Polycirrus swakopianus Augener, 1918

Glasby, Christopher J. & Hutchings, Pat, 2014, Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae), Zootaxa 3877 (1), pp. 1-117 : 102

Polycirrus swakopianus Augener, 1918

Fig. 57a–f

Polycirrus swakopianus Augener, 1918: 563–565 , pl. VII, fig. 228, text fig. XCIV.

Type locality. South West Africa .

Material examined. SYNTYPES: 4, HZM V8733 , 2 , HZM V8802 , South-West Africa ( Deutsch-Südwestafrika, Swakopmund ), Ebbestrand, coll. C. Manger & W. Michaelson, 1911 and Lüderitzbucht, Flachwasser, 0–10 m, coll. W. Michaelson, 1911 .

Description. Syntypes well preserved with body wall intact and chaetae mainly intact, creamy yellow in colour. V-8733 includes four complete individuals of which largest is 150 mm long, 1.5 mm wide excluding buccal tentacles, complete with about 70 segments; smallest 5 mm long and 1.5 mm wide with about 55 segments. V-8802 consists of anterior fragment 4 mm long, 1.2 mm wide for 12 segments (figured) and single complete individual 10 mm long, 1.2 mm wide with about 70 segments. Some individuals gravid.

Dorsum anteriorly smooth. Venter anteriorly with mid-ventral groove and discrete ventro-lateral pads; pads more-or-less smooth, extending from segment 3 to 10. Mid-ventral groove from posterior edge of segment 3.

Buccal tentacles numerous, of one type, cylindrical, uniformly thin and weakly grooved, 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 and ciliated. Inner lower lip oblong, ridged; outer region flat, shield-like, subtriangular and pointing toward mouth, ridged and grooved, extending posteriorly to segment 3. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally ( Fig. 57a ).

Notochaetigerous segments 26, extending to segment 28. Notopodia more-or-less rectangular, swollen, prechaetal lobe low, postchaetal lobe subtriangular, longer than prechaetal ( Fig. 57b ). Notochaetae within a chaetiger consisting of one type (chaetigers 4, 19 examined), two distinct lengths, hirsute, uniformly tapered, posteriorly same form as those anteriorly ( Fig. 57c ). Neurochaetae beginning on segment 7. Neuropodial tori ridgelike, similar along body. Uncini with short neck and straight to convex base (Type 1), teeth above main fang arranged in double transverse series ( MF:1:7–8) enlarged median tooth above main fang present, subrostral process present as low, rounded protuberance ( Fig. 57d–f ) .

Nephridial papillae not visible. Pygidium simple sunken rosette.

Figures

FIGURE 57. Polycirrus swakopianus Augener. Syntypes HZM V8802. a. Anterior ventral view. b. Right side anterior lateral view of notopodium, chaetiger 7. c. Notochaetae from chaetiger 7 illustrated at x40 and x100. d. Lateral view of uncinus from chaetiger 7. e. Lateral and frontal views of uncini from chaetiger 19, f. Lateral and frontal views of uncini from posterior body.