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Permian bryozoans from the Nemda horizon (Roadian) of Samara Region, Russia

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Abstract

Six bryozoan species are described from the Lower Roadian (Guadalupian) of the eastern part of the East European Platform. The studied fauna is abundant and represented by various growth habits (branching, massive, encrusting, reticulate), developed in local bioherms. The studied bryozoan assemblage consists of trepostomes (three species), fenestrates (two species) and one cryptostome species with specific exozonal skeletons. Trepostomes of genus Dyscritella are dominant in this bryozoan association and possess acanthostyles differentiated by size. These structures probably performed protective and fixing functions. Fenestrate bryozoans have funnel-shaped and reticulate colonies with superstructure, which could have developed to protect against rapid sedimentation and predators. The identified bryozoan species are widely distributed within the East European Platform, with some similarities to the Roadian fauna of Transcaucasia, Guadalupian fauna of the Primorskij Kraj and Omolon massif.

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Acknowledgements

The author is very grateful to A. Koromyslova (Borissiak Paleontological Institute of the Russian Academy of Sciences, Moscow) for providing samples, S. Moloshnikov (Moscow State University, Moscow) for information about localities and V. Silantiev (Kazan Federal University, Kazan) for providing relevant literature and consultations about Kazanian stratigraphy. A. Gorjchko (Kuban State University, Krasnodar) is thanked for scanning colonies in a scanning electron microscope. Many thanks go to P. N. Wyse Jackson (Trinity College, Dublin) for English corrections. H. N. Nakrem (Natural History Museum, Oslo) and A. Ernst (Institut für Geologie, Universität Hamburg, Hamburg) are gratefully thanked for useful comments that improved the content of the paper. The work was supported by the Russian Foundation for Basic Research (Project 18-05-00245-a), and was carried out according to the Russian Government Program of Competitive Growth of Kazan Federal University.

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  1. Kuban State University, Krasnodar, Russia

    Zoya Tolokonnikova

  2. Kazan Federal University, Kazan, Russia

    Zoya Tolokonnikova

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Correspondence to Zoya Tolokonnikova.

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Tolokonnikova, Z. Permian bryozoans from the Nemda horizon (Roadian) of Samara Region, Russia. PalZ 94, 79–92 (2020). https://doi.org/10.1007/s12542-018-00440-z

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