Polycirrus dodeka Hutchings, 1990

Glasby, Christopher J. & Hutchings, Pat, 2014, Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae), Zootaxa 3877 (1), pp. 1-117 : 48-51

Polycirrus dodeka Hutchings, 1990

Fig. 24a–d

Polycirrus dodeka Hutchings, 1990: 381–383 , fig. 1a–d.

Type locality. Hong Kong .

Material examined. HOLOTYPE: AM W201884 , Hong Kong, Chek Chau , 22°30' N 114°21' E, coll. 10.iv.1986, under boulders in shallow water.

Description. Holotype, originally complete now with posterior part of body detached, 10 mm long, 1 mm wide anteriorly, for about 65 segments.

Dorsum faintly tessellated anteriorly. Venter with mid-ventral groove from segment 4 and poorly defined ventro-lateral pads, pads deeply incised.

Buccal tentacles numerous, of two types: (1) cylindrical, thickened distally, distinctly grooved and (2) cylindrical, uniformly thin, weakly grooved, both arising at junction between prostomium and upper lip. Prostomial ridge slightly curved, not extending laterally. Upper lip comprising single (medial) lobe only, margin of lobe convoluted; oral surface glandular and ciliated. Inner lower lip oblong, ridged; outer region flat, shield-like, oblong, wider than long, ridged and grooved, extending posteriorly to segment 3. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally ( Fig. 24a ).

Notochaetigerous segments 12, extending to segment 14. Notopodia digitiform, prechaetal lobe low, postchaetal lobe digitiform, slighty longer than prechaetal. Notochaetae within a chaetiger consisting of one type (chaetiger 6 examined), two distinct lengths, strongly hirsute, uniformly tapered, posteriorly same form as those anteriorly ( Fig. 24b ). Neurochaetae begin on segment 14, 5–10 uncini per row. Neuropodial tori erect rectangular pinnules. Uncini with short neck and straight to convex base (Type 1), teeth above main fang arranged in multiple series or arranged in double transverse series ( MF:2:∞), two enlarged median teeth above main fang, subrostral process absent ( Fig. 24c ) .

Nephridial papillae present, spherical, initially very small and difficult to discern. Pre-gular membrane nephridial papillae absent. Post-gular membrane nephridial papillae present, extending from segment 5 to 14; situated at base of notopodia ( Fig. 24d ).

Figures

FIGURE 24. Polycirrus dodeka Hutchings. a. Anterior ventral view. b. Notochaeta. c. Uncinus, lateral view. d. Anterior-mid body, ventral view showing position of nephridia. Scales a, d=1 mm, b, c=0.01 mm. (Redrawn from from Hutchings, 1990).