Yunmenglong

 ( Macronaria ) 

Yunmenglong (meaning "Yunmeng dragon", after the Yunmengshan area where it was found) is an extinct genus of somphospondyli sauropod known from the late Early Cretaceous of Henan Province, central China. Its remains were discovered in the Haoling Formation of the Ruyang Basin. The type species is Yunmenglong ruyangensis, described in 2013 by Junchang Lü et al. on the basis of an incomplete postcranial skeleton. Yunmenglong shares some characters with Euhelopus, Qiaowanlong, and Erketu; a phylogenetic analysis places it as a sister taxon of Qiaowanlong, both grouped with Erketu in a position more derived than Euhelopus but basal to Titanosauria.

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Size Yunmenglong was a giant sauropod dinosaur, as evidenced by the complete right femur at about long and in distal width, which is comparable to other giant Chinese genus, Fusuisaurus.Jinyou Mo, Jincheng Li, Yunchuan Ling, Eric Buffetaut, Suravech Suteethorn Varavud, Suteethorne Haiyan Tong, Gilles Cuny, Romain Amiot & Xing Xu (2020). New fossil remain of Fusuisaurus zhaoi (Sauropoda: Titanosauriformes) from the Lower Cretaceous of Guangxi, southern China. Cretaceous Research: 104379 /ref> In 2016, Paul estimated it at in length and in weight. In 2020, Molina-Pérez and Larramendi gave a larger length of and a similar weight of .

Categories: Macronaria, Dinosaur Genera, Aptian Dinosaurs, Albian Dinosaurs, Dinosaurs Of China, Fossil Taxa Described In 2013, Taxa Named By Lü Junchang

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