Watch the amazing moment when Sir David Attenborough and BBC filmmakers recorded the discovery of a fish that shocked science.

Even better, you can watch a further 1000 more memorable moments, for free, anytime, on your smartphone or tablet, via Attenborough's Story of Life app, which is now available to download via Google Play, or Apple's app store.

Find out more at http://www.bbc.com/earth/storyoflife.

The Story of Life has been produced in collaboration with Sir David Attenborough, BBC Earth and ideas and innovation company AKQA.