One of the most common organisms in the Caribbean are the sea urchins from the genus Diadema. These sea urchins are facing great threats in the Caribbean. Sea urchin populations are diminishing at increasing rates. Sea urchins are a keystone species and are responsible for fauna growth regulation around the world. They are a very significant part of marine ecosystems that must be maintained and protected. Diadema are found in all tropical areas in the ocean.