Also known as Flat Rock Crab, Nimble Spray Crab, Sally Lightfoot Crab, Sally Longlegs, Shore Crab, Spray Crab, True Crab.
Found in crevices and holes clinging to jetties, beach rocks and walls over intertidal coral and rocky reefs.
They feed on algae.
Width - 2.5cm
Depth - 0-10m
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_planissimum