sea hedgehog diadema setosum swimming in coral reefs. a cluster of long-spined sea urchins found near shore. it is distinguished

animal aquarium aquatic background beach beautiful black blue bright closeup color colorful coral dangerous diadema dive echinoderm environment exotic fauna fishtank life long longspine macro marine natural nature ocean poison reef saltwater scuba sea setosum snorkeling spine spined spines spiny tropical undersea underwater uni urchin water wild wildlife