 Kritosaurus is an incompletely known genus of hadrosaurid ( duck @-@ billed ) dinosaur . It lived about 74 @.@ 5 @-@ 66 million years ago , in the Late Cretaceous of North America . The name means " separated lizard " ( referring to the arrangement of the cheek bones in an incomplete type skull ) , but is often mistranslated as " noble lizard " in reference to the presumed " Roman nose " ( in the original specimen , the nasal region was fragmented and disarticulated , and was originally restored flat ) . Despite the dearth of material , this herbivore appeared frequently in dinosaur books until the 1990s , although what was usually represented was the much more completely known Gryposaurus , then thought to be a synonym . 
