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

• Main Authors: Neal, Lenka, Brasier, Madeleine J., Wiklund, Helena
• Format: Other/Unknown Material
• Language: unknown
• Published: 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Phyllodocida; Polynoidae; Macellicephala; Macellicephala brenesorum; Southern Ocean; Amundsen Sea; Island Bay; Pine Island Bay
• Online Access: https://zenodo.org/record/5994485; https://doi.org/10.5281/zenodo.5994485

Macellicephala brenesorum sp. nov. (Figure 2E and Figure 11, 12; Table 2.) Macellicephala sp. B in Neal et al. (2017) [record]. Material examined. Holotype, NHMUK.2018.830, Pine Island Bay, Amundsen Sea, Southern Ocean, cruise JR 179, station BIO5 -EBS-1A, collected on 09/03/2008, epibenthic sledge epi-net, 74°7' 6''S, 105°50'16 W, 1478 m depth. Description (based on holotype). Medium sized species; holotype complete specimen in a reasonably good condition, 12 mm long, 1.7 mm wide excluding parapodia and 5 mm wide including parapodia, 18 segments (segment 1 = tentacular segment); body dorsoventrally flattened, tapering anteriorly and posteriorly; live specimen not observed; dorsum and everted proboscis purple in alcohol (Fig. 11A), rest of integument pale yellow (Fig. 11B). Prostomium bilobed with moderately wide and deep median notch; prostomial lobes slightly pronounced, anteriorly tapering (Figs. 2E and 11C). Frontal filaments distinct, slender, slightly enlarged basally, distally tapering (Figs. 2E and 11C). Eyes absent. Facial tubercle trilobed, composed of three inflated squarish lobes, with median lobe slightly larger than lateral lobes (Figs. 2E and 11C). Ceratophore of median antenna prominent, elongated, cylindrical, inserted medially on prostomium (near the base of anterior notch) (Figs. 2E and 11C); style of median antenna very long (extending to segment 9), smooth and slender. Palps thick, smooth, tapering into slender tips; relatively short (extending to the beginning of segment 6). Tentaculophores large (Figs. 2E and 11C), cylindrical, equal-sized, inserted laterally to prostomium, achaetous; styles still attached on left side only, long, slender, smooth, similar in form, but shorter in length than style of median antenna (about 3/4 for dorsal tentacular cirrus and ½ for ventral cirrus), dorsal cirrus longer than ventral cirrus. Pharynx everted, with 9 pairs of equal-sized triangular papillae distally (Fig. 11D); two pairs of dark amber coloured jaws with smooth margins. Second segment with ...