 Several studies have shown that the "tapejarids" as traditionally thought of (that is, including the classic examples of both "Tapejara" and "Tupuxuara") are paraphyletic, and do not form a natural group, but instead represent sequential branches of the tree leading.In light of this discovery, several of the traditional names associated with the group have been re-defined.Martill and Naish proposed a revised definition for Tapejaridae, as all species more closely related to "Tapejara" than to "Quetzalcoatlus".