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Shell Microstructure of Septaliphoria excitata (Smirnova) (Rhynchonellida, Cyclothyrididae) from the Berriasian of the Russian Platform

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Abstract

The surface of the primary shell layer of Septaliphoria excitata (Smirnova, 1978) bears rhombic imprints of the epithelial cells that secrete the periostracum. The primary layer is pierced with micropores. The bundles of fibers of the secondary layer are directed at various angles, up to a right angle to the neighboring bundles.

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ACKNOWLEDGMENTS

The authors are sincerely grateful to G.T. Ushatinskaya (Paleontological Institute, Russian Academy of Sciences) for important comments made while the work was in progress.

Funding

This paper was supported by the Presidium of the Russian Academy of Sciences, program no. 17 “Evolution of the organic world. Role and impact of the planetary processes” (subprogram no. 1 “The development of life biosphere processes”), Russian Foundation for Basic Research, project no. 19-04-00324, and Ministry of Science and Higher Education (Russia).

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Authors and Affiliations

  1. Moscow State University, 119992, Moscow, Russia

    T. N. Smirnova

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

    E. A. Zhegallo

Authors
  1. T. N. Smirnova
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  2. E. A. Zhegallo
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Correspondence to T. N. Smirnova or E. A. Zhegallo.

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Translated by A. Madison

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Smirnova, T.N., Zhegallo, E.A. Shell Microstructure of Septaliphoria excitata (Smirnova) (Rhynchonellida, Cyclothyrididae) from the Berriasian of the Russian Platform. Paleontol. J. 55, 145–150 (2021). https://doi.org/10.1134/S0031030121020143

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  • DOI: https://doi.org/10.1134/S0031030121020143

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