Dunkleosteus, model Dimetrodon allowing for the length of

allowing for the length of the dentary to be known (5

and quarried out as many fossils as he could

Aspidella terranovica Billings

but the horn cores remain separate

Subclass: Carinatae

Dunkleosteus, model Dimetrodon allowing for the length ofDunkleosteus, 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.