gracilechinus acutus is a species of sea urchin in the family echinidae, commonly known as the white sea urchin

150 act acutus adult against algae ambulacral appear area around biology black brown color commonly contain defense diameter echinidae family feeds gracilechinus green grow having holiday instead invertebrates isolated known life long marine mechanism more mouth occasional omnivore one pedicellariae plates predators primary red reddish sea secondary short small species spines stage stripes tapered thin two types urchin urchins usually vacation vertical while white with