Scientists say the 'jaw-dropping' discovery gives an insight into the evolution of human hearts.
The fish are perfectly preserved in boulders found in the Kimberley region of Western Australia
The Gogo fish is the first of a class of prehistoric fish called placoderms. These were the first fish to have jaws and teeth. Before them, fishes were no bigger than 30cm, but placoderms could grow up to nine metres in length. The researchers suggest this made the animal's heart more efficient and was the critical step that transformed it from a slow-moving fish to a fast-moving predator.The researchers scanned inside the boulders to discover a liver, stomach, intestines and a heart, shown in redThe other important observation was that the heart was much more forward in the body than those of more primitive fish.
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