Morphology of Podarkeopsis chinensis sp. nov. A, B, I holotype (XMU-Pol-2021-105) C–G, M paratype 5 (XMU-Pol-2021-203) J paratype 6 (XMU-Pol-2021-204) K paratype 11 (XMU-Pol-2021-213) L paratype 13 (XMU-Pol-2021-215) H, N paratype 12 (XMU-Pol-2021-214) A, B whole worm, dorsal and ventral view C, D anterior end, dorsal view, a dashed rectangular frame in D showing the position of nuchal organs E, F nuchal organs encircled by a dashed line G ring of papillae at the anterior edge of pharynx, inset: an papilla in detail H, I minute teeth on the inner wall of pharynx (white arrows), anterior view J–L minute teeth observed through pressed pharynx wall, dorsal view, inset in J showing enlarged minute tooth M tentacular cirri with most cirrostyles missing, right side, anterior view N chaetiger 1–3, right side, anterior view. Abbreviations: pr, prostomium; mAn, middle antenna; lAn, lateral antenna; pa, palp; no, nuchal organs; pap, papillae; tc, tentacular cirrus; dc, dorsal cirrus; vc, ventral cirrus; cs, cirrostyle; cp, cirrophore. Scale bars: 500 μm (A, B); 200 μm (C, D, G, J–L); 100 μm (E, F, H); 20 μm (insets in G and J).