Macellicephala linseae Neal & Brasier & Wiklund 2018, sp. nov.

• Main Authors: Neal, Lenka, Brasier, Madeleine J., Wiklund, Helena
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Phyllodocida; Polynoidae; Macellicephala; Macellicephala linseae; Amundsen Sea; Southern Ocean
• Online Access: https://doi.org/10.5281/zenodo.5994489; http://treatment.plazi.org/id/03BDA104A33C6941FF64FF3AFB1C26E9

Macellicephala linseae sp. nov. (Figure 2H, Figure 15B, E, F and Figures 16, 17; Table 2.) Macellicephala sp. in Brasier et al. (2016) [record]. Macellicephala sp. A in Neal et al. (2017) [record]. Material examined. Holotype, NHMUK.2018.9354, Amundsen Sea, Southern Ocean, cruise JR 179, station BIO5 - EBS-2A, collected on 09/03/2008, epibenthic sledge epi-net, 73°52'46.704''S, 106°19'6.456''W, 1052 m depth. DNA vouchers (2 specimens): NHMUK.2018.9355, Amundsen Sea, Southern Ocean, cruise JR 179, station BIO5 - EBS-2A, collected on 09/03/2008, epibenthic sledge, epi-net, 73°52'46.704''S, 106°19'6.456''W, 1052 m depth; NHMUK.2018.521, Amundsen Sea, Southern Ocean, cruise JR 179, station BIO5 -EBS-3D, collected on 10/ 03/2008, epibenthic sledge, epi-net, 73°58'40.152''S, 107°25'0.372''W, 550 m. Description (based on holotype). Small to medium sized species; holotype with 18 segments (segment 1 = tentacular segment), 8.5 mm long, 1.3 mm wide excluding parapodia and 2.5 mm wide including parapodia. Live specimens not observed. Preserved specimen creamy yellow in colour (Fig. 16A–C). Prostomium bi-lobed, with a deep anterior notch; prostomial lobes short (not extended), anteriorly rounded (Fig. 16B, Fig. 2H). Frontal filaments absent. Eyes absent. Ceratophore of median antenna large, inserted in anterior notch (Figs. 2H and 16B); style of median antenna missing. Palps very long (extending to segment 9), very slender (only slightly thicker than tentacular cirri), smooth, tapering into slender tips. Tentaculophores inserted laterally to prostomium, of equal size, achaetous (Fig. 2H); only ventral tentacular styles remain attached in holotype, but dorsal styles observed in DNA voucher NHMUK.2 0 18.9355, tentacular styles smooth, very slender and very long (extending to segment 9) (Fig. 16A). Facial tubercle absent. Everted pharynx with 2 pairs of jaws and 9 pairs of small triangular papillae (Fig. 16A); each jaw with single fang and smooth margin. Nine pairs of knob-like elytrophores present on segments 2, 4, 5, 7, 9, ...