, the coral Parazoanthus axinellae grows on the sponge Axinella. The organisms that live in the cavities of sponges include crustaceans, nematode and polychaete worms, ophiuroid echinoderms (brittle stars), and bivalve mollusks; some inhabit a sponge for occasional shelter or nourishment, others establish more intimate associations as parasites…
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