Anguillosyllis acsara Maciolek 2020, n. sp.

• Main Author: Maciolek, Nancy J.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Phyllodocida; Syllidae; Anguillosyllis; Anguillosyllis acsara; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.5281366

Anguillosyllis acsara n. sp. Figures 7–8 urn:lsid:zoobank.org:act: AA60704C-9ED0-4EDD-9F70-29C17E76117C Material examined. Western North Atlantic continental slope and rise. (3 specimens in 3 samples from 2 stations). off North Carolina, U.S. South ACSAR Program, coll. J.A. Blake (Battelle), Chief Scientist. Sta. 3, Cruise SA 1, R/ V Columbus Iselin , 15 Nov 1983, Rep. 1, 34°14.13′N, 75°40.41′W, 1505 m, 1 juvenile (NJM). Cruise SA 2, R/V Cape Hatteras , 27 March 1984, Rep. 1, 34°14.51′N, 75°40.33′W, 1523 m, holotype (USNM 1480212). Sta. 12, Cruise SA 4, R/V Cape Hatteras , 22 May 1985, Rep. 1, 33°00.31′N, 76°07.39′W, 1996 m, paratype (USNM 1480213). Description. Body with 11 setigers (Fig. 8A), holotype large, significantly arched dorsally, flat ventrally (Fig. 7A, E; 8 A–B); 2.5 mm long, 0.8 mm wide without parapodia, 1.2 mm wide with parapodia but without setae, other specimens much smaller, up to 1.5 mm long. Palps blunt-tipped, robust ovals, appear free to base on dorsal surface, connected by membrane on ventral surface. Prostomium wider than long, pentagonal; eyes lacking; three clubshaped antennae in nearly transverse row, lateral antennae slightly anterior to medial antenna. Peristomium with two oval tentacular cirri smaller than prostomial antennae; peristomium weakly biannulate, with glandular band across posterior half. Nuchal cilia in large oval patches between prostomium and peristomium. Proventricle in three setigers, barrel-shaped, slightly narrowed at posterior end; ca. 15 muscle rows (Figs. 7C); post-ventricle caeca with dorsal circle of gland cells retaining MB stain (Figs. 7C, 8 A–B). Setigers dorsally biannulate, weakly so on setigers 1 and 5, obscured on setigers 6–10, visible on setiger 11 and pygidium (Figs. 7 A–B, 8A–C); anterior annulation much shorter than posterior, posterior portion of each segment with gland cells scattered across dorsum (Fig. 7A), similar gland cells visible on setiger 11; additional area of dark gland cells at base of parapodia (Fig. 7A); venter biannulate on ...