Hocknull suggested that Austrosaurus mckillopi differed only slightly from the QMF 7292, the holotype of Wintonotitan wattsii, and should be considered a nomen dubium. Recently, Poropat et al.
Hocknull proposed that Austrosaurus mckillopi should be considered a doubtful name due to its similarity to the holotype of Wintonotitan wattsii (QMF 7292). Poropat et al. supported this idea.