Life (root) » Animalia (Animals) » Echinodermata (Echinoderms) » Echinozoa (sea urchins and sea cucumbers) » Echinoidea (Sea Urchins, Sand Dollars, and Heart Urchins) » Euechinoidea (sea urchins) » Carinacea » Echinacea » Camarodonta » Echinidea » Odontophora » Strongylocentrotidae » Strongylocentrotus » Strongylocentrotus droebachiensis (Green Sea Urchin)