Echinometra mathaei: The burrowing sea urchins

Inside the crevice, the burrowing sea urchin uses its spines to dig the rocky substrate where it lives. It excavates some limestone, while feeding on encrusting algae. As a result, it produces a deep and long crevice that provides a big enough house for itself. Often, this provides wider space for other animals to live, such as small shrimps, tiny crabs, etc.

The sea urchin (Echinometra mathaei) is hiding in a crevice. This burrower provides more space for other species like crustaceans, mollusks, etc. It is found on reef ecosystem in Triton Bay, Kaimana, West Papua and other reefs in the Indo-Pacific region. It uses its spine to dig rocky substrate where it lives.