Fig. 6From: Habitat availability determines distribution patterns of spionid polychaetes (Annelida: Spionidae) around Tokyo BayTubes of spionids protruding from the sponge Hymeniacidon sinapium. a The sponge collected from Kominato with a lot of tubes formed by Boccardiella hamata (overview). b The sponge collected from Chikura and torn to expose a tube formed by Boccardia proboscidea (cross section). Arrow heads indicate spionid tubesBack to article page