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Dunkleosteus (From "(David) Dunkle" + osteus meaning "Dunkle's Bone") is a prehistoric fish, one of the largest arthrodire placoderms ever to have lived, existing during the Late Devonian period, about 380-360 million years ago.

This hunter, measuring 3.5 metres (11 ft) and weighing 1 tonne (1.1 short tons), was a hypercarnivorous apex predator. Few other placoderms, save, perhaps, its contemporary, Titanichthys, rivaled Dunkleosteus in size.

Dunkleosteus is member of the pachyosteomorph arthrodires, and is more specifically usually placed in the family Dinichthyidae, a family composed mostly of large, carnivorous arthrodires like Gorgonichthys. Anderson (2009) suggests that because of its primitive jaw structure Dunkleosteus should be placed outside the family Dinichthyidae, perhaps close to the base of the clade Pachyosteomorpha, near Eastmanosteus, but this idea has yet to be tested.

New studies have revealed several features in both its food and biomechanics as its ecology and physiology. The Placodermi first appeared in the Silurian, and the group became extinct during the transition from the Devonian to the Carboniferous, leaving no descendants. The clast lasted barely 50 million years, in comparison to the 400 million year old history of sharks.

In recent decades, the Dunkleosteus has achieved recognition in popular culture, with a large number of specimens on display, and notable appearances in entertainment media. Numerous fossils of some species have been found in North America, Poland, Belgium and Morocco.

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