five-limbed echinoderm short, spiny arms star-shaped body disc-like central body small, tube feet on the underside of the arms hard, spiny skin hard skeleton of calcium carbonate plates
starfish which has five-limbed echinoderm starfish which has short, spiny arms starfish which has star-shaped body starfish which has disc-like central body starfish which has small, tube feet on the underside of the arms starfish which has hard, spiny skin starfish which has hard skeleton of calcium carbonate plates