After Upchurch, 1998

<==o †Euhelopodidae [incl. Mamenchisaurinae Young & Chao, 1972; Shunosaurinae McIntosh, 1990]
   |-- †Shunosaurus lii Dong, Zhou & Zhang, 1983
   `--+?- †“Hudiesaurus sinojapanorum” Dong, 1997 [nomen nudum]
      |?- †Klamelisaurus gobiensis Zhao X., 1993
      |?- †Tienshanosaurus chitaiensis Young, 1937
      |?- †Datousaurus bashanensis Dong & Tang, 1984
      |-- †Bellusaurus sui Dong, 1990
      `--+--o †Omeisaurus Young, 1939
         |  |?- †O. changshouensis Young, 1958a
         |  |-- †O. junghsiensis Young, 1939
         |  `-- †O. tianfuensis He, Li, Cai & Gao, 1984
         `--+-- †Euhelopus zdanskyi (Wiman, 1929) Romer, 1956 [Helopus zdanskyi Wiman, 1929]
            |-- †Tehuelchesaurus benitezii Rich, Vickers-Rich, Gimenez, Cúneo, Puerta & Vacca, 1999
            `--o †Mamenchisaurus Young, 1954 [ [Zigongosaurus Hou, Chao & Chu, 1976; “Moshisaurus” Hisa, 1985 (nomen nudum)]
               |-- †M. constractus Young, 1954
               |-- †M. hochuanensis Young & Chao, 1972
               |-- †M. fuxiensis (Hou, Zhao & Chu, 1976) [Zigongosaurus fuxiensis Hou, Chao & Chu, 1976]
               |?- ?†M. sinocanadorum D. Russell & Zheng, 1994
               |-- †M. anyuensis He, Yang, Cai, Li & Liu, 1996
               |-- †M. youngi Pi, Quyang & Ye, 1996
               `-- †M. jingyanensis Zhang & Li in Zhang & Chen, 1996

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