 In "Shansisuchus" the premaxilla, a bone that makes up the front of the snout, projects backward and fits into a groove in the nasal, a bone that makes up the top of the snout.The subnarial fenestra is present between the external nares (nasal opening) and the antorbital fenestra, a hole in front of the eye socket.It is separated from the antorbital fenestra by a vertical projection of the maxilla bone.