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a) Aggregates of branching coral Montipora digitata are being replaced by the sponge Terpios hoshinota in Ogimi, Okinawa Island. b) Tylostyle spicule with a lobed head and a sharpened end of T. hoshinota. c) T. hoshinota overgrowing M. digitata in Nakijin. Thread tissue (arrow) and a thread reaching a neighboring coral branch (arrowhead).
