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Black Diadema Sea Urchin (Diadema antillarum), Mu Ko Lanta Marine National Park, Thailand
The Black Sea Urchin is characterized by its exceptionally long black spines.
It is an important herbivore on the coral reefs. When the population of these sea urchins is at a healthy level, they are the main grazers which prevent algae overgrowth of the reef.