stunning closeup of a black longspined sea urchin diadema setosum displaying intricate spines in vibrant underwater

black longspined sea urchin diadema setosum echinoderm marine life underwater wildlife spiny ocean animal creature invertebrate biology seabed floor spines texture closeup vibrant colors natural lighting nature world echinoid diadematidae ecosystem biodiversity habitat deep tropical anatomy dark long detail scene environment fauna reef oceanography echinodermata