 A third North American genus called Stegomus was named by Othniel Charles Marsh in 1896 . Marsh had a long @-@ time rivalry with Cope that was made famous in the Bone Wars of the late 19th century , in which the two tried to out @-@ compete one another in the field and in scientific literature . Unlike Cope 's aetosaurs , Stegomus was found from the eastern United States in Connecticut . Marsh also recognized Stegomus as an aetosaur rather than a phytosaur in his initial description of the genus . Like Cope , many paleontologists tended to consider aetosaur scutes to belong to phytosaurs during this time period . 
