By Devonian standards, Dunkleosteus was highly evolved. It was one of the earliest jawed fishes. Instead of actual teeth, Dunkleosteus possessed two long, bony blades that could slice through flesh and snap and crush bones and almost anything else. Dunkleosteus had the most powerful bite of any fish, well ahead of sharks, including the Great White.
There are no modern descendants. Although Placoderms only existed for 50 million years, their mark on the fossil record is quite visible. They were a pioneer in the later scenes of the Paleozoic, and were vital to the success of the vertebrates. The Placoderms died out in the late Devonian for reasons that are still not well understood…
(read more: Dinopedia) (image: Raptor555)