Floris van Breugel / Giant Red Sea Urchins (Strongylocentrotus franciscanus) Purple sea urchins (Strongylocentrotus purpuratus) and Sea Anenomes (Anthopleura) underwater, in tide pools along Californian coastline, USA.

Pascal Kobeh / Colony of Red sea urchins (Strongylocentrotus franciscanus) at the feet of Bull kelps (Nereocystis luetkeana) Vancouver Island, British Columbia, Canada. Pacific Ocean.

Franco Banfi / Giant red sea urchin (Strongylocentrotus franciscanus) Vancouver Island, British Columbia, Canada, Pacific Ocean

Pascal Kobeh / Underwater reef covered with a colony of Red sea urchins (Strongylocentrotus franciscanus), Alaska, USA, Gulf of Alaska. Pacific ocean.

Jeff Rotman / Spines and tubed feet of Red sea urchin {Strongylo- centrotus franciscanus} CA, USA

David Hall / Marine invertebrates including Crimson anemones (Cribrinopsis fernaldi), Painted anemones (Urticina crassicornis), Red soft coral (Gersemia rubriformis), Red sea urchins (Strongylocentrotus franciscan...

David Hall / Puget sound king crab (Lopholithodes mandtii) and Red sea urchins (Strongylocentrotus franciscanus), Deserter Group, Queen Charlotte Strait, British Columbia, Canada. September.