FIGURE 4 in A novel symbiotic relationship between ascidians and a new tunic-boring polychaete (Annelida: Spionidae: Polydora)

FIGURE 4. Polydora tunicola sp. nov. A: palps and mud tubes of Polydora tunicola sp. nov. protruding from their burrows in the tunics of the sessile ascidian Polycarpa cf. cryptocarpa kroboja. B: closeup of palps and mud tubes of Polydora tunicola sp. nov. C, D: tubes of Polydora tunicola sp. nov. concentrated on near siphons of the ascidians. E: juvenile of Polydora tunicola sp. nov. (arrowhead) constructing a mucous tube on the siphons of the ascidians but not yet bore into the tunic. F: cross-section of a host ascidian showing many pairs of boreholes filled with mud tubes (arrowheads) of Polydora tunicola sp. nov. in the host tunic. Photo by O. Hoshino (A–E) and H. Abe (F).