Dendronotus yrjargul Korshunova & Bakken & GrØtan & Johnson & Lundin & Martynov 2021, sp. nov.

• Main Authors: Korshunova, Tatiana, Bakken, Torkild, GrØtan, Viktor V., Johnson, Kjetil B., Lundin, Kennet, Martynov, Alexander
• Format: Other/Unknown Material
• Language: unknown
• Published: 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Nudibranchia; Dendronotidae; Dendronotus; Dendronotus yrjargul; Bakken; Breivika; Grøtan; Norway; Norwegian Sea; Yrjar; Ørland
• Online Access: https://zenodo.org/record/4623950; https://doi.org/10.5281/zenodo.4623950

Dendronotus yrjargul sp. nov. Figs 1–4, 6, 7 ZooBank: http:// urn:lsid:zoobank.org:act: D44EDB5D-9C27-4D38-A18B-AD6DA5ACE43D Etymology. From Norwegian yrjar (= old name for the type locality in Ørland) and gul (= yellow) meaning “yellow/golden of Ørland” in reference to the remarkable habitus of this species. Type locality. Norwegian Sea, Norway, Ørland. Material examined. Holotype. NTNU-VM- 76306, live length 95 mm (48 mm preserved), Norwegian Sea, mouth of Trondheimsfjord, Ørland, Breivika, 12.03.2018, depth 20–25 m, collector Viktor V. GrØtan. Paratypes with same provenance data: NTNU-VM-76307, 1 specimen, live length 75 mm (40 mm preserved); NTNU-VM-76308, 1 specimen, live length 60 mm (40 mm preserved); paratypes with same provenance data but collected 08.01.2018, depth 20–25 m, collector Viktor V. GrØtan, Kjetil B. Johnson: NTNU-VM-76302, 1 specimen, preserved length 18 mm; NTNU-VM- 76305, 1 specimen, preserved length 17 mm; NTNU-VM-76303, 1 specimen, preserved length 14 mm; NTNU-VM-76304, 1 specimen, preserved length 19 mm; ZMMU Op-718, 1 specimen, preserved length 19 mm. Description. Body elongate, living specimens up to 95 mm in length (fig. 4). Five to six main branched appendages on oral veil. Five appendages on rhinophoral stalks; 18–30 rhinophoral lamellae.Branchedlateralpapillaon rhinophoral sheath present. Seven to eight pairs of dorsolateral appendagespresentin largeadult specimens. Lip papillae 10 to 20. Dorsolateral appendages with relatively short primary stalk, strongly branched secondary branches and elongate tertiary branches (fig. 4A–D). Basal colour is semitransclucent white to greyish, with characteristic two thin wavy subparallel brownish-orange to brownish lines running from the head nearly to the tail. There are no specimens with brownish basal colour. Upper part of the dorsolateral appendages covered with bright golden yellow to yellowish pigment. Foot bordered with thin brownish-orange line. Dorsal processes of jaws inclined posteriorly at approximately 40–48° to the longitudinal ...