Echinoidea Reference Libraries

Slate Pencil Urchin (Heterocentrotus mamillatus), also known as Red Slate Pencil Urchin or Red Pencil Urchin, is a species of sea urchin found in the tropical waters of the Indian and Pacific oceans. It is most abundant off the coast of Hawaii. Specimens found off the coast of Hawaii have bright red spines, more so than others found elsewhere, which generally have yellowish or brown spines....

White Sea Urchin (Echinus acutus), is a species of sea urchin in the Echinidae family. It is found in the Eastern Atlantic Ocean, the Mediterranean Sea, the North Sea and the English Channel at depths up to 330 feet below sea level. It is found mainly on coarse substrates with mud and gravel. The White Sea Urchin grows to a diameter of 6 inches. The test (shell) is circular in cross section...