Dendronotus primorjensis Martynov, Sanamyan & Korshunova, 2015

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 : 126-127

Dendronotus primorjensis Martynov, Sanamyan & Korshunova, 2015

Fig. 7

Dendronotus primorjensis Martynov et al., 2015a: 60 , Fig. 5A–G ; Martynov et al., 2015c: 75–76; Korshunovaet al., 2016b: 15–28, Figs 1 , 2; Korshunovaet al., 2016a: 20–32; Korshunova et al., 2019b: 6–8, Fig. 3A–F .

Dendronotus dudkai Ekimova et al. (2016) : 33 –38, Figs 9–11 (synonym of D. primorjensis ).

Extended diagnosis. Body narrow. Fiveto nine pairs of branched dorsolateral appendages (including 2–3 smaller pairs). Five to twelve oral veil appendages. Four to five appendages (internal middle and posterior ones longest) of rhinophoral stalks.Lateralpapillaof rhinophoral sheaths present. Rhinophores with 8–12 lamellae.Fiveto 12lip papillae.Basalcolournonuniformlyreddishbrownwithfewopaquewhite stripes between dorsolateral processes to more uniformly olive almost without white pigment, or almost lacking general pigmentation. Dorsal processes of jaws inclined posteriorly at approximately 45–47° to thelongitudinalaxis of thejawbodyand 0.48 of itslength. Masticatory processes bear denticles and ridge-like structures. Radula with up to 41 rows of teeth. Central tooth with deep furrows and with upto 18 (common range 12–14) distinct denticles. Up to nine lateral teeth with up to eight denticles. Ampulla moderately narrow with several windings or folded loops. Bursa copulatrix large, rounded. Seminal receptaculum small placed distally at a moderately short distance from the vaginal opening. Prostate discoid with range 12– 19 alveolar glands. The vas deferens is moderate in length, penis relatvely long, curved. Reported body length upto 35 mm.

Distribution. NW Pacific, common in the northern part of the Sea of Japan, at both the Russiancoastandat Hokkaidoonthe Japanese coast ( Korshunova et al., 2016b, 2019b).

Bathymetry. 3–20 mdepth.

Remarks. Dendronotus dudkai Ekimova et al. (2016) isasynonymof D.primorjensis according to morphological, molecular and geographical data. For discussion see Korshunova et al. (2016b, 2019b).

Figures

FIGURE 1 Phylogenetic relationships of the species of the genus Dendronotus based on COI + 16S + 28S + H3 concatenated dataset inferred by Bayesian Inference (BI). Numbers represent posterior probabilities from BI and bootstrap values for Maximum Likelihood.Some branches are collapsed at species level.Dendronotus elegans from the type region (North Atlantic) are highlighted in dark purple. Abbreviations:h – holotype; p – paratype.Summary of species delimitation results from ABGD analyses for the COI dataset is shown

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