The lower jaw is long and low.
At its rear side, a large armour plate is present.
According to Arbour and Evans, this is not a fused osteoderm, but instead an outgrowth of the jaw bones themselves.
The adductor fossa, the opening through which the muscles closing the jaw entered its hollow inside, is relatively small and shallow.
The dentary, the bone bearing the teeth, at the front curves sharply to the inside.
This way both dentaries together had a profile fitting in the broad snout.
The tooth row has a length of about 16 centimetres (6.3 in).

At the rear underside of the right lower jaw numerous ossicles, small bony scales, are visible.
The largest of these are rectangular and up to 14 mm (0.55 in) high.
They lie directly below the large armour plate.
Even lower, rows of smaller hexagonal or diamond-shaped ossicles are positioned, of about 6 mm (0.24 in) in diameter, grouped in rosettes.
The lower jaw is long and low. At its rear side, a large armour plate is present. According to Arbour and Evans, this is not a fused osteoderm, but instead an outgrowth of the jaw bones themselves. The adductor fossa, the opening through which the muscles closing the jaw entered its hollow inside, is relatively small and shallow. The dentary, the bone bearing the teeth, at the front curves sharply to the inside. This way both dentaries together had a profile fitting in the broad snout. The tooth row has a length of about 16 centimetres (6.3 in).
At the rear underside of the right lower jaw numerous ossicles, small bony scales, are visible. The largest of these are rectangular and up to 14 mm (0.55 in) high. They lie directly below the large armour plate. Even lower, rows of smaller hexagonal or diamond-shaped ossicles are positioned, of about 6 mm (0.24 in) in diameter, grouped in rosettes.
Zuul