 In 2003 , paleontologists Simon R. Harris , David J. Gower , and Mark Wilkinson examined previous phylogenetic studies of aetosaurs and criticized the way in which they used certain characters to produce cladograms . They concluded that only three hypotheses of aetosaur relationships from previous studies were still true : that Aetosaurus is the most basal aetosaur , that Aetosauroides is the sister taxon of Stagonolepis robertsoni , and that Longosuchus and Desmatosuchus are more closely related to each other than either is to Neoaetosauroides . They also went on to correct the trees from all previous analyses . 
