

The Genus Glyptocythere Brand et Malz, 1962 (Ostracoda) in the Late Bajocian and Early Bathonian of the East European Platform. Part 1: Systematics and Paleogeography

Key Points

This research aims to trace the migration pathways of the Glyptocythere genus and understand their evolutionary development in the East European Platform.
Analyzed stratigraphic ranges of specific Glyptocythere species across several zones in the East European Platform.
Identified and described migratory corridors and associated species through paleogeographic mapping.
Examined the taxonomic classification and evolution of Glyptocythere lineages based on historical data.
Established the stratigraphic range of six Glyptocythere species within the Parkinsoni Zone of Ukraine.
Identified the G. aspera Zone as a key index for species tracking in the Dnieper–Donets Basin and surrounding regions.
Documented four parallel evolutionary lineages of Glyptocythere evolving in the East European Platform during the late Bajocian to early Bathonian.

Abstract

The migration pathways of Western European Glyptocythere Brand et Malz, 1962 during the Bajocian–Bathonian and their expansion into the seas of the East European Platform (EEP) through the northern migration corridor (Pripyat Trough), with the formation of allopatric neoendemic species, are traced. The precise stratigraphic range of the Ukrainian species G. losoviensis Permyakova, 1970, G. aff. tuberosa (Khabarova, 1955) (= G. regulariformis Brand et Malz in Brand and Fahrion, 1962 sensu Permyakova, 1978), G. aff. tuscila Brand et Malz, 1966, G. aff. tenuisulcata Brand et Malz in Brand and Fahrion, 1962, G. crassicostata Permyakova, 1970, and G. multa Permyakova, 1970 is established at the end of the Parkinsoni Zone, in the boundary interval of the Truellei (Densicosta) and Bomfordi subzones. These species can be considered characteristic of the G. tuberodentina ostracod Zone, which is recognized in Ukraine. The species G. aspera (Khabarova, 1955), G. tuberosa (Khabarova, 1955), G. praerimosa (Khabarova, 1955), and G. strigata (Khabarova, 1955) are distributed in the Michalskii Zone and serve as index species for the G. aspera ostracod Zone, which has also been traced in the Dnieper–Donets Basin. The G. aspera Zone is widely recognized in the south of Central Russia (Kursk and Belgorod regions), the Volga Region, and western Kazakhstan. In the Lower Volga Region, it corresponds to the Michalskii Zone and the lower part of the Besnosovi Zone (including the O. issae biohorizon). The upper part of the Besnosovi Zone (the O. calvum and O. besnosovi biohorizons) is characterized by a different assemblage of Glyptocythere that evolved in the Central Russian Sea: G. bathonica Tesakova, 2022, G. khabarovae Tesakova, sp. nov., G. scissa Tesakova, sp. nov., G. transversa Tesakova, sp. nov., and G. kiklica Tesakova, sp. nov. During the late Bajocian–early Bathonian, the genus Glyptocythere evolved in the EEP through four parallel lineages. The systematics and evolution of two of these lineages (reticulate and some ribbed Glyptocythere) have been published previously. This article examines the taxonomy and development of two other lineages of ribbed Glyptocythere.

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Cite This Study

Е. М. Тесакова (Thu,) studied this question.

synapsesocial.com/papers/69fecfcdb9154b0b82876c1e https://doi.org/https://doi.org/10.1134/s086959382670005x

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