Field view of collection sites, aggregation, tubes of Spirobranchus akitsushima sp. nov. A, B Wakaejima, Kamakura C–E Hayama, Sagami Bay F, G Tsurugizaki, Miura Peninsula H–J Nojima, Yokohama. Aggregation of Yokohama found on concrete wall (I), around mean-sea level, thickness ~ 3–5 cm (H, J) K–O tubes of Kamakura population P, Q Ogasawara specimens. Scale bars: 1 mm (K, L, M, N, O, P), 2 mm (Q).