From Fins into Hands – Scientists Discover a Deep Evolutionary Link

For anyone interested in the (broader) subject there is a surprisingly readable book on the topic: Gaining Ground: The Origin and Evolution of Tetrapods [0]

Interestingly enough, in this book I've learned about yet another meaning of the term 'process' (ie. a prominence or projection, as from a bone), when I realized what it means in the context I had to go back some 20 pages and read again :)

[0] https://www.amazon.com/Gaining-Ground-Second-Evolution-Tetra...

Fully open version: https://news.uchicago.edu/article/2016/08/18/discovery-revea...