Notomastus koreanus sp. n. A−C photomicrographs A anterior end in left lateral view (showing methyl green staining reaction, MABIKNA00066311) B chaetigers 9–15 in left lateral view (MABIKNA00066396) C posterior end (MABIKNA00066396) D–G scanning electron micrographs (using additional specimens from type locality) D anterior 6 thoracic segments in left lateral view E capillary chaetae of chaetiger 4 F–G abdominal hooded hooks in frontal view. Abbreviations: cc, capillary chaetae; Ch, chaetiger; genP, genital pore; hh, hooded hooks; lo, lateral organ; mf, main fang; neu, neuropodium; no, notopodium; per, peristomium; pro, prostomium; prob, proboscis; transition, transition between thorax and abdomen.