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On the First Record of Infragarantiana (Ammonoidea: Perisphinctidae) from the Upper Bajocian Niortense Zone (Middle Jurassic) of the Northern Caucasus, Russia

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Abstract

Infragarantiana primitiva (Wetzel) is recorded for the first time from the Upper Bajocian of Karachay-Cherkessia. The species “Garantiana” primitiva was previously known only from the holotype, originating from the lower part of the Niortense Zone of Germany, and is the type species of the monotypic genus Infragarantiana Westermann. New material from the Northern Caucasus makes it possible to clarify the diagnosis and systematic position of the genus Infragarantiana [M] (Perisphinctidae: Leptosphinctinae).

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Notes

  1. Here I must admit and correct my mistake in establishing the genus Keppleritiana. In recent collections, together with macroconch species originally assigned to this genus (including in their body chambers), microconchs Strenoceras Hyatt (S. ex gr. niortense (d’Orbigny) / bajocense (de Blainville), which are associated with the macroconchs Orthogarantiana Bentz. Therefore, the species “Keppleritiana” rostovtsevi Mitta and “K.” graebenschteini Mitta must belong to the genus Orthogarantiana, a senior subjective synonym of Keppleritiana Mitta.

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ACKNOWLEDGMENTS

The photographs were taken by S.V. Bagirov (Paleontological Institute of the Russian Academy of Sciences). S. Fernández-López (Madrid, Spain), G. Pavia (Asti, Italy), and V. Dietze (Nördlingen, Germany) assisted with publications on the topic. The author is sincerely grateful to everyone who contributed to the preparation of this work.

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  1. Borissiak Paleontological Institute, Russian Academy of Sciences, 117997, Moscow, Russia

    V. V. Mitta

  2. Cherepovets State University, 162600, Cherepovets, Russia

    V. V. Mitta

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Correspondence to V. V. Mitta.

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Translated by S. Nikolaeva

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Mitta, V.V. On the First Record of Infragarantiana (Ammonoidea: Perisphinctidae) from the Upper Bajocian Niortense Zone (Middle Jurassic) of the Northern Caucasus, Russia. Paleontol. J. 55, 618–624 (2021). https://doi.org/10.1134/S0031030121060095

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