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sea urchin of deep black color with nasty thin and long spines
It has been suggested that Diadema setosum populations are temperature-dependent in their spawning seasonalities. Temperatures higher than 25oC have been cited as a possible spawning cue. Equatorial populations are those recorded to spawn at no particular times throughout the entire year. This is true for the Philippine populations of D. setosum.
LOCATION: Be Resorts, Punta Engano, Mactan, Cebu Found these sea urchins stuck on a concrete wall that divides 2 resorts I personally took this photo.