本文报道了河南汝阳盆地下白垩统郝岭组中发现的一件甲龙科恐龙化石新材料, 并据此建立了中原龙属中的一个新种——君昌中原龙(新种) Zhongyuansaurus junchangi sp. nov.。标本具有一鉴定特征: 尾部区域具有至少5枚骨质板呈燕尾状, 并彼此叠瓦式排列。此外, 下颌骨较为修长, 不及较为进步的甲龙亚科粗壮; 冠状骨的前端仅延伸至最后两个牙槽, 不同于沙漠龙; 棒状末端尾椎表面附着小的骨质板, 以及肱骨骨干周长和肱骨长度的比值为0.46, 将它和洛阳中原龙区分开来。本文对该标本的骨骼形态进行了详细描述, 并与近缘属种进行分析对比,探讨了其系统分类及形态特征的演化意义。

This study describes new ankylosaurid dinosaur fossil material discovered in the Haoling Formation of the Lower Cretaceous strata in the Ruyang Basin, Henan Province. Based on this material, a new species within the genus Zhongyuansaurus is established: Zhongyuansaurus junchangi sp. nov. This species is characterized by a unique au tapomorphy: at least five caudal armor plates arranged in a shingle-like pattern with a distinctive swallowtail shape. Additionally, it exhibits relatively slender mandibular bones compared to the more robust mandibles of advanced An-kylosaurinae. The anterior tip of the coronoid process extends only to the last two alveoli, differing from Shamosaurus. The distal caudal vertebrae are adorned with small osteoderms, and the humerus has a midshaft circumfer ence-to-total-length ratio of 0.46, distinguishing it from Zhongyuansaurus luoyangensis. The discovery of Zhong yuansaurus junchangi provides new insights into the evolution of ankylosaurs in the Lower Cretaceous strata of Ruyang and enhances the species diversity of the Ruyang dinosaur fauna.

河南自然博物馆揭榜挂帅项目(2021002)资助