Also known as Alien Crab, Grapsid Crab, Sally Lightfoot, Sally Lightfoot Crab, Sea Urchin Crab, Shore Crab, Short Crab, True Crab, Urchin Crab.
Found singly or in consortiums clinging to jetties, beach rocks and walls over intertidal coral and rocky reefs and rocky shores.
Very shy will disappear into cracks in the rocks when approached.
They feed on seaweeds.
Width - 3cm
Depth - land-0m
Widespread Atlantic Ocean, Mediterranean, East Pacific
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 Ref: https://en.wikipedia.org/wiki/Percnon_gibbesi