Echinothrix Reference Libraries

The Diadema Urchin (Echinothrix diadema), is a species of long spined sea urchin found in the Indo-Pacific oceanic region. It prefers dark reef. It is active at night, and hides in crevices or under rocks during the day. This urchin grows to a diameter of about 3.15 inches and is generally black in color and always dark. The spines are banded and closed at the tip. The anal sac is spotted...

The Double-spined Urchin (Echinothrix calamaris), also known as the Banded Sea Urchin, is a species of sea sloth found in the Indian and Pacific oceans. It is usually found on back reefs, hiding in crevices or under rocks. The test (shell) is about 2 inches in diameter. It has two sets of spines, shorter closed spines which are dark in color and can deliver a nasty sting, and longer open...