"Dachongosaurus" is the informal name given to an undescribed genus of dinosaur from the Early Jurassic (Sinemurian-Pliensbachian[1]) of China. A sauropod (possibly a cetiosaur[2]), the type species is "Dachongosaurus yunnanensis", coined by Zhao in 1985. An alternate spelling is "Dachungosaurus". As with other informal names coined by Zhao in 1985 and 1983, nothing has since been published, and the remains may have been redescribed under another name.[3]