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Dunkleosteus sp. The name Dunkleosteus comes from the Greek 'osteus' (οστεος), meaning "bone", and Dunkle, in honor of David Dunkle of the Cleveland Museum of Natural History. They are the argest arthrodire placoderms that ever to have lived. They had a primitive, yet robust jaw structure. Due to its heavily armoured head section, Dunkleosteus was probably a fairly slow yet powerful swimmer living in near shore environments. Fossilization tends to have preserved only the armoured frontal boney sections, so it is uncertain what exactly the hind sections of this ancient fish were like. This group of fish died out during the transition between the Devonian and Carboniferous periods - although the sharks survived.
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