Abstract The first find of a Late Cretaceous shark tooth, or of any cartilaginous fish for that matter, from the Kuril Islands in the Russian Far East is recorded as Carcharias sp. (Lamniformes, Carchariidae). The specimen originates from Maastrichtian strata on the island of Shikotan that are assigned to the Malokurilsk Formation. It constitutes an extremely rare find from rocks of this age in the northwest Pacific region. External and internal dental structures have been reconstructed by the use of computed tomography. The vasculature of this lamniform tooth is first modelled by CT scanning and shown under different angles, which allows an assessment of the spatial arrangement of hierarchically organised vascular channels in this holaulacorhize tooth.

中文翻译：

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俄罗斯远东千岛群岛上白垩纪的首次鲨鱼记录

摘要 俄罗斯远东千岛群岛发现的晚白垩世鲨鱼牙齿或任何软骨鱼类的首次发现被记录为 Carcharias sp。（层状目，蛴螬科）。该标本来自色丹岛上的马斯特里赫特地层，属于 Malokurilsk 组。它构成了西北太平洋地区这个时代岩石中极为罕见的发现。外部和内部牙齿结构已通过使用计算机断层扫描重建。这颗板状牙的脉管系统首先通过 CT 扫描建模并以不同角度显示，这允许评估这颗 holaulacorhize 牙齿中分层组织的血管通道的空间排列。