. . . . . . . "purple sea urchins" . . . . . . "Purple sea urchins" . "Purple sea urchin" . . "Strongylocentrotus purpuratus" . . . . . "strongylocentrotus purpuratus" . . . "purple sea urchin" . . . . "sea urchin" . . "California purple sea urchin" . "short-spined purple urchin" . "Strongylocentrotus purpuratus" . . . . . "Strongylocentrotus purpuratus" . . . . . . . . . . . . . . "purple urchins" . . . . . . . . . . "purple urchin" . .