 A new genus of aetosaur , Aetobarbakinoides , was named in 2012 . The phylogenetic analysis in that study found Aetosaurinae to be a paraphyletic grouping . As a paraphyletic group , aetosaurines would share a most recent common ancestor that is also the ancestor of other non @-@ aetosaurine aetosaurs , and thus could not form their own clade . Parker 's 2007 analysis accepted this definition . In 2002 , Heckert and Lucas defined Aetosaurinae as " a stem @-@ based taxon containing all taxa more closely related to Aetosaurus than to the last common ancestor of Aetosaurus and Desmatosuchus " . The 2012 study placed Aetosaurus at the base of the stagonolepidid clade , with traditional aetosaurine taxa placed in successively more derived positions . In the analysis , these taxa are actually more closely related to Desmatosuchus than to Aetosaurus . Thus , under Heckert and Lucas 's definition Aetosaurinae might be restricted to only Aetosaurus itself . 
