Shan Bingqing
Department of Paleontology College, Shenyang Normal University, Shenyang, Liaoning Province, China.
PeerJ. 2025 Mar 11;13:e19154. doi: 10.7717/peerj.19154. eCollection 2025.
is one of three sauropod species found in the Jehol Biota. is from the Lower Cretaceous Yixian Formation in Liaoning, China. The discovery of was an important breakthrough for researching the diversity of giant herbivorous animals in the Jehol Biota. However, the research and analysis of are not yet complete. This study presents a comprehensive research and analysis of holotype. First, the skull, vertebrae, pelvic girdle, and appendicular elements of holotype were carefully reexamined, leading to the discovery of mosaic evolution occurring in the skull and the identification of one new autapomorphy of humerus of : the attachment point of coracobrachialis muscle on the anterior surface of the proximal end of the humerus is flat. Second, the characteristics of the holotype and other well-preserved sauropod dinosaurs were used to reconstruct the skull of . Next, was used to reconstruct the body type of holotype, the result indicating that was approximately 10 m in length. Finally, TNT software was utilized to analyze the phylogenetic position of , with the result indicating that can be classified into the Euhelopodidae.
是热河生物群中发现的三种蜥脚类物种之一。它来自中国辽宁下白垩统义县组。该物种的发现是研究热河生物群中巨型食草动物多样性的一个重要突破。然而，对该物种的研究和分析尚未完成。本研究对该物种的正模标本进行了全面的研究和分析。首先，仔细重新检查了该物种正模标本的头骨、脊椎、骨盆带和附肢骨骼，发现头骨存在镶嵌进化现象，并确定了该物种肱骨的一个新的自近裔性状：肱二头肌短头在肱骨近端前表面的附着点是平的。其次，利用该物种正模标本和其他保存完好的蜥脚类恐龙的特征对头骨进行了重建。接下来，用它来重建该物种正模标本的体型，结果表明其体长约为10米。最后，利用TNT软件分析了该物种的系统发育位置，结果表明它可归入马门溪龙科。
