Notomastus sunae sp. nov., holotype. A MGSP of whole body B anterior end in lateral view C MGSP of transitional segments (chaetigers 9–17) between thorax and abdomen in ventrolateral view D MGSP of transitional segments (chaetigers 7–17) between thorax and abdomen in dorsal view E posterior end in ventrolateral view F posterior segments near pygidium in dorsal view. Abbreviations: cc, capillary chaetae; ch, chaetiger; hh, hooded hooks; neu, neuropodia; no, notopodia; pal, palpode; per, peristomium; prob, proboscis; pyg, pygidium. Scale bars: 1 mm (A); 1 mm (B–E).