Laonice (Sarsiana) alberti Sikorski, Langeneck & Pavlova 2021, sp. nov.

• Main Authors: Sikorski, Andrey V., Pavlova, Lyudmila V., Sardá, Rafael, Langeneck, Joachim, Gil, João, Ravara, Ascensão
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Spionida; Spionidae; Laonice; Laonice alberti; Alberti; Northeast Atlantic
• Online Access: https://zenodo.org/record/4455620; https://doi.org/10.5281/zenodo.4455620

Laonice (Sarsiana) alberti Sikorski, Langeneck & Pavlova sp. nov. (Figures 1, 2 A–H, 4) LSID: urn:lsid:zoobank.org:act: 4D214346-F738-43B2-AEE0-A6D82B53EDA8 Laonice sp.— Langeneck et al. 2017: 143. Laonice (Sarsiana) sp. A—Langeneck et al. 2019: 87. Material examined. Holotype (MOM INV-0022694) and paratype (MOM INV-0022695): Malta Escarpment, Central Mediterranean Sea, R / V Urania, Project BIOFUN, St. 1, 36.5310°N 15.4340°E, 1200 m, 8– 19.05.2009. Paratype (MNCN 16.01 /18547): Balearic slope, NW Mediterranean Sea, R / V Urania, Project BIOFUN, St. 28 B 2400, 38.9433°N 3.6469°E, 2346 m, clayish silt, 07.05.2010. Paratype (DBUA0002347.01): open slope of Blanes submarine canyon, NW Mediterranean Sea, R / V Garca del Cid, Project DOS MARES, Cruise DM3, trawl code DM3 P2, 41.5055N 02.8500E, 1200 m, 10.10.2012. Additional non type material, possibly belonging to the same species (DBUA0002235.03): Mercator mud volcano, Gulf of Cadiz, off Morocco, Northeast Atlantic Ocean, R / V Maria S. Merian, MSM 01-03, St. 242, 35.2978ºN 6.6468ºW, 350 m, 06.05.2006. Description. All specimens incomplete (50 chaetigers in holotype), consisting of anterior fragments 0.8–0.9 mm wide. Prostomium longer than wide, triangular (holotype) to bell-shaped (paratype MOM INV-0022695), with very small apical incision (Figs 1 and 2A); antero-lateral corners connecting to peristomium by very thin and nearly inconspicuous ventral folds hidden in the groove between prostomium and peristomium (Figs 1 and 2B). Prostomium narrowing backwards at first gradually until the fore level of the first pair of parapodia, and then abruptly, merging posteriorly with the caruncle. One pair of faint eyespots (paratype MOM INV-0022695). Occipital antenna very short, erect and finger-like, inserted at the end of the prostomium, just at the rear level of the first pair of parapodia. Palps lost from all specimens. Nuchal organs as double U-shaped ciliary bands extending posteriorly to chaetigers 5–7 (Fig. 2A). Body width uniform along its length. Branchiae from ...