Pale Rock Boring Urchin (Echinometra mathaei) ナガウニ
The Pale Rock Boring Urchin is very common and in shallow areas were there is wave action. Due to feeding and wedging they bore into the rocks. Amami 2018
A younger rock boring urchin lacks the white tips of the spines. The color varies from pink to olive like the one above. Amami 2019