Strange and unusual echinoid
This is a very odd echinoid and while it's a truly fascinating fossil I really can't tell you a great deal about it.
While most echinoids are easily described and are basically the same as modern sea urchins - this is more of an oddity and has a bizarre flattened shape which then has protruding fingers like a starfish...!
It comes from Senegal in Africa and is approx 5 million years old.
If you know more about it please let me know!