Daylithos langkawiensis sp. nov. Holotype (USMCRC-Pol001). A. Whole body, lateral view; B. Anterior end, lateral view; C. Prostomium, lateral view, covered by branchial plate; D. Prostomium, frontal view; E. Notochaetae, chaetiger 12; F. Distal part of notochaetae; G. Basal part of notochaetae; H. Neurohook, chaetiger 12; I. Middle part of neurohook. 5 mm (A, B); 1 mm (C, D); 200 μm (E); 100 μm (F); 200 μm (G); 100 μm (H); 50 μm (I). Abbreviations: bp, branchial plate; br, branchiae; p, palp; dl, dorsal lip; ll, lateral lip.