A joint study by Jeffrey Wilson and Paul Upchurch, who had previously taken opposite sides in the debate, concluded that Euhelopus was closely related to titanosaurs. However, the lack of research on Mamenchisaurus-like taxa has hindered proper testing of this hypothesis, and there are several similarities between Euhelopus and Mamenchisaurus-like taxa that have not been taken into account in most analyses.
A collaborative study by Jeffrey Wilson and Paul Upchurch, who had previously held opposing views, found that Euhelopus was closely connected to titanosaurs. Nevertheless, the scarcity of research on similar species like Mamenchisaurus has hindered a thorough investigation of this theory, and several similarities between Euhelopus and these comparable species have been overlooked in most studies.