An ancient fossil octopus-like creature was thought to be the ancestor of all living octopuses.

Researchers have analysed the creature again and now realise this was not the case, as you can see in the video above.

The research is published in the journal Palaeontology.

Join over six million BBC Earth fans by liking us on Facebook, or follow us on Twitter and Instagram.

If you liked this story, sign up for the weekly bbc.com features newsletter called "If You Only Read 6 Things This Week". A handpicked selection of stories from BBC Future, Earth, Culture, Capital, Travel and Autos, delivered to your inbox every Friday.