Magelona nanseni Mortimer & Kongsrud & Willassen 2022, SP. NOV.

• Main Authors: Mortimer, Kate, Kongsrud, Jon Anders, Willassen, Endre
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Magelonidae; Magelona; Magelona nanseni; Fridtjof Nansen
• Online Access: https://doi.org/10.5281/zenodo.6459434; http://treatment.plazi.org/id/039087DBFFEAFFF8424374FBFAFEFBC4

MAGELONA NANSENI SP. NOV. (FIGS 11, 12) Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org:act: 6F8FA46E-BEBB-48E0-8758-26750FCDA54E. Type locality: Nigeria : 4.1482°N 5.7688°E, 25 m depth. Type material: Holotype, Nigeria : St. 5N–11, af in 75% Etoh (ZMBN132141). Paratypes: Liberia : St. 7LI–01, 1af in 75% Etoh (ZMBN132142); St. 7LI–04, 1af in 75%Etoh (NMW.Z.2021.001.0006); Ghana : St. 2009105–GP1/28, 1af in 75% Etoh (ZMBN107275); St. 2009105–GE1/28, 5af in 75% Etoh (ZMBN107276). Nigeria : St. 5N–11, 1af in 96% Etoh (ZMBN107336, DNA-voucher). Etymology: The new species is named in honour of the zoologist and oceanographer Dr Fridtjof Nansen, whose name is also linked with the research vessel from which all samples from West Africa included in this paper were collected. Diagnosis: Prostomium wider than long, with rudimentary prostomial horns. Chaetigers 1–8 with slender foliaceous notopodial lamellae, with long, superior dorsal lobes and slender, triangular neuropodial lamellae. Lamellae of chaetiger 9 triangular postchaetal in both rami. All thoracic chaetae capillary. Abdominal lateral lamellae basally constricted and spatulate, with pointed tips. Abdominal hooded hooks tridentate, in two groups, vis-à-vis . No pouches observed, pygidium unknown. Description: A stout species; junction between thorax and abdomen noticeable, although not distinctly marked (Figs 11A, 12B), abdomen more rounded than thorax. Holotype, anterior fragment: prostomium 1.0 mm wide, 0.85 mm long; thorax 5.75 mm long (including prostomium), 1.1 mm wide (at its widest point, approximately chaetiger 6); abdomen 0.9 mm wide; total length approximately 13.25 mm for 26 chaetigers. (NB last chaetiger of holotype dissected and slide-mounted. Width measurements not including parapodia.) Thorax tapering towards abdomen from approximately chaetiger 7. Additional anterior fragment (ZMBN107336) 4.8 mm long for 11 chaetigers, approximately 0.8 mm wide. Other anterior fragments 5.5–11.5 mm for 14–20 chaetigers. Prostomium rounded ...