Abstract
The northernmost representative of the genus Gregoryceras, G. boreale Mitta et Stupachenko, sp. nov., is described based on a holotype from the Mikhalenino section on the Unzha River (Kostroma Region). The new species comes from the lower part of the Tenuiserratum Zone (Zenaidae subzone), comparable to the tops of the Plicatilis Zone (Arkelli Subzone) of the Middle Oxfordian sub-Mediterranean scales.
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Notes
Amoeboceras alternoides as the index species of the zone has priority over A. glosense: see Mesezhnikov et al. (1989, p. 39).
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ACKNOWLEDGMENTS
We are sincerely grateful to Sergei Bagirov (Paleontological Institute, Russian Academy of Sciences) for the photography of the holotype of the new species and Prof. Raymond Enay (Lyon, France) for helpful discussions. We are sincerely grateful to two anonymous reviewers, who provided some useful suggestions.
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Mitta, V.V., Stupachenko, A.V. The First Record of Gregoryceras (Ammonoidea, Aspidoceratidae) in the Middle Oxfordian of the Northern Part of Central Russia (Unzha River). Paleontol. J. 54, 14–19 (2020). https://doi.org/10.1134/S0031030120010062
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DOI: https://doi.org/10.1134/S0031030120010062