 Felipe Pinheiro and colleagues (2011) reclassified the group as a subfamily of Tapejaridae, Chaoyangopterinae, for this reason.The exact relationships of tapejarids to one another and to other azhdarchoid pterosaurs has historically been unclear, with different studies producing significantly different cladograms (family trees).It is also unclear exactly which pterosaurs belong to the Tapejaridae; some researchers have found the thalassodromines and chaoyangopterines to be members of this family, while other studies have found them to be more closely related to the azhdarchids (in the clade Neoazhdarchia).