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Early Maastrichtian cheilostome bryozoans from the middle Volga River region

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Abstract

Eight species in six genera of cheilostome bryozoans are described from an early Maastrichtian outcrop located in the Saratov Region, middle Volga River region, southern Russia. The studied bryozoan assemblage includes a new species, Cheethamia volgaensis sp. nov., as well as Dionella sp., Cheethamia aktolagayensis Koromyslova et al., Rhagasostoma cf. saltans (Brydone), and Luganella goldfussi (von Hagenow). A few poorly preserved specimens are tentatively assigned to the genera Hoplitaechmella and Acoscinopleura. Some of the recorded species encrusted a Cataceramus shell and internal moulds of Baculites ammonoid shell fragments; whereas others produced erect, flattened, bifoliate colonies. A single species, L. goldfussi, had free-living, discoidal colonies. The palaeobiogeography of early Maastrichtian bryozoans is discussed. The recorded bryozoans belong to genera ubiquitous in the early Maastrichtian of Europe and, to a lesser degree, other regions.

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Acknowledgements

The authors thank N.I. Krupina (Earth Science Museum of the Moscow State University, Moscow, Russian Federation) for providing access to originals of some species described by E. Voigt (1962). Roman A. Rakitov (Borissiak Paleontological Institute of the Russian Academy of Science, Moscow, Russian Federation) is thanked for providing technical assistance with SEM work and for linguistic assistance. Emanuela Di Martino (University of Oslo, Norway), Paul D. Taylor (Natural History Museum, London, United Kingdom), and the editor-in-chief Mike Reich (Bayerische Staatssammlung für Paläontologie und Geologie, München) are thanked for their helpful reviews and comments on the manuscript. The reported study was funded by RFBR according to the research Project № 18-05-00245-A.

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  1. Borissiak Paleontological Institute of the Russian Academy of Science, Profsoyuznaya St. 123, Moscow, Russian Federation, 117647

    Anna V. Koromyslova

  2. Chernyshevsky Saratov State University, Astrakhanskaya St. 83, Saratov, Russian Federation, 410012

    Vladimir B. Seltser

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Correspondence to Anna V. Koromyslova.

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Koromyslova, A.V., Seltser, V.B. Early Maastrichtian cheilostome bryozoans from the middle Volga River region. PalZ 94, 697–714 (2020). https://doi.org/10.1007/s12542-019-00509-3

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