In 2007, Lü Junchang and colleagues described another species of "Yunnanosaurus", "Y. youngi" (named in honor of C. C. Young). In addition to various skeletal differences, at 13 meters (42 ft) long "Y. youngi" was significantly larger than "Y. huangi" (which reached only 7 meters [23 ft]). "Y. youngi" is found later in the fossil record, hailing from the Middle Jurassic. The holotype specimen CXMVZA 185 consists of ten cervical vertebrae, fourteen dorsal vertebrae, three fused sacral vertebrae, seventeen caudal vertebrae, both pubic bones, both ischia, and the right illium. The skull of this species is not known.