This link has an illustration of Euhelopus, which is related to Yunmenglong. Both are in the clade Somnospondyli. The image gives an idea of how Yunmenglong would have looked.
Yunmenglong ruyangensis was a sauropod dinosaur of the Cretaceous. The systematic paleontology of it is:
Dinosauria Owen 1842
Saurischia Seeley 1887
Sauropodomorpha von Huene 1932
Sauropoda Marsh 1878
Somnospondyli Wilson and Sereno 1998
Yunmenglong Junchang Lu et al. 2013
Yunmenglong ruyangensis Junchang Lu et al. 2013
Junchang Lu, Li Xu, Hanyong Pu, Xingliao Zhang, Yiyang Zhang, Songhai Jia, Huali Chang, Jiming Zhang, and Xuefang Wei wrote an article titled A new sauropod dinosaur (Dinosauria, Sauropoda) from the late Early Cretaceous of the Ruyang Basin (central China). It was published in 2013 in Cretaceous Research. The abstract is on this link.