青藏高原存在着二叠纪华夏与冈瓦纳植物群的部分界限。本文报道中国青海省沱沱河地区乌丽煤矿邻近区达哈煤矿一处新的晚二叠世大羽羊齿化石产地, 描述产于泥岩层中的大羽羊齿叶片化石 4 属 5 种。其中 Gigantopteris cf. dictyophylloides、Filigigantopteris asymmetrica 及 F. dahaia 等具双重网脉大羽羊齿植物的发现, 进一步明确当前化石产地为华夏植物地理区的属性, 同时为该类型植物向西迁移至中东地区提供了重要的桥梁证据。此外, 当前大羽羊齿叶片化石大小悬殊, 且未发现长叶柄、钩或刺状结构, 推测这几类大羽羊齿植物可能不具备攀援的生长习性。

The Tibetan Plateau contains part of the boundary between the Permian Cathaysian and Gondwanan floras. In this paper, we report a new gigantopterid fossil locality from the upper Permian of Daha Coalfield, an area close to the Wuli Coalfield in the Tuotuohe District of Qinghai Province, China. We describe five species in four genera of gigantopterid leaves collected from a mudstone bed. Among these fossils, the discovery of double-meshed gigantopterids such as Gigantopteris cf. dictyophylloides、Filigigantopteris asymmetrica and F. dahaia further demonstrates the palaeogeographic affiliation of the fossil locality with the Cathaysian Realm, and suggests the existence of a land bridg for the westward expansion of the Cathaysian flora to the Middle East. In addition, the leaves vary greatly in size. The lack of long petioles, hooks and prickles suggests that these gigantopterid plants may not be climbers.

国家自然科学基金(41802011, 42172018)、中国科学院战略性先导专项(B) (XDB26000000)、中国地质调查局项目(DD20221661)和现代古生物学与地层学国家重点实验室(20201103)联合资助