Polycirrus paucidens Hutchings & Glasby, 1986

Glasby, Christopher J. & Hutchings, Pat, 2014, Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae), Zootaxa 3877 (1), pp. 1-117 : 89

Polycirrus paucidens Hutchings & Glasby, 1986

Fig. 48a–g , Table 1

Polycirrus paucidens Hutchings & Glasby, 1986: 341 , fig. 9f–l; 12D.

Type locality. Bass Strait , Australia .

Material examined. HOLOTYPE: MV F50348 , Australia, south western Bass Strait , 40°30ʹ57ʺ S, 144°56' E, 60 m.

Description. Holotype complete, 10.2 mm long, 1.2 mm wide, with about 50 segments.

Dorsum anteriorly heavily papillose. Venter anteriorly with mid-ventral groove from segment 3 and discrete ventro-lateral pads flat and not well defined; pads deeply incised with many small corrugations, extending from segment 3 to 9 ( Fig. 48a ).

Buccal tentacles numerous, 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, not extending laterally. Upper lip with prominent medial lobe, small wing-like lateral lobes, margin of medial lobe straight; oral surface glandular and ciliated. Inner lower lip not visible; outer lower lip small, flat, shield-like, oblong, wider than long, smooth. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally ( Fig. 48a, b ).

Notochaetigerous segments 7–9, extending to segments 9–11. Notopodia digitiform, prechaetal lobe low, postchaetal lobe broadly digitiform, postchaetal lobe longer than prechaetal ( Fig. 48c ). Notochaetae within a chaetiger consisting of one type, gradually elongating from dorsal to ventral, smooth, narrowly winged, uniformly tapered, posteriorly same form as those anteriorly ( Fig. 48d ). Neurochaetae beginning on segment 13–17, 8–22 uncini per row. Neuropodial tori erect rectangular pinnules, similar along body. Uncini with long neck and slightly concave base (Type 2) (based on morphometric study, although appear somewhat intermediate), main fang unusually blunt, teeth above main fang arranged in single transverse series (MF:1–5) enlarged median tooth above main fang present, subrostral process absent ( Fig. 48e–g ).

Nephridial papillae not visible.

Figures

FIGURE 48. Polycirrus paucidens Hutchings & Glasby. a. Ventral view of head end. b. Lateral view of head end. c. Anterior view of notopodium, chaetiger 3, left side. d. Notochaeta from anterior view of notopodium, chaetiger 3, left side. e, f. Lateral views of uncini from mid-bodyand posterior body respectively. g. Frontal views of uncini from mid-posterior body. Scales a, b=1 mm, d, e, f, g=0.01 mm, c=0.05 mm. (Reproduced with permission from Hutchings & Glasby, 1986; http:// www.australianmuseum.net.au/Uploads/Journals/17666/185_complete.pdf).