Named By : L. Xing, T. Miyashita, J. Zhang, D. Li, Y, Ye, T, Sekiya, F. Wang & P. Currie - 2015
Diet : Herbivore
Size : Estimated 15 meters long
Type of Dinosaur : Sauropod
Type Species : Q. guokr (type)
Found in : China - Suining Formation
When it Lived : Early Cretaceous, 115 million years ago
Qijianglong is an genus of herbivorous mamenchisaurid dinosaurs from the Early Cretaceous period of China.
In his backyard, farmer Cai Changming from Heba village in Sichuan discovered the first vertebra of Qijianglong in the 1990s. In 2006, a rich fossil quarry was discovered at Qijiang District’s construction site. The skeleton was discovered after the excavation of the quarry. The type species Qijianglong guokr, which was discovered in 2015 by Xing Lida, Tetsuto Mikashita (University of Alberta), Zhang Jianping and Wang Fengping, was described and named in 2015. The generic name is a combination of the Mandarin long, “dragon” district Qijiang. Guokr, the Chinese scientific social network’s specific name, is what you would call it.
Based on radiometric dating, the holotype QJGPM1001 was discovered in a layer from the Suining Formation. It was originally thought to date back to the Late Jurassic. However, it is now considered midCretaceous (late Aptian). It is composed of a partial skull and skeleton. It includes the rear end of the skull, a part of the right lower jaw, and a complete series (17 neck vertebrae), the first six back vertebrae. Ribs, the probable tenth rear tail vertebrae, and chevrons. There are also two upper pedal phalanges. It is likely to be a large, but still immature juvenile.
Qijianglong’s holotype was approximately fifteen meters in length and had a long neck. There were four autapomorphies among the distinguishing characteristics that were identified by the describing authors. The lower braincase’s processus basipterygoideus is in the shape of a plate. It is oriented along its body axis and has an additional boss that runs parallel to the tubera basilaria. Postzygapophyses, which are the rear joint processes of the neck vertebrae, have an extension that is finger-shaped. This extends the neck vertically while stiffening it in the horizontal plane. Pneumatopores are pneumatic openings in the depression between diapophysis and the upper rib joint processes. The pubic bone’s front edge is concave and curves so much that the lower end is directed more towards the front than its bottom.