Sekiya in 2011 and Moore and colleagues in 2020 treated "M. constructus, M. hochuanensis," ZDM 0126 "(M. hochuanensis" referred"), M. sinocandadorum, and M. youngi" separately in their analyses. Moore and colleagues analyses found the position of "M. constructus" to be unstable, probably due to the limited character information in its original description. Depending on the dataset used, "Euhelopus" would either be within Macronaria as other studies have found or outside Neosauropoda in a more traditional position, grouped with other "Mamenchisaurus-"like taxa. The latter scenario would make mamenchisaurids members of Euhelopodidae. The analyses of Sekiya (2011) and Moore and colleagues (2020) didn't recover ZDM 0126 as a sister taxon to the holotype of "M. hochuanensis," questioning its referral to the species.