Cyamodus

Cyamodus was a placodontid from what is now Germany. It lived during the middle Triassic.

Features
The obvious feature of Cyamodus is the two-part shell or carapace on the upper surface of the body. The main part of the shell covers the body to the hips and spreads out to the side, almost covering the span of the limbs. A second plate covers the hips and the base of the tail. The shells are covered in hexagonal or circular plates of armour. The skull is broad and heart-shaped, and is particularly strong at the rear.

Trivia

 * Juvenile specimens of Cyamodus appear to have an extra tooth on the roof of the mouth, compared with adults.  It seems possible that they reduced the number of teeth as they grew to maturity.