Dunkleosteus belonged to a group of armoured fish called placoderms of the devonian period. it is known for its large massive head, and its armour plated body.Dunkleosteus had sharp bony plates instead of tooth, its jaws could produce a bite force of up to 74000N (755kg), roughly equivalent to that of Tyrannosaurus, plus its jaws open and close less than half the time a guillotine would snap. It was the largest predator of its time with largest species reaching a length of around 12 meters and 1000 kg in weight larger than the size of a Great White Shark. Like its cousins, Rhizodus, Saivodus & Helicoprion/Whorl-Tooth Shark, it probably fed on smaller prey like other placoderms and fishes while early sharks such as small Cladoselache & Stethacanthus was also present in its ecosytem. Dunkleosteus fossils have been found with bitemarks of others of its kind. placoderms as a group went extinct at the end of the Devonian.