Serene's Black Coral Crab

Found between the finger-like branches of black coral formations, over coral and rocky reefs.
They hide during the day coming out at night to spread their arms and feed.
They feed on plankton.

Brachyura crabs are considered true crabs, they have a short abdomen, 4 walking legs and a pair of clawed arms at the front.
Many thousands of species live worldwide in sea water, fresh water and on land.