The giant barrel sponge is the largest species of sponge found growing on Caribbean coral reefs.

It is common at depths greater than 10 meters (33 ft) down to 120 meters (390 ft) and can reach a diameter of 1.8 meters (6 feet).

The giant barrel sponge has been called the "redwood of the reef" because of its size and estimated lifespan of hundreds to a thousand or more years.