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Craspeditidae (Ammonoidea) of the Russian Platform at the Jurassic–Cretaceous Boundary. I. Genus Praesurites Mesezhnikov et Alekseev

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Abstract

The type species of the genus Praesurites,P. elegans Mesezhnikov et Alekseev, was described from the basal Berriasian of the Subpolar Urals (Sosva River basin). Finds of species of this genus in other regions are of importance for the interregional correlation of the Jurassic–Cretaceous boundary interval. The taxonomic composition and stratigraphic distribution of the Central Russian species of the genus Praesurites from the Volgian–Ryazanian boundary interval (the top of Craspedites nodiger Zone–Riasanites rjasanensis Zone) are revised. The revised diagnosis of the genus Praesurites and redescriptions of P. tryptychus (Nikitin), P. unshensis (Nikitin) (including P. nikitini Gerasimov et Mitta, as a junior subjective synonym) and P. craspeditoides (Girmounski) are presented.

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Notes

  1. This segment covers the right bank of the Unzha River (upstream) between the villages of Kozlovo, Ivanovo, Ogarkovo, Efimovo, Voloshnovo, Mikushino and Korshunskoe (now Sokornovo). Nikitin notes that the best outcrops, past and present, are exposed between the villages of Efimovo and Ogarkovo.

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ACKNOWLEDGMENTS

In the past two decades A.V. Stupachenko (Moscow), O. Hagel (Radeberg, Germany), V. Pirkl (Gerlingen, Germany), and S. Grebenstein (Bodelshausen, Germany) actively participated in collecting the materials, especially in the Unzha River. In addition, Stupachenko provided us with part of his collections to be studied. I.A. Satarodubtseva (SGM), N.M. Kadlets (TSNIGR Museum), E.A. Belyaeva, and E.L. Kotova (GM SPSU) have assisted in the study of the original specimens, described in works of S.N. Nikitin, A.M. Girmounsky, and P.A. Gerasimov.

Images of ammonites were provided by S.V. Bagirov (PIN RAS). The author is deeply grateful to everyone who contributed to the preparation of this publication.

Funding

This work was partially supported by the Program of Presidium of Russian Academy of Sciences no. 17 “Evolution of the Organic World and Planetary Processes.”

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Authors and Affiliations

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

    V. V. Mitta

  2. Cherepovets State University, 162600, Cherepovets, Russia

    V. V. Mitta

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  1. V. V. Mitta
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Correspondence to V. V. Mitta.

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Translated by D. Voroshchuk

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Mitta, V.V. Craspeditidae (Ammonoidea) of the Russian Platform at the Jurassic–Cretaceous Boundary. I. Genus Praesurites Mesezhnikov et Alekseev. Paleontol. J. 53, 471–481 (2019). https://doi.org/10.1134/S0031030119050101

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