DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Butterflyfish (Chaetodon sp.) fossil. Fossils of this tropical fish have been found dating as far back as the Miocene era, around 40 million years ago. There are still over 90 living species of Chaetodon. This fossil, from Spain, measures 170 millimetres long.
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