Polycirrus multisetigerus Hartmann-Schröder, 1962

Fig. 40a–f

Polycirrus multisetigerus Hartmann-Schröder, 1962: 158–160, figs 207–210.

Type locality. Isla James, Chile.

Material examined. HOLOTYPE: HZM P15172, Chile, Isla James, Puerto Lagunas, 54°56ʹ S, 67°37ʹ W, intertidal, in the holdfasts of Macroystis pyrifera. coll. 12.viii.1953 by Stuardo.

Description. Holotype pinkish brown in colour, 15 mm long, 1.3 mm wide excluding buccal tentacles, incomplete with approximately 70 segments. Sex unknown. Type well preserved except that body wall damaged at chaetiger 10 on one side of the body, chaetae mainly intact.

Dorsum anteriorly tessellated. Venter anteriorly with mid-ventral groove and discrete ventro-lateral pads; pads extending from segment 2 to 11, incised with deep transverse grooves. Mid-ventral groove from segment 3 (Fig. 40a).

Buccal tentacles numerous, of two types: (1) cylindrical, thickened distally and distinctly grooved and (2) cylindrical, uniformly thin and weakly grooved, some shorter than others, both arising at junction between prostomium and upper lip. Prostomial ridge distinctly curved, extending laterally along anterodorsal base of upper lip. Upper lip trefoiled, small wing-like lobes laterally, margin of medial lobe convoluted; oral surface glandular, ciliated, with grooves leading to mouth. Inner lower lip oblong, smooth; outer region flat, shield-like, subtriangular and pointing towards mouth, tessellated, extending posteriorly to segment 3. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally (Fig. 40a).

Notochaetigerous segments 48, extending to segment 50. Notopodia more-or-less rectangular, lobes triangular, postchaetal lobe longer than prechaetal, especially in anterior notopodia (Fig. 40b). Notochaetae within a chaetiger consisting of two types (chaetigers 4, 14 examined), smooth, narrowly winged, wings appearing striated under high power, subdistally expanded, posteriorly same form as those anteriorly; secondary notochaetae in all chaetigers pinnate (Fig. 40c, d). Neurochaetae beginning on segment 8. Neuropodial tori ridge-like, similar along body. Uncini with short neck and straight to convex base (Type 1), teeth above main fang arranged in double transverse series (MF:1:∞) enlarged median tooth above main fang present, subrostral process absent (Fig. 40e, f).

Nephridial papillae present, spherical. Pre-gular membrane nephridial papillae absent. Post-gular membrane nephridial papillae present, extending from segment 5 to 8.