Doridunculus punkus Moles & Wägele & Uhl & Avila 2016, n. sp.

• Main Authors: Moles, Juan, Wägele, Heike, Uhl, Gabriele, Avila, Conxita
• Format: Other/Unknown Material
• Language: unknown
• Published: 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Nudibranchia; Akiodorididae; Doridunculus; Doridunculus punkus; Weddell; Weddell Sea; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/4563009; https://doi.org/10.5281/zenodo.4563009

D. punkus n. sp. (Figs. 1, 2, 3, 4, and 5) (See 3D PDF of the reconstructed anatomy of the whole specimen and a more detailed anterior part in Supplementary Material 1 and 2, respectively) http://zoobank.org/NomenclaturalActs/ 69A41 F49-FAEC-4A6F-ADD6-0657084A5745. Holotype Adult specimen, 16 mm. Austasen, eastern Weddell Sea (71° 7.15 ′ S, 11° 26.23 ′ W) collected by Agassiz trawl on 29 December 2003, at 228-m depth (PS65/280 – 1). Deposited in SNSB Zoologische Staatssammlung München (catalog number ZSM Moll 2016113). Type locality Austasen, eastern Weddell Sea (Antarctica). External morphology (Figs. 1 and 2a, b) Live animal measured 16 mm (Fig. 1a), when preserved 15 × 6 × 6 mm (length:width:height). Color translucent white, brownish digestive gland seen postero-laterally by transparency. Body high, elongated, pentagonal in transverse section (Fig. 1b); mantle rim protruding; oral veil rounded, slightly folded laterally; oral tentacles grooved; notum rounded posteriorly (Fig. 1c); foot narrow, notched anteriorly, tapering posteriorly, mid-dorsal ridge present in tail (Fig. 1d). Posterior part not covered by notum. Rhinophores bearing seven diagonal lamellae, retractile within smooth cavities. Notum dorsally keeled, starting right in front of rhinophores, extending posteriorly to gills, forming a protuberance tilted toward left side of gills (Fig. 1e); average height of keel about 2 mm. Dorsal notum heterogeneously covered by pointed, conical, spiculated papillae; smaller in notal periphery and at sides of dorsal keel (Fig. 1c). Gills five, shortly pinnate, arranged in semicircle (Fig. 1a, c, f); anal papilla small, placed just behind gills. Genital pore small, situated antero-laterally beneath notum rim. Spicules conspicuous, fusiform, irregularly multiknobbed, sometimes with median crown of knobs (Fig. 2a); densely lying within notum, imparting rough texture, forming dense network toward epidermis (Fig. 2b). Digestive system (Figs. 2c, d, 3, and 4c) Mouth lying ventrally, opening at base of oral veil, right ...