Rhynchospio aciliata sp. nov. A–E paratype (NIBRIV0000893853) F holotype (NIBRIV0000893855) A, B live specimen in seawater, dorsal view (A) and lateral view of anterior end (B) C neuropodial chaetae in chaetiger 35, anterior-row chaeta with heavy granulations (a) and posterior-row chaeta without granulation (b) D ventral sabre chaetae in chaetiger 35 E neuropodial hooded hooks in chaetiger 31 F whole body, removed palps, fixed in formalin. Scale bars: 0.5 mm (A, B); 20 μm (C–E); 2 mm (F).