In 1976, Hou, Chao and Chu named a new genus, "Zigongosaurus fuxiensis'." Known from at least four specimens from the Upper Shaximiao Formation. The type specimen (CV 00261??"') included skull material; maxilla, dentary, and basioccipital. Additional material includes dorsal vertebrae, pubis, and ischium. Since then other researchers have disagreed as to whether the genus is valid. Dong, Zhou and Zhang assigned the remains to the similarly named "Omeisaurus fuxiensis" in 1983. Zhang and Chen assigned the remains to "Mamenchisaurus" as "M." "fuxiensis" in 1996. Li and Cai considered it a "nomen nudum" in 1997. In 1999, Valérie Martin-Rolland considered "Zigongosaurus" a valid genus. Wang and colleagues considered it undiagnostic in 2019.