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Sampling locations of ribbon worms in Japan. Hiroshima Bay (○), Otsuchi Bay (□) and Akkeshi Bay (Δ) are shown in the map (A); (B) Arrow indicates the ribbon worm Cephalothrix simula adherent to cultured oysters from Hiroshima Bay; scale bar: 10 cm. (C); Cephalothrix simula from Hiroshima Bay with the everted proboscis.
