Echinothrix Calamaris Collection

Anal sack of a double spined urchin (Echinothrix calamaris). Photographed in Manokwari, West Papua in Indonesia, Asia

Banded Sea Urchin (Echinothrix calamaris); Maui, Hawaii, United States of America

Banded Sea Urchin, Hawaii, USA
This is a young banded sea urchin (Echinothrix calamaris), still has its balloon-like anal sac which is usually absent in adults due to a parasitic crab

Banded sea urchin (Echinothrix calamaris). The sea urchin is an echinoderm, a relative of the star fish. Its exoskeleton shell, or test, is covered in spines that protect it from predators

Banded sea urchin on a reef
Banded sea urchin (Echinothrix calamaris, centre) on a reef. Photographed off Rinca island, Komodo National Park, Indonesia

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Discover the fascinating world of Echinothrix calamaris, the Banded Sea Urchin, also known as the "Anal Sack Urchin" or "Double-Spined Urchin." This intriguing marine creature is native to the Indo-Pacific region, including Hawaii, USA, and the South Sulawesi Province in Indonesia's Wakatobi Archipelago Marine Preserve. The Banded Sea Urchin is easily recognizable with its distinctive black and white bands and two pairs of spines. These spines not only protect the urchin from predators but also provide shelter for various crustaceans, such as the Urchin Crab, which makes its home in the urchin's spines. These urchins play a crucial role in maintaining the health of their reef ecosystems by feeding on algae, keeping the balance between algae growth and coral health. Witnessing these fascinating creatures in their natural habitat is a must-see experience for any marine enthusiast.