Description. Holotype well preserved with body wall intact but most chaetae damaged; body yellowish in colour, 12 mm long and 1.5 mm wide excluding buccal tentacles, complete with approximately 60 segments. Posterior body more compact and muscular than anterior body, sharply tapered near tail end. Sex male. Dorsum anteriorly smooth with thin body wall. Venter with anterior mid-ventral groove from segment 2 (Fig. 6 a) and poorly defined ventro-lateral pads; pads tessellated. Buccal tentacles detached from body, of two types, (1) cylindrical, thickened distally, and distinctly grooved and (2) cylindrical, uniformly thin, and weakly grooved, both types arising at junction between prostomium and upper lip. Prostomial ridge slightly curved, extending laterally. Upper lip trefoiled with lateral, blindly ending, enclosed diverticulae; three lobes similar in size, anterior one subtriangular, lateral ones covered in small tubercles; margin of medial lobe convoluted; oral surface glandular, ciliated, with grooves leading to mouth. Inner lower lip circular (hidden by upper lip), smooth; subconical lobe of outer region protruding above venter, smooth. Achaetous segments visible dorsally but obscured ventrally (Fig. 6 a). Notochaetigerous segments 16, extending to segment 18. Notopodial prechaetal lobe low, postchaetal lobe digitiform, postchaetal lobe longer than prechaetal (Fig. 6 b). Notochaetae within a chaetiger consisting of one type (chaetiger 2 examined), gradually elongating from dorsal to ventral, pinnate (Fig. 6 c). Neurochaetae beginning on segment 17. Neuropodial tori erect pinnules, similar along body. Uncini with long neck and concave base (Type 2), teeth above main fang arranged in single transverse series (MF: 4) enlarged median tooth above main fang present, subrostral process absent (Fig. 6 d, e). Nephridial papillae present, globular, increasing in size posteriorly. Pre-gular membrane nephridial papillae present on segments 3 – 4. Post-gular membrane nephridial papillae present, extending from segments 5 – 16; situated at anterior base of notopodia. Pygidium small, simple, rosette.
Sumber: Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae)