DEAGOSTINI / UIG / SCIENCE PHOTO LIBRARY DEAGOSTINI / UIG / SCIENCE PHOTO LIBRARY
Prehistoric fish. Computer illustration of a group of placoderms and a shark in an ancient ocean. Placoderms were armoured prehistoric fish that lived from the Silurian (around 430 to 415 million years ago) to the end of the Devonian Period (around 380-360 million years ago).
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