Sea Urchin

Diadema antillarum

Sea Urchin

Sea urchins are a diverse group of marine animals known for their spiny, spherical bodies.

Interesting Facts

While they share common features, such as their characteristic five-fold symmetry, there are several fascinating types of sea urchins found in various marine ecosystems. Some have long, venomous spines, like the Long-Spined Sea Urchin, which plays a crucial role in maintaining coral reefs by grazing on algae. Sand dollars, often called flat urchins, have flattened bodies and are closely related to sea urchins. They are found on sandy seabeds and are known for their distinctive coin-like appearance. Collector urchins, with their unique adaptations for gripping onto rocks and shells, use tiny tube feet to collect debris and attach it to their bodies as camouflage. Sea urchins are intriguing not only for their various types but also for their diverse ecological roles in marine ecosystems.

Where can you find me?

There are about 950 species of sea urchin that are distributed on the seabeds of every ocean and inhabit every depth zone from the intertidal seashore down to 5,000 meters

You can often sea urchins hiding amongst the rocks the dive site, The Valley and Achilleas