Abstract

A caudal vertebra of a dinosaur (Iguanodontia indet.) is described from Upper Cretaceous (lower Campanian) coastal marine deposits of Izhberda Quarry near Orsk (Orenburg oblast). The vertebra is characterized by a rectangular centrum in the lateral view and transverse processes located at the level of the neurocentral suture. This is the second record of a dinosaur in the region. The previously described dinosaur vertebra from Upper Cretaceous deposits near Orsk (Bogolyubov, 1912) was the first record of a dinosaur from Russia. The caudal vertebra from Izhberda Quarry belonged to a dinosaur about 5 m in length, which may indicate the absence of an island isolation effect in dinosaurs that inhabited the large islands of the Turgai Strait in the Late Cretaceous.

中文翻译：

---

来自南乌拉尔的新恐龙化石

摘要

恐龙 (Iguanodontia indet.) 的尾椎骨来自 Orsk（奥伦堡州）附近 Izhberda 采石场的上白垩纪（下坎帕阶）沿海海洋沉积物。椎骨的特征是侧视图中的矩形中心和位于神经中枢缝合线水平的横突。这是该地区恐龙的第二项记录。先前描述的来自奥尔斯克附近上白垩纪沉积物的恐龙椎骨（Bogolyubov，1912）是俄罗斯恐龙的第一个记录。Izhberda 采石场的尾椎属于一种长约 5 m 的恐龙，这可能表明晚白垩世栖息在图尔盖海峡大岛的恐龙没有岛屿隔离效应。