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Echinoderms-"spiny skin"-represent an important group of invertebrates in Sanctuary waters. The purple and red sea urchins (Stongylocentrotus purpuratus, S, fransicianus, respectively) and the blood and six-rayed sea stars (Henricia liviula and Leptaserias hexactis) all have tube feet. Urchins feed on algae. Sea stars are predators of smaller invertebrates. (photo: Nancy Sefton)

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