Polycirrus glaucus Hutchings, 1993

Glasby, Christopher J. & Hutchings, Pat, 2014, Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae), Zootaxa 3877 (1), pp. 1-117 : 56-58

Polycirrus glaucus Hutchings, 1993

Fig. 28a–c

Polycirrus glaucus Hutchings, 1993: 322–323 , fig. 1a–c.

Type locality. Rottnest Island , Western Australia .

Material examined. HOLOTYPE: AM W20937, Australia, Western Australia, Rottnest Island, Roe reef, 32°1ʹ12.42ʺ S, 115°29ʹ43.83ʺ E, 30 m.

Description. Holotype complete, 12 mm long and 1.5 mm wide with about 65 segments.

Dorsum anteriorly smooth. Venter anteriorly with mid-ventral groove and discrete ventro-lateral pads; pads incised (tessellated), extending from segment 3 to 7. Mid-ventral groove from segment 3 ( Fig. 28a ). Sex male.

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, extending laterally along anterodorsal base of upper lip. Upper lip trefoiled with lateral, blindly ending, enclosed diverticulae, margin of medial lobe straight; oral surface glandular, ciliated, with grooves leading to mouth. Inner lower lip oblong with raised margin, smooth; outer region subconical lobe protruding above venter, weakly tessellated, extending posteriorly to anterior edge of segment 3. Achaetous segments visible dorsally but obscured ventrally ( Fig. 28a ).

Notochaetigerous segments 11, extending to segment 13. Notopodia digitiform, anterior ones more elongate than posterior ones, tips of podia swollen, prechaetal lobe low, postchaetal lobe digitiform, longer than prechaetal. Notochaetae within a chaetiger consisting of one type, gradually elongating from dorsal to ventral, pinnate, posteriorly same form as those anteriorly ( Fig. 28c ). Neurochaetae beginning on segment 14 (first segment after last notopodial segment). Neuropodial tori erect rectangular pinnules, posteriorly pinnules becoming more erect with notopodial cirrus. Uncini with long neck and weakly concave base (Type 2), teeth above main fang arranged in double transverse series (MF:2:3), subrostral process absent ( Fig. 28b ).

Nephridial papillae present, spherical. Pre-gular membrane nephridial papillae absent. Post-gular membrane nephridial papillae present, extending from segment 5 to 13; situated at anterior base of notopodia. Pygidium smooth ring.

Figures

FIGURE 28. Polycirrus glaucus Hutchings. Anterior end, ventral view. b. Mid-body uncinus. c. Shaft of notochaeta. Scales: a=1 mm, b, c=0.04 mm. (Redrawn from Hutchings, 1993).