Dendronotus robilliardi Korshunova, Sanamyan, Zimina, Fletcher & Martynov, 2016

Korshunova, Tatiana, Bakken, Torkild, GrØtan, Viktor V., Johnson, Kjetil B., Lundin, Kennet & Martynov, Alexander, 2021, A synoptic review of the family Dendronotidae (Mollusca: Nudibranchia): a multilevel organismal diversity approach, Contributions to Zoology 90 (1), pp. 93-153 : 127-128

Dendronotus robilliardi Korshunova, Sanamyan, Zimina, Fletcher & Martynov, 2016

Fig. 7

Dendronotus robilliardi Korshunova, Sanamyan, Zimina, Fletcher & Martynov, 2016: 28–32 , Figs 2 , 3 , 5 .

Extendeddiagnosis. Body narrow. Fivetoeight pairs (commonly more than six) of branched dorsolateral appendages, digestive gland penetrates at least three pairs of dorolateral appendages. Four to six appendages of oral veil. Four to six appendages of rhinophoral stalks. Lateral papilla of rhinophoral sheaths present. Rhinophoreswith 11–15 lamellae. Five to ten lip papillae. Basal colour white, dorsolateral appendage variable opaque orange or opaque white, including tip. Dorsal processes of jaws inclined posteriorly at approximately 50–60° to the longitudinal axis of the jaw body and 0.43–0.45 of its length. Radula with up to 43 rows of teeth. Masticatory processes with ridge-like structures and smaller denticles. Central tooth with up to 17 small, distinct denticles without furrows. Up to nine lateral teeth with upto eight denticles. Ampulla is hook-shaped to swollen kidney-shaped, with various degrees of folding. Bursa copulatrix large, rounded, withsmallseminalreceptaculum placed distally at a short distance from the vaginal opening. Prostate discoid with about 19–30 alveolar glands. The vas deferens is short, penis relatively short, curved. Body length up to 35 mm.

Distribution. NW (from South Korea to Commander Islands) and NE Pacific (from Alaska to at least Washington State, Canada

and USA). Northern Japan (photographic record only, Korshunova et al., 2019b).

Depth. circa 5– 30 m.

Remarks. See Remarks for D. albus .

Figures

FIGURE 2 Phylogenetic relationships of the species of the genera Dendronotus, Pseudobornella and Cabangus in single COI, 16S, 28S, and H3 gene trees inferred by Bayesian Inference (BI). Some branches are collapsed. Positions the Pseudobornella orientalis highlighted green; positions the Cabangus regius highlighted orange.Numbers represent posterior probabilities from BI. PHOTOGRAPHS BY A. MARTYNOV AND T. KORSHUNOVA

FIGURE 3 A.Map of the Northern Hemisphere showing the distribution of D.elegans (including “D.niveus”), D.kalikal, and D.yrjargul sp. nov.The type locality of D.elegans is indicated by crossed lines. B. The haplotype networks based on cytochrome c oxidase subunit I (COI), 16S rRNA (16S), and 28S rRNA (28S) molecular data showing genetic mutations occurring within D.elegans (“D.niveus”), D. kalikal, and D.yrjargul sp. nov. specimens.Abbreviations:BeSt – Bering Strait; BS – Barents Sea; Gr – Greenland; Km – Kamchatka; KS – Kara Sea; Ku – Kuril Islands; LS – Laptev Sea; Nf – Newfoundland; NS – Norwegian Sea; WS – White Sea.Type locality of D.elegans is marked on the map by “x”.

FIGURE 5 Dendronotus nordenskioeldi sp. nov.ZMMU Op-665, external and internal morphology.a–b:living holotype, dorsal and lateral views respectively;c:ventral view of preserved holotype;d: jaw of holotype; e: irregular denticles on the masticatory edge of the holotype;f:posterior part of radula; g:central teeth of radula; h: lateral teeth of radula of holotype.Scale bars: d: 1mm; e: 20 µm; f:100 µm; g, h: 30 µm. PHOTOGRAPHS BY O. ZIMINA (A, B) AND T. KORSHUNOVA (C). SEM MICROGRAPHS BY A. MARTYNOV

FIGURE 7 Representaives of the genus Dendronotus (living specimens). PHOTOGRAPHS BY T. KORSHUNOVA, A. MARTYNOV, K. FLETCHER, D. MILLER, Y. FUJIWARA, K. HASEGAWA, K. SANAMYAN, N. SANAMYAN, AND O. ZIMINA