Chaetozone camasetosa Blake, 2015, new species

• Main Author: Blake, James A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Cirratulidae; Chaetozone; Chaetozone camasetosa; Rupert; Prince Rupert; Van Veen; Ridley; Ridley Island; Arctic; Alaska
• Online Access: https://zenodo.org/record/5664946; https://doi.org/10.5281/zenodo.5664946

Chaetozone camasetosa new species Figures 17‒18 Material examined. Southeastern Alaska, Boca de Quadra, Cruise 3 BQ, R/V Redoubt, Sta. 100 -2, 55° 19.2 ʹN, 130 ° 29.2 ʹW, 95 m, coll. Dec 1979, R.L. Cimberg, Van Veen grab, holotype (LACM-AHF Poly 6552), one paratype (LACM-AHF Poly 6553). Prince Rupert, British Columbia, off Ridley Island, coll. September 2012, AECOM by P. Winchell & S. Doner, few specimens mixed with C. hobsonae n. sp., mostly incomplete, 12‒20 m (JAB). Description. A moderate-sized species, holotype complete, 6.0 mm long, 0.4 mm wide for 65 setigerous segments; paratype in two pieces, 10.5 mm long, 0.5 mm wide for 64 setigerous segments; Prince Rupert specimens small, mostly incomplete. Color in alcohol light tan to brown, lacking any distinctive body pigment. Body generally thick, with narrow segments throughout, middle body segments widest; last 12‒15 setigers formed into distinct cinctures with high membranes bearing spines. Dorsum rounded, with narrow and shallow dorsal groove apparent from about setiger 20, continuing along body until cinctured posterior segments; venter somewhat flattened, with well-developed ventral groove present from about setiger 20, continuing through middle body segments, not apparent posteriorly. Prostomium swollen posteriorly, narrowing anteriorly to triangular, blunted margin (Fig. 17 A); eyes absent; small slit-like nuchal organ present, not pigmented; peristomium with three nearly equal rings, merging with posterior margin of prostomium (Fig. 17 A); achaetous segment absent; dorsal tentacles arising from posterior margin of posterior ring; first pair of branchiae lateral and slightly posterior to tentacles on anterior margin of setiger 1 (Fig. 17 A); second pair of branchiae on posterior edge of setiger 1, dorsal to notosetae; subsequent setigers with branchiae in similar location. Setiger 1 of approximately same size as last peristomial annulation and following segments; podial lobes reduced to inconspicuous ridges in anterior setigers; inflated and ...