Notomastus koreanus sp. n. A anterior end, left lateral view (MABIKNA00146048) B same, dorsal view (MABIKNA00146048) C posterior abdominal segments, left lateral view (Holotype, MABIKNA00066337) D posterior end, left lateral view (Holotype, MABIKNA00066337). Abbreviations: cc, capillary chaetae; gp, genital pore; hh, hooded hooks; lo, lateral organ; neu, neuropodium; no, notopodium; pro, prostomium; prob, proboscis; per, peristomium; transition, transition between thorax and abdomen.