Blunt Decorator Crab

Found covered in rubbish, seaweed, shells, sponges, etc. These are attached by hooks to its shell, to act as camouflage against predators, making them hard to spot when walking over rubble, sand, and seagrass beds, of coral and rocky reefs.

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.