sea urchin
spiny exterior round, dome-shaped body short, spindly legs small, central mouth tube feet used for movement hard, stony external skeleton (test) variably colored, from black to purple to brown
sea urchin which has spiny exterior sea urchin which has round, dome-shaped body sea urchin which has short, spindly legs sea urchin which has small, central mouth sea urchin which has tube feet used for movement sea urchin which has hard, stony external skeleton (test) sea urchin which has variably colored, from black to purple to brown