Abstract

A new species Camptocythere (Anabarocythere) triangula Tesakova, sp. nov. is described from the Upper Bajocian (Michalskii ammonite Zone) and the Lower Bathonian (Besnosovi ammonite Zone) of the Russian Plate (Sokur Borehole, Saratov Region). This species is presumed to be the ancestor of C. (A.) muricata Gerke et Lev, sp. nov. from the upper Bathonian–Callovian of northern Siberia, Timan-Pechora Province and the Barents Sea shelf, the first description of which is also published in this paper. The publication of the original description by O.M. Lev, expanded and supplemented by the author of this study, confers availability and validity of this species from the date of the present publication, and eliminated shortcomings in the stratigraphic literature, where until now C. (A.) muricata was a nomen nudum. The possible phylogenetic relationship between these species allows them to be considered indices of the corresponding lineage zones in the scale of evolution of the subgenus C. (Anabarocythere) Nikitenko. The species Procytheridea? bajociensis (Khabarova, 1955) is re-studied from the same deposits of the Sokur Borehole and the Lower Bathonian of the Obval Borehole (Penza Region). P. concinna Permjakova, 1974 and P. ljubimovae Permjakova, 1974 from the synchronous deposits in Ukraine were synonymized with this species after its revision. A neotype is designated for P.? bajociensis and an expanded and supplemented redescription is provided. The monospecific assemblages (or with the dominance of this taxon) with P.? bajociensis, are restricted to the Late Bajocian–Early Bathonian of the Russian Plate and Western Kazakhstan and suggest an extremely shallow coastal setting, possibly with unstable salinity.

中文翻译：

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俄罗斯板块的晚巴约纪和早期巴通纪介形类动物。第三部分。属 Camptocythere Triebel 和 Procytheridea Peterson

摘要

一个新种Camptocythere ( Anabarocythere ) triangula Tesakova, sp. 十一月 描述于俄罗斯板块（Sokur Borehole，Saratov Region）的上 Bajocian（ Michalskii菊石带）和下 Bathonian（Besnosovi 菊石带）。该物种被推测为C的祖先。( A .) muricata格克等列夫，SP。十一月 来自西伯利亚北部、蒂曼-伯朝拉省和巴伦支海陆架的上巴通尼亚-卡洛维安，第一次描述也发表在本文中。OM Lev 发表的原始描述，由本研究的作者扩展和补充，从本出版物之日起赋予该物种的可用性和有效性，并消除了地层文献中的缺陷，直到现在C. ( A .) muricata是一个 nomen nudum。这些物种之间可能的系统发育关系使它们可以被视为C亚属进化规模中相应谱系区域的指标。( Anabarocythere) 尼基坚科。Procytheridea物种? bajociensis (Khabarova, 1955) 是从 Sokur Borehole 和 Obval Borehole (Penza Region) 的 Lower Bathonian 的相同沉积物中重新研究的。P. concinna Permjakova，1974 年和P. ljubimovae Permjakova, 1974 来自乌克兰的同步沉积物，在其修订后与该物种同义。为P指定了一个新类型。？bajociensis并提供了扩展和补充的重新描述。与P.的单种组合（或具有该分类群的优势）。巴乔金斯，仅限于俄罗斯板块和哈萨克斯坦西部的巴约西亚晚期-巴通早期早期，表明沿海环境极浅，盐度可能不稳定。