Sakmarian Gastropods from the Samarskaya Luka (Lower Permian, Volga-Urals)

• Published in: Paleontological journal 2020-12, Vol.54 (10), p.1152-1177
• Main Author: Mazaev, A. V.
• Format: Article
• Language: English
• Subjects: Earth and Environmental Science; Earth Sciences; Marine molluscs; New species; Paleontology; Permian
• ISSN: 0031-0301; 1555-6174
• DOI: 10.1134/S0031030120100056

For the first time, a Sakmarian gastropod assemblage from the Samarskaya Luka (Volga-Urals Region) is described. The assemblage includes 18 species: Apachella noinskyi sp. nov., Termihabena pinegensis, Worthenia morovi sp. nov., Baylea subpenea, Biarmeaspira verideclinata, Goniasma subangulata, Orthonema frequens, Stegocoelia samaraensis sp. nov., Arribazona tschernyschewi, Klavlia minuta sp. nov., Anomphalus murankaensis sp. nov., Microdoma kulogorae, Anematina permiana, Naticopsis sokensis sp. nov., Bulimorpha lavrskyi, Nemdaella usensis sp. nov., Donaldina sakmaraensis sp. nov., Streptacis volgenesis sp. nov. Of these, nine species are new. Five species are in common with a synchronous, previously described assemblage from Kulogory (Arkhangelsk Region). The Kulogory assemblage is shown to contain Baylea subpenea . The studied assemblage is unusual largely because of its invasive origin and short duration in an isolated basin. It is not known from where the described species had emigrated. At the same time, several species, Baylea subpenea, Goniasma subangulata , and Bulimorpha lavrskyi , and also some genera ( Nemdaella, Klavlia ) are in common with the gastropod assemblages of the Kazanian basin, which also come from isolated basins.