Chaetozone hobsonae Blake, 2015, new species

• Main Author: Blake, James A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Cirratulidae; Chaetozone; Chaetozone hobsonae; Arctic; Ridley Island; Alaska
• Online Access: https://doi.org/10.5281/zenodo.5664944; http://treatment.plazi.org/id/9A3E87FEEB7BFFC3D2F7F98EFC2AFF65

Chaetozone hobsonae new species Figures 15‒16 Material examined. Canada, British Columbia, Prince Rupert, off Ridley Island, coll. September 2012, AECOM, by P. Winchell & S. Doner, Van Veen grab: Sta. B05, 19 Sep 2012, 54°12.352ʹN,130°19.966ʹW, 17.7 m, holotype (LACM-AHF Poly 6546), 10 paratypes (LACM-AHF Poly 6547); Sta. B09, 19 Sep 2012, 54°11.698ʹN, 130°18.848ʹW, 7.5 m, 10 paratypes (LACM-AHF Poly 6548); Sta. B23, 20 Sep 2012; 54°11.766ʹN, 130°18.691ʹW, 5.9 m, ca. 200 paratypes (LACM-AHF Poly 6549); Sta. B25, 21 Sep 2012, 54°11.949ʹN, 130°18.672ʹW, 20.1 m, 8 paratypes (LACM-AHF Poly 6550); Sta. B26, 19 Sep 2012, 54°12.070ʹN, 130°18.801ʹW, 12.4 m, 7 paratypes (CMNA 2014- 0 0 17); Sta. B35, 21 Sep 2012, 54°12.281ʹN, 130°18.089ʹW, 26.7 m, 10 paratypes (CMNA 2014- 0018). Southeastern Alaska , Boca de Quadra, Cruise 3BQ, R/V Redoubt , Sta. 100-2, 55°19.2ʹN, 130°29.2ʹW, 95 m, coll. Dec 1979, R.L. Cimberg, Van Veen grab, 6 specimens (LACM-AHF Poly 6551). Description. A moderate-sized species, holotype and larger paratypes 12–13 mm long, 0.6–0.7 mm wide across anterior setigers and ca. 0.8 mm wide in middle setigers, with about 80–85 setigers. Body typically breaks mid-body, hence many specimens incomplete. Color in alcohol light tan to brown, lacking any distinctive body pigment. Body with narrow crowded segments for two-thirds of body; posterior cinctured setigers not as crowded; body without any prominent swelling or anterior enlargement; with narrow, weakly developed mid-dorsal groove from about setiger 6‒8, continuing posteriorly for about first third of body, not apparent posteriorly; venter flattened, with narrow ventral groove from just posterior to mouth continuing over anterior, middle, and most posterior setigers, absent from far posterior cinctured segments. Prostomium swollen, enlarged, tapering to triangular and pointed anterior end (Fig. 15 A–B); eyes absent; nuchal organ a narrow slit bordered by thickened pigmented cells, superficially appearing to be an eye (Fig. 15 B). Peristomium elongate with ...