 In Parrish 's phylogenetic analysis , Aetosaurus was found to be the most basal member of the clade , the earliest to diverge after the most recent common ancestor . After Aetosaurus , there is a polytomy of three smaller clades in which it is unknown which clade diverged first from the group . Within this polytomy there was Neoaetosauroides , a clade containing Aetosauroides and Stagonolepis , and another polytomy that included Longosuchus , Desmatosuchus , and a clade containing Paratypothorax and Typothorax . 
