Berkeleyia abyssala Blake, 2017, new species

• Main Author: Blake, James A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Orbiniidae; Berkeleyia; Berkeleyia abyssala; Drake Passage; South Orkney Islands; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.4901735; http://treatment.plazi.org/id/8F2387DD061F0900FF31F9BAFBE5FD2F

Berkeleyia abyssala new species Figures 2 F–G, 3 Haploscoloplos kerguelensis : Hartman 1967 (in part: Sta. 311, 1063). Not McIntosh 1885. Material examined. Drake Passage, Eltanin Sta. 5-311, 3 Nov 1962, 57.98°S, 70.93°W., 3911–4099 m, holotype (USNM 56500); Sta. 5-303, 30 Oct 1962, 62.05°S, 70.92°W, 4077–4176 m, paratype (USNM 69340). — Weddell Sea, Glacier Sta. 69-22, 3111 m (1, USNM 46606); Eltanin Sta. 12-1063, 3495– 3514 m (1, USNM 56524). — Powell Basin, off South Orkney Islands, ANDEEP III ANT XXII- 3, R/ V Polarstern , Sta. PS-67/142-7, 3406 m (1, SEM, JAB); Sta. PS-67/150-8, 1942 m (1, SEM, JAB). Description. All specimens incomplete; holotype 6.5 mm long and 0.7 mm wide for 19 setigerous segments; paratype 6.5 mm long and 0.4 mm wide for 17 setigers; Weddell Sea specimens larger, up to 17 mm long and 0.8 mm wide for 52 setigers. Body cylindrical throughout, not depressed anteriorly; thoracic region widest; abdominal setigers 2–3 times longer than thoracic (Fig. 3 A). Color in alcohol: light tan to opaque white. Prostomium conical, narrowing to pointed tip on anterior margin (Figs. 2 F, 3A); without eyespots; nuchal organs on posterolateral margin of prostomium (Fig. 2 F). Peristomium achaetous, indistinctly separated from prostomium and setiger 1 (Figs. 2 F, 3A). Thorax with 10–11 setigers, all of similar size; digitiform postsetal lobes present from setiger 4 (Fig. 3 A). Abdominal notopodia with long, fingerlike postsetal lobes; neuropodia prolonged, expanded subdistally, with short ventral cirrus (Fig. 3 B). All thoracic parapodia with crenulated capillaries; capillaries with transverse rows of short barbs (Fig. 2 G). Abdominal notopodia with long and short crenulated capillaries and 2–3 furcate setae; furcate setae with subequal tynes connected by row of fine needles and thin webbing, shaft with vertical rows of minute barbs (Fig. 3 C). Abdominal neuropodia with 2–3 short, smooth spines (Fig. 3 D) and 3–6 long, thin, non-crenulated capillaries (Fig. 2 G). Branchiae from setiger 9–10 or next-to-last ...