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Encrusting Bryozoans from the Upper Cretaceous of the Middle Volga Region and Crimea

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Abstract

Bryozoans encrusting belemnite rostra from the Upper Cretaceous of the Middle Volga region (environs of Volsk and Shikhany) and Central Crimea (Mount Ak-Kaya) are studied. Since the colonies are poorly preserved, they lack many diagnostic features; therefore, most of the species are listed in open nomenclature. The bryozoans studied are from the Middle Volga region, mainly originate from the Santonian–Maastrichtian, and are represented by the species Cyclostomata gen. et sp. indet. (class Stenolaemata), Herpetopora cf. anglica Lang, Hillmeropora sp., ?Marginaria sp., Pyriporella sp., Tyloporella sp., Rhagasostoma gibbosulum Brydone, and Aechmellina cf. anglica (Brydone) (class Gymnolaemata, order Cheilostomata). Bryozoans from Ak-Kaya come from the Campanian to Maastrichtian and include the species Plagioecia sp. (order Cyclostomata), ?Electra sp., ?Conopeum sp., and Anornithopora sp. (order Cheilostomata). Data on cheilostome bryozoans from Ak-Kaya and on the Santonian–Campanian bryozoan assemblage from the Middle Volga region are presented for the first time. The studied species from both regions belong to genera that are widespread in the Upper Cretaceous of Eurasia and the United States.

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Funding

This study was performed under state assignment no. AAAA-A16-116033010096-8 (Moscow State University).

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Authors and Affiliations

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

    A. V. Koromyslova

  2. Moscow State University, 119991, Moscow, Russia

    E. Yu. Baraboshkin

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

    E. Yu. Baraboshkin

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  1. A. V. Koromyslova
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Translated by D. Zabolotny

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Koromyslova, A.V., Baraboshkin, E.Y. Encrusting Bryozoans from the Upper Cretaceous of the Middle Volga Region and Crimea. Paleontol. J. 56, 52–66 (2022). https://doi.org/10.1134/S0031030122010099

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