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4HMEM30: Life in the Sea Member Manual

Figure 59. Long-spined sea urchin. (Diadema spp.). Commonly found clustered in the cavities of coral reefs, this urchin walks on the tips of the shorter spines located on its oral surface. The hollow, needle-like spines are fragile and probably poison-filled. Size: to 1 foot. Range: tropical eastern Atlantic.