A commensal crab (Lissocarcinus orbicularis) and an emperor shrimp (Periclimenes imperator), living on a leopard sea cucumber (Bohadschia argus), in the waters of the Fiji Islands in the South Pacific Ocean. It is of type echinoderm from family Holothuroidea and has distinctive spots in shape of an eye. The sea cucumber is widely spread in the vicinity of the coral reefs, usually on the shallow sandy bottom and provides food for the crustaceans, in the form of mucus on the skin.