A new mamenchisaurid from the Upper Jurassic Suining Formation of the Sichuan Basin in China and its implication on sauropod gigantism.

IF 3.9 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Scientific Reports Pub Date : 2025-07-10 DOI:10.1038/s41598-025-09796-0

Xuefang Wei, Yuanjun Tan, Shan Jiang, Jun Ding, Lei Li, Xiaobing Wang, Yiyang Liu, Guangbiao Wei, Deliang Li, Yu Liu, Guangzhao Peng, Shizhen Zhang, Changling Lao

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Abstract

The Sichuan Basin has yielded abundant sauropod dinosaurs from the Middle-Late Jurassic, and Mamenchisauridae had predominated the dinosaur faunae during the Late Jurassic in the Sichuan Basin. Here, we describe a new sauropod dinosaur, Tongnanlong zhimingi gen. et sp. nov. from the Upper Jurassic Suining Formation in the Sichuan Basin, southwestern China. The holotype includes three dorsal and six caudal vertebrae, scapula, coracoid, and some hindlimb bones. It is diagnosed by the complex structures of the dorsal and anterior caudal vertebrae compared to other mamenchisaurids. Phylogenetic analysis shows that it is more closely related to Mamenchisaurus than to Omeisaurus. The huge-sized scapula and coracoid also indicate that the specimen belongs to an extremely gigantic individual with a body length approaching about 25 ~ 26 m. The new specimen enriches the diversity of Mamenchisauridae and provides additional information for understanding the evolution and diversity of eusauropod dinosaurs.

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四川盆地上侏罗统遂宁组一新门门龙及其对蜥脚类巨兽的启示。

四川盆地中晚侏罗世蜥脚类恐龙丰富，晚侏罗世以马门溪龙科为主。本文描述了四川盆地上侏罗统绥宁组中一种新的蜥脚类恐龙Tongnanlong zhimingi gen. et sp. 11 .。全型包括三个背椎骨和六个尾椎骨、肩胛骨、喙骨和一些后肢骨。与其他马鼻龙相比，它是通过复杂的背椎骨和前尾椎骨结构来诊断的。系统发育分析表明，它与马门溪龙的亲缘关系比与梅角龙的亲缘关系更近。巨大的肩胛骨和喙骨也表明该标本属于一个极其巨大的个体，体长约为25 ~ 26米。这一新标本丰富了马门鸟科的多样性，为了解真蜥脚类恐龙的进化和多样性提供了额外的信息。

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来源期刊

Scientific Reports Natural Science Disciplines-

CiteScore

7.50

自引率

4.30%

发文量

19567

审稿时长

3.9 months

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