Pseudoscalibregma palmeri Blake, 2015, new species

• Main Author: Blake, James A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Scalibregmatidae; Pseudoscalibregma; Pseudoscalibregma palmeri; Antarctic; Antarctic Peninsula; Weddell Sea; Weddell; Prince Gustav Channel; Lindenberg; Lindenberg Island; Antarc*
• Online Access: https://zenodo.org/record/6102457; https://doi.org/10.5281/zenodo.6102457

Pseudoscalibregma palmeri new species Figures 6 A‒E; 7 Material examined. East Antarctic Peninsula, RVIB Nathaniel B. Palmer Cruise 2000 -03, Collector, J.A. Blake.— Prince Gustav Channel, Sta. NBP-01, 768 m, 1 paratype (LACM Poly 7008).— Weddell Sea, Off Lindenberg Island, Sta. NBP-03, 385 m, holotype (LACM-AHF Poly 7009). Description. Holotype incomplete, 6.2 mm long, 1.5 mm wide for 21 setigerous segments; paratype incomplete, 3.2 mm long, 1.2 mm wide with 16 setigerous segments. Body with weakly expanded thoracic region, narrowing posteriorly. Color in alcohol light tan, with reddish pigmented glands dorsally on setigers 3‒4 and ventrally on setigers 3‒6 (Figs. 6 A‒B); anterior and middle segments with small reddish pigment spots along individual annulae (Figs. 7 A‒B). Body segments with transverse rows of pads; setigers 1‒2 biannulate with large, prominent pads dorsally, not evident ventrally; subsequent setigers quadriannulate with numerous small pads closely spaced, becoming triannulate from about setiger 16. Venter with prominent ventral groove bearing large elevated pads from setiger 2, continuing posteriorly forming ventral ridge line with rounded, elevated pad at midpoint of each segment within groove (Figs. 6 B, 7 B). Branchiae absent; pygidium not present on either specimen. Prostomium with two long, diverging lateral horns directed anterolaterally (Figs. 6 A‒B); eyes absent, nuchal organs not observed; proboscis not everted. Peristomium a single lobed ring around prostomium dorsally (Fig. 6 A), ventrally forming upper and lower lips of mouth; upper lip with 9‒10 narrow lobes; lower lip with about seven large, elongate inflated lobes (Fig. 6 B). Parapodia with elongate conical podial lobes throughout Fig. 7 B–C). Dorsal and ventral cirri from setiger 14, these short, inconspicuous at first, becoming longer and more prominent posteriorly (Fig. 7 C); dorsal cirri triangular, broad basally, tapering to pointed tip (Figs. 7 C‒D); ventral cirri asymmetrical with broad basal attachment and elongated, ...