Terebellides bigeniculatus Parapar, Moreira & Helgason, 2011, sp. nov.

• Main Authors: Parapar, Julio, Moreira, Juan, Helgason, Gudmundur V.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Trichobranchidae; Terebellides; Terebellides bigeniculatus; Iceland
• Online Access: https://doi.org/10.5281/zenodo.5667029; http://treatment.plazi.org/id/8F4F706BFFCDEC43FF410F2F9C62FEC9

Terebellides bigeniculatus sp. nov. Figures 1 b, 4−7, 13b Material examined. A total of 181 specimens (5.66% of total) were obtained in 50 BIOICE samples. Type material. Icelandic Museum of Natural History: BIOICE sample 2591 (Holotype IMNH 24923 and six paratypes IMNH 24924; 67º12'53''N; 22º25'46''W; 333 m depth); BIOICE sample 2047 (five paratypes IMNH 24925; 65º42'09''N; 12º52'60'' 272 m); BIOICE sample 2619 (three paratypes in two SEM stubs IMNH 24929 and IMNH 24930; 67º16'86''N; 16º37'77''W, 600 m). BIOICE sample 2868 (three paratypes IMNH 24926; 64º40'94''N; 25º35'82''W, 212 m). Museo Nacional de Ciencias Naturales de Madrid: BIOICE sample 2591 (26 paratypes; MNCN 16.01/13606) Non-type material . Icelandic Museum of Natural History: BIOICE sample 2021 (1 specimen); 2046 (3); 2047 (11); 2049 (4); 2087 (1); 2119 (3); 2124 (2); 2136 (2); 2143 (1); 2229 (1); 2241 (1); 2268 (2); 2273 (1); 2282 (1); 2303 (3); 2330 (1); 2362 (2); 2371 (2); 2427 (1); 2469 (1); 2528 (1); 2573 (4); 2583 (1); 2585 (1); 2612 (5); 2613 (16); 2618 (1); 2619 (9); 2627 (1); 2666 (3); 2673 (4); 2717 (1); 2741 (4); 2789 (1); 2887 (2); 2901 (5); 2979 (2); 2983 (1); 3023 (3); 3026 (5); 3099 (1); 3110 (1); 3247 (1); 3252 (7); 3550 (1); 3558 (1); 3588 (14). Additional material examined. Zoologisches Institut und Zoologisches Museum, Universität Hamburg. Type material of Terebellides biaciculata P–20709. Type locality. Off North-West Iceland (333 m deep). Occurrence. Terebellides bigeniculatus sp. nov. is present at both sides of the GIF Ridge, but shows the narrowest depth range when compared to the other species, not reaching depths greater than 1000 m (Fig. 1 b). Depth range: 179-968 m; temperature range: -0.6 to 5.6ºC. Description based on holotype. Complete specimens range from 10 to 24 mm in length (22 mm in holotype) and 1.0 to 2.0 mm in width (2.0 mm in holotype) (Fig. 4); body tapering posteriorly with segments increasingly shorter and crowded towards pygidium. Prostomium compact; tentacular membrane surrounding the mouth and provided ...