The Rock-boring Sea Urchin (Echinometra mathaei) is extremely common throughout the Pacific. Using its spines and its toothed lantern (first described by Aristotle, the sea urchin�s mouth is still called �Aristotle�s lantern� by scientists), this urchin bores holes into the rock of the reef.

This sea urchin was photographed in about 35 feet of water off the south Kohala Coast near the Mauna Lani Resort on the Big Island of Hawaii.