Red slate pencil urchin (Heterocentrotus mamillatus) on the reef at Hawaii Island

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Red slate pencil urchin (Heterocentrotus mamillatus) on the reef at Hawaii Island

© NOAA Fisheries / Kevin Lino

Red slate pencil urchin (Heterocentrotus mamillatus) on the reef at Hawaii Island photo copyright NOAA Fisheries / Kevin Lino taken at and featuring the Cruising Yacht class

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