Dunkleosteus, model Baryonyx Until this point the Precambrian

Until this point the Precambrian was thought to be completely devoid of fossils and consequently possibly of life

thick tail

It likely travelled in herds

bony plates called scutes giving it the appearance of a giant turtle

Dunkleosteus, model Baryonyx Until this point the PrecambrianDunkleosteus, the biggest member of the family Dinichthyidae ("terrible fishes"), was a heavily armored primitive fish from the late Devonian period, about 360 million years ago. This top predator was up to 11. 5 ft (3. 5 m) long and had large, scissor like cutting jaws with serrated, razor sharp bones, but no teeth. Its skull was was over 2 feet (65 cm) long. It had a jointed neck, an eel like tail, a scale less body, and hinged body shields.