Abstract

Bryozoans encrusting belemnite rostra from the Upper Cretaceous of the Middle Volga region (environs of Volsk and Shikhany) and Central Crimea (Mount Ak-Kaya) are studied. Since the colonies are poorly preserved, they lack many diagnostic features; therefore, most of the species are listed in open nomenclature. The bryozoans studied are from the Middle Volga region, mainly originate from the Santonian–Maastrichtian, and are represented by the species Cyclostomata gen. et sp. indet. (class Stenolaemata), Herpetopora cf. anglica Lang, Hillmeropora sp., ?Marginaria sp., Pyriporella sp., Tyloporella sp., Rhagasostoma gibbosulum Brydone, and Aechmellina cf. anglica (Brydone) (class Gymnolaemata, order Cheilostomata). Bryozoans from Ak-Kaya come from the Campanian to Maastrichtian and include the species Plagioecia sp. (order Cyclostomata), ?Electra sp., ?Conopeum sp., and Anornithopora sp. (order Cheilostomata). Data on cheilostome bryozoans from Ak-Kaya and on the Santonian–Campanian bryozoan assemblage from the Middle Volga region are presented for the first time. The studied species from both regions belong to genera that are widespread in the Upper Cretaceous of Eurasia and the United States.

中文翻译：

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中伏尔加河地区和克里米亚上白垩统的结壳苔藓虫

摘要

研究了来自伏尔加河中部地区（沃尔斯克和希哈尼周边）和克里米亚中部（阿克卡亚山）上白垩统钙钛矿表层的苔藓虫。由于菌落保存不善，它们缺乏许多诊断特征；因此，大多数物种都以开放命名法列出。所研究的苔藓虫来自伏尔加河中部地区，主要起源于桑托尼亚-马斯特里赫特，以环口虫属为代表。等人。索引。（Stenolaemata 类），Herpetopora cf。anglica Lang, Hillmeropora sp., ? Marginaria sp.、Pyriporella sp.、Tyloporella sp.、Rhagasostoma gibbosulum Brydone 和Aechmellina cf。anglica (Brydone) (Gymnolaemata 类，Cheilostomata 目)。来自 Ak-Kaya 的苔藓虫来自 Campanian 到 Maastrichtian，包括Plagioecia sp。（环口目），？Electra sp., ? Conopeum sp. 和Anornithopora sp. （为了 Cheilostomata）。首次展示了来自 Ak-Kaya 的裂口苔藓虫和来自中伏尔加地区的 Santonian-Campanian 苔藓虫组合的数据。来自这两个地区的研究物种属于广泛存在于欧亚大陆上白垩纪和美国的属。