Green sea urchin

Several species of sea urchin share the name green sea urchin:


 * Lytechinus variegatus, also known as the variegated sea urchin
 * Psammechinus microtuberculatus, occurs in the Atlantic Ocean, Adriatic Sea, Aegean Sea and Mediterranean
 * Psammechinus miliaris, also known as the shore sea urchin
 * Strongylocentrotus droebachiensis, common in northern waters all around the world