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A new representative of a stylonuroid eurypterid from the Upper Devonian of the Kursk region, Russia

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Abstract

The paper deals with the description of a new species Soligorskopterus shpinevi, which was found in Upper Devonian deposits cropped out in the Mikhailovsky quarry (the City of Zheleznogorsk, Kursk region, Russia). The new species is based on the single although practically complete specimen visible from its abdominal side. The new species is characterized by following features: (1) widest part of the body is disposed in area of second/third sternites, the L/W ratio of prosoma is about 0.7; (2) compound eyes are crescentic, with rounded ends; (3) the ocelli are small, of ovoid shape, orientated along the prosoma, diverge towards anterior direction; (4) the ocellar area anteriory two-lobed, heart-like; (5) the metastoma of prolonged shape, with parallel lateral margins, straight posterior margin and round anterior margin; (6) the length of sternites is more or less equal; (7) the basal part of the telson is broad subtriangular. The upper Devonian deposits of the studied area show a distinctly regressive trend, which ended in complete change of the shallow water lagoon deposits by interruption of sedimentation up to the Jurassic time. This trend corresponds well to the “terrestrialisation” of the late Devonian environments, which could be also reflected in developing of “walking” of some of the Devonian eurypterids in contrast to less evolutionary advanced representatives of this group.

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Acknowledgements

The authors express their sincere gratitude to Prof. E.Ju. Baraboshkin for his help in the field work. This work was funded by the subsidy of the Russian Government to support the Program of Competitive Growth of Kazan Federal University among World’s Leading Academic Centers and the State Program no 0135-2016-0001 of the Geological Institute of Russian Academy of Sciences. The authors are grateful to late Dr. T.S. Shpinev (the State Museum named after K.A. Timirjazev, Moscow), who encouraged us to prepare the description of the eurypterid remains from the collection in hand. The reviewers Michael B. Cuggy (University of Toronto, Canada), Joachim T. Haug (Ludwig-Maximilians-Universität, München) and one anonymous reviewer are gratefully acknowledged for their valuable recommendations, which allowed to improve the initial version of the manuscript. The authors are thankful to the editor-in-chief Mike Reich (Bayerische Staatssammlung für Paläontologie und Geologie, München) for constructive and very helpful advice in preparing the article for publication. Special thanks are due to Dr. O.A. Cook for her valuable linguistic improvement of the manuscript, and to the geological team of the Metalinvest Company for kindly provided access to the Devonian sequences of the Mikhailovsky Rudnik quarry (the City of Zheleznogorsk, Kursk region, Russia).

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Authors and Affiliations

  1. Geological Institute of Russian Academy of Sciences, Pyzhevsky per., 7, 119017, Moscow, Russia

    Serge V. Naugolnykh

  2. Kazan Federal University, Republic of Tatarstan, Russia

    Serge V. Naugolnykh

  3. Russian State Agrarian University named after K.A. Timirjazev, Timirjazevskaya str., 49, 127550, Moscow, Russia

    Alexander V. Areshin

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  1. Serge V. Naugolnykh
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Correspondence to Serge V. Naugolnykh.

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Handling Editor: Joachim T. Haug.

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Naugolnykh, S.V., Areshin, A.V. A new representative of a stylonuroid eurypterid from the Upper Devonian of the Kursk region, Russia. PalZ 94, 439–447 (2020). https://doi.org/10.1007/s12542-019-00501-x

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