 Kritosaurus was a hadrosaurine hadrosaurid , a flat @-@ headed or solid @-@ crested duckbill . Though many species and specimens have been referred to the genus in the past , most of them do not show the shared distinguishing characteristics to allow them to be considered part of the genus , or have been synonymized with other genera of hadrosaurs . The closest relative of Kritosaurus navajovius is Anasazisaurus horneri ( or Kritosaurus horneri ) , which , together with close relatives such as Gryposaurus and Secernosaurus , form a clade called the Kritosaurini within the larger clade Saurolophinae . Location and time separate Kritosaurus and the slightly older , primarily Canadian Gryposaurus , along with some cranial details . 
