 Horner originally assigned the Anasazisaurus skull to Kritosaurus navajovius , but Hunt and Lucas could not find any diagnostic features in the limited material of Kritosaurus and judged the genus to be a nomen dubium . Since the Anasazisaurus skull did have diagnostic features of its own , and did not appear to them to share any unique features with Kritosaurus , it was given the new name Anasazisaurus horneri , an opinion which was supported by some later authors . Not all authors have agreed with this , Thomas E. Williamson in particular defending Horner 's original interpretation , and several subsequent studies recognized both distinct genera . 
