Pelagic Red Crab

Found on the seabed, in warm waters, of the continental shelf. Often swarms of these crabs are found washed up on shorelines.
Eastern Pacific - California to Chile

Anomura crabs are considered false crabs, they have a longer abdomen and the back legs are modified or reduced so hardly noticeable.
These crabs include the hermit crabs and squat lobsters.
Many thousands of species live worldwide in sea water, fresh water and on land.