Klamelisaurus (meaning "Kelameili Mountains lizard") is a genus of herbivorous sauropod dinosaur from the Middle Jurassic Shishugou Formation of China. The type species is Klamelisaurus gobiensis, which was named by Zhao Xijin in 1993, based on a partial skeleton discovered in 1982 near the abandoned town of Jiangjunmiao. Zhao described Klamelisaurus as the only member of a new subfamily, Klamelisaurinae, among the now-defunct primitive sauropod order Bothrosauropodoidea. Since Zhao's description, Klamelisaurus received limited attention from researchers until Andrew Moore and colleagues redescribed it in 2020. A relatively large sauropod measuring approximately long, with half of the length being its neck, Klamelisaurus can be distinguished from its relatives by characteristics of the and . Phylogenetic analyses have suggested that Klamelisaurus belonged to the Mamenchisauridae, a group of Middle to Late Jurassic and primarily Chinese sauropods, although its close relatives also include a mamenchisaurid from Thailand. While paleontologist Gregory S. Paul suggested that Bellusaurus, known only from juvenile specimens, was a juvenile Klamelisaurus, this proposal has been rejected based on anatomical evidence, and the fact that Bellusaurus was geologically younger. Discovery and naming Between 1981 and 1985, a field crew from the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) conducted excavations in the Junggar Basin of the Xinjiang Autonomous Region of China, as part of a research project titled "Evolution of the Junggar Basin and the Formation of Petroleum". The work was conducted in cooperation with the Chinese Academy of Sciences and the Xinjiang Office of Petroleum. In 1982, these excavations uncovered the skeleton of a sauropod dinosaur north of the now-abandoned town of Jiangjunmiao, located in the eastern Junggar Basin. The skeleton was excavated and collected in 1984 by the IVPP field team. The specimen, which was catalogued under the specimen number IVPP V9492, consists of teeth, most of the vertebral column (save for the first seven (neck vertebrae) and the end of the tail), , the right shoulder girdle and arm (, , , , , and ), and the right hip girdle and leg (, , , , , and ). At the time of its discovery, the specimen was already weathered. After it was transported to Beijing, with preparation and restoration work beginning in 1985, it deteriorated further due to fluctuations in temperature and humidity. Nearly all of the bones underwent reconstruction and painting, and many of them were encased in a metal armature for display. The referral