Polycirrus antarcticus

• Main Authors: Glasby, Christopher J., Hutchings, Pat
• Format: Other/Unknown Material
• Language: unknown
• Published: 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Terebellidae; Polycirrus; Polycirrus antarcticus; Adare; Cape Adare; Charcot; Charcot Port; Gravier; Port Charcot; Antarc*; Antarctica; antarcticus
• Online Access: https://zenodo.org/record/4948562; https://doi.org/10.5281/zenodo.4948562

Polycirrus antarcticus (Willey, 1902) Fig. 5a–e Ereutho antarcticus Willey, 1902: 281, Pl. XLII., fig. 6, pl.XLVI, fig. 6. Polycirrus insignis Gravier, 1907: 54–56, figs 35, 36. New synonym. Type locality. Antarctica, Cape Adare. Material examined. HOLOTYPE: Antarctica, Cape Adare, coll. 25.i.1900, washed up after a gale, BMNH 1902:1.8.18, 71°17′ S, 170°14′ E. HOLOTYPE: Polycirrus insignis A 229, MNHN 1542, Expedition Charcot, Port Charcot, 40 m, coll. 1903–1905, id. 1906, 66°15'S 135°55'E. Description. Based on holotypes of E. antarcticus and P. insignis. Holotype of E. antarcticus incomplete, 23 chaetigers, 15 mm long, 2.5 mm wide; mature female (from Willey 1902); original description does not mention any damage but some body wall damage now present. Holotype of P. insignis complete, 36 chaetigers, 25 mm long (Fig. 5a, b). Venter with anterior mid-ventral groove and discrete ventro-lateral pads; pads more-or-less smooth, extending from segment 3 to 10; mid-ventral groove from segment 4 (Fig. 5c). Buccal tentacles of one type (most are missing), cylindrical, uniformly thin and weakly grooved. Prostomial ridge slightly curved, not extending laterally. Upper lip trefoiled with lateral blindly ending enclosed diverticulae (lateral lobes not as large as medial lobe), margin of medial lobe convoluted; oral surface glandular and ciliated. Inner lower lip oblong; outer region flat, shield-like, oblong, wider than long, tessellated, extending posteriorly to segment 3. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally (Fig. 5c, d). Notochaetigerous segments 11 (10 on one side), extending to segment 13. Notopodia digitiform, lobes both similar, low and rounded (Fig. 5c). Notochaetae within a chaetiger consisting of one type (chaetigers 5 and 10 examined; most chaetae damaged), of two distinct lengths, smooth, narrowly winged (some hirsute at tip as a result of wear), subdistally slightly expanded), posteriorly same form as those anteriorly with blades more striated (Fig. 5e); ...