Kirkegaardia kladara Blake, 2016, new species

• Main Author: Blake, James A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Ctenodrilidae; Kirkegaardia; Kirkegaardia kladara; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.5612214; http://treatment.plazi.org/id/277D879E2E6B895B05E129E7FAA02EFC

Kirkegaardia kladara new species Figures 10 D, 11 Tharyx sp. 4: Blake et al. 1987: C-2; Hilbig 1994: 941. Material examined. Western North Atlantic, off Cape Lookout, North Carolina , U.S. South Atlantic ACSAR Program Cruise 1, R/ V Columbus Iselin Sta. 1, Rep. 2, 11 November 1983, 34°16.36′N, 75°45.50′W, 640 m, coll. J.A. Blake, Chief Scientist, holotype (USNM 1407164); Cruise 2, R/V Cape Hatteras , Sta. 2, Rep. 3, 27 March 1984, 34°14.56′N, 75°43.35′W, 1000 m, coll. J.A. Blake, Chief Scientist, 1 paratype (USNM 1407165). Description. An elongate, thin, fragile species; holotype complete, 24 mm long, 0.3 mm wide with about 95 setigers; paratype incomplete, 4.36 mm long, 0.23 mm wide across thorax, for 19 setigers. Body of holotype covered with closely adhering silt particles. Color in alcohol, light tan with no pigment. Pre-setigerous region 1.8x as long as wide. Prostomium narrow, rounded on anterior margin, continuing as a narrow peristomial ridge or dorsal crest to anterior border of setiger 1 (Fig. 11 A); eyes absent; nuchal organs not observed. Peristomium elongate, narrow, about 1.6x as long as wide; smooth, without obvious annulations (Fig. 11 A). Dorsal tentacles arising on posterior part of peristomium with first pair of branchiae posterior to tentacles on setiger 1 at posterior margin overlying mid-dorsal groove (Fig. 11 A). Subsequent branchiae in same position on following thoracic setigers. Branchiae of thoracic segments dorsal and posterior to notosetae at border with middorsal channel; thereafter, parapodia shifting to lateral position in abdominal segments (Fig. 11 B–C); branchiae not observed in far posterior segments. Thoracic region with 7–9 setigerous segments, each about 3x as wide as long (Fig. 11 A); abdominal segments increasing in length and decreasing in width to about 2.5x as long as wide, each more or less cylindrical with parapodia at posterior end (Fig. 11 B); thoracic parapodia dorsally elevated over mid-dorsal surface forming shallow dorsal groove extending from end of ...