Yin Ya-Lei, Li Yang, Hu Jin, Zhang Hong-Gang
College of Paleontology, Shenyang Normal University, Shenyang, Liaoning, China.
Key Laboratory of Evolution of Past Life in NE Asia, Ministry of Natural Resources, Shenyang, Liaoning, China.
PeerJ. 2025 Feb 20;13:e19013. doi: 10.7717/peerj.19013. eCollection 2025.
Here, two dinosaur teeth are discovered from the Lower Cretaceous Jiufotang Formation in Longcheng, Chaoyang, western Liaoning, China. This discovery marks a new fossil site for the Jehol Biota, characterized by three-dimensionally preserved fossils. Based on comprehensive morphological comparisons, the teeth can be assigned to Theropoda and early-diverging Titanosauriformes. The theropod tooth, with a preserved length of 47.8 mm, represents a distinct taxon separate from , which is the only known large theropod dinosaur from the Jiufotang Formation. The titanosauriform tooth represents the youngest sauropod record within the Jehol Biota. These findings contribute to an increased dinosaur diversity within the Jiufotang Formation from ten taxa to 12.
在此，在中国辽宁西部朝阳龙城的下白垩统九佛堂组发现了两颗恐龙牙齿。这一发现标志着热河生物群一个新的化石地点，其特点是化石呈三维保存。基于全面的形态学比较，这些牙齿可归入兽脚亚目和早期分化的泰坦巨龙形类。这颗兽脚亚目牙齿保存长度为47.8毫米，代表了一个与[具体物种名称缺失]不同的独特分类单元，[具体物种名称缺失]是九佛堂组已知的唯一大型兽脚亚目恐龙。泰坦巨龙形类牙齿代表了热河生物群中最年轻的蜥脚类记录。这些发现使九佛堂组的恐龙多样性从十个分类单元增加到了十二个。
