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Reef Urchin

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description Reef Urchin Overview

The reef urchin is the Caribbean sea urchin species Echinometra viridis in the family Echinometridae. It lives on shallow coral reefs and related hard-bottom habitats, where it grazes on algae and may occupy crevices or recesses in the reef. Its longer spines and dark spine tips help distinguish it from the similar rock-boring urchin Echinometra lucunter, making it relevant to reef surveys and marine identification.

help Reef Urchin FAQ

What species is usually called the reef urchin?

The common name usually refers to Echinometra viridis, a Caribbean sea urchin found on coral reefs from southern Florida toward Venezuela. It is different from Echinometra lucunter, which is commonly called the rock-boring urchin.

What does the reef urchin eat on Caribbean reefs?

It grazes algae from hard reef surfaces, helping keep space available for coral growth. That makes its role similar to other reef herbivores, although the exact diet varies with habitat and food availability.

Where can someone find Echinometra viridis?

Echinometra viridis is associated with shallow Caribbean reef habitat and has been recorded at depths down to about 15 meters. Its range is not the entire Atlantic, so a similar-looking urchin outside the Caribbean may be another Echinometra species.

How can I distinguish a reef urchin from a rock-boring urchin?

The reef urchin is Echinometra viridis, while the rock-boring urchin is Echinometra lucunter. Identification should use spine color, test shape, habitat, and locality together because both can occur in shallow western Atlantic reef environments.

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