 The type specimen of Kritosaurus navajovius is only represented by a partial skull and lower jaws, and associated postcranial remains. The greater portion of the muzzle and upper beak are missing. The length of the skull is estimated at 87 centimeters (34 in) from the tip of the upper beak to the base of the quadrate that articulates with the lower jaw at the back of the skull. Potential diagnostic characteristics of Kritosaurus include a predentary (lower beak) without tooth-like crenulations, a sharp downward bend to the lower jaws near the beak, and a heavy, somewhat rectangular maxilla (upper tooth-bearing bone).
