Dunkleosteous belonged to a group of armoured fish called placoderm of the devonian period. it is known for its large massive head and its armour plated body .dunkeosteus had sharp bony plates instead of tooth , its jaws could produce a biteforce of upto 74000N ( 755kg) it was the largest predator of its time with largest species reaching a length of around 20ft and 1000 kg in weight similar to the size of great white shark it probably fed on smaller pray like other placodeen and fishes while early sharks such as small cladoselache was also present in its ecosytem. dunkleostus fossils have been found with bitemarks of others of its kind. placoderm as a group went extinct at the end of the devonian.

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