Marphysa setiuense sp. nov. Holotype UMTAnn 2177 (A–J). Light microscopy images and digital drawing A anterior end, lateral view B anterior end, dorsal view. Arrows indicate eyes C maxillae, dorsal view D mandibles, dorsal view E unidentate hook, chaetiger 136 F bidentate hooded hook, chaetiger 140 G parapodium, chaetiger 10 H parapodium, chaetiger 77 I parapodium, chaetiger 136 J posterior segments and pygidium, dorsal view. Arrows show the short pair of pygidial cirri. Abbreviations; MI–MV: maxillae I–V, Ac: aciculae, Dc: dorsal cirrus, Vc: ventral cirrus, PCl: prechaetal lobe, Cl: chaetal lobe, PtCl: postchaetal lobe, Sah: subacicular hook, Bf: branchial filament. Scale bars: 1 mm (A, C, D, J); 1 mm (B); 20 µm (E–F); 0.1 mm (G–I).