Slate Pencil Urchin (Heterocentrotus mamillatus) パイプウニ – size 25
The Slate Pencil Urchin is found in surge zones that are exposed to a lot of surf. They use the long spines to wedge themselves into the bottom. Amami 2019
Slate Pencil Urchins are common in Hawaii. They have a lot of variation in the colors of the spines. From bright red to brown and solid color to banded. The short spines can be white or red. Kauai 2013
Slate Pencil Urchin near the waves. Kauai 2020