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Project Noah Nature School
Echinometra mathaei
Purplish and spiny in a rock cave
Reef in haunama bay
It is a rock-boaring urchin, see reference above. Please consider adding this spotting to the Hanauma Bay Marine Life mission at http://www.projectnoah.org/missions/2786...
Spotted on Jul 6, 2013
Submitted on Jul 6, 2013
