Palythoa caribaeorum.

These corals spread along the entire coast of South America in the Atlantic Ocean. They are one of the most interesting corals I have ever seen, they react to close movement by closing in quickly.

This coral is also one of the most toxic corals you can find off the coast of South America. I had 2 experiences with this toxin, the first I ended up rubbing my face after playing with these corals and it gave me a severe allergy.

The second time I was hit by a strong current that threw me directly into a wall of these corals, I had an open wound and it went directly into the corals. I had a slight infection that made my wound take 2 weeks to close completely.