Dunkleosteus

Dunkleosteus, 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 c...
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

Dunkleosteus

Dunkleosteus (from `[David] Dunkle` + osteus [οστεος, Greek: bone]) is a genus of prehistoric fish existing during the Late Devonian period, about 380–360 million years ago. Some of the species, such as D. terrelli, D. marsaisi, and D. magnificus, are among the largest arthrodire placoderms ever to have lived. The largest species, D. ter.....
Found on http://en.wikipedia.org/wiki/Dunkleosteus
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