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Island Cres, Croatia, Adriatic sea, Mediterranean sea, Aplysina aerophoba, Aplysina, Aplysinidae, Yellow Tube Sponge, Golden Sponge, Sponge, Porifera, Polycitor adriaticus, Polycitor, Polycitoridae, Adriatic ascidian, Colony of Tunicates, Colonial sea squirt, Sea squirt, Ascidiacea, Tunicata, Tunicate, Reef