CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Dunkleosteus prehistoric fish, artwork. This extinct fish lived in the Devonian period (408-360 million years ago). Dunkleosteus was a large predatory fish that had plates of sharp bone within its jaws instead of teeth. It belonged to the class known as Placodermi, which were distinguished by having heavily-armoured heads and a scaleless body. Some species of Dunkleosteus are thought to have reached lengths approaching ten metres.
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