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The long-spined sea urchin, Diadema antillarum, has extremely long, fragile spines that may measure as much as 4 times the diameter of the test. Spines are hollow and contain venom which causes a painful sting. The overall size of long-spined sea urchins may be as much as 20 inches, though test diameter is seldom more than 4 inches. Typical body color is black, but lighter shades of gray, and even white, are observed.
The Caves, Norman Island, BVI.