Longnose Spider Crab

Found in shallow waters, covered in rubbish, seaweed, shells, sponges, etc., 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. Also found living inside the bells of cannonball jellies - Stomolophus meleagris.
Atlantic Ocean - North America, Mediterranean, Caribbean

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.