Dendronotus patricki Stout, Wilson & Valdés, 2011

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

Dendronotus patricki Stout, Wilson & Valdés, 2011

Dendronotus patricki Stout et al., 2011: 63–67 , Figs 2–4 .

Diagnosis (original description). Body broad. Three to four pairs of branched dorsolateral appendages. Six appendages of oral veil. Four appendages (posterior ones long) of rhinophoral stalks. Lateral papilla of rhinophoral sheaths absent. Number of rhinophoral lamellae and lip papillae not indicated in the original description. Colour uniformly reddish brown (appears in original description as rather pinkish) with a semitransparent body. Masticatory processeses with ridge-like structures. Radula with upto 31 rows of teeth. Central tooth with upto 20 small denticles without furrows. Up to eight lateral teeth without denticles. Ampulla moderately voluminous with two folded loops. Bursa copulatrix very large, rounded to oval. Seminal receptaculum moderate in size placed distally near the vaginal opening. Prostate discoid with range at least 10 alveolar glands. The vas deferens is very long, penis relatively long, straight, conical. Body length upto 25 mm.

Distribution. Whalefall ‘Patrick’ area (36º42’ 30.31’’ N, 122º 06’ 18.72’’W), Monterey Canyon, USA.

Bathymetry. 1819–1822 mdepth.

Remarks. So far only known from three specimens collected at the type locality.

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 4 Dendronotus yrjargul sp.nov.(a–n) and D.kalikal (o–t), external and internal morphology.a–c: living holotype of D.yrjargul NTNU-VM-76306 (a) and its habitat (b, c), dorsal,ventral and lateral views with egg mass and associated hydroid Abietinaria fusca, respectively; d: Dendronotus yrjargul, habitat of living paratype NTNU-VM-76302;e: jaw of holotype; f:denticles on the masticatory edge of the holotype; g: jaws of paratype NTNU-VM-76302; h:discoid ridge-like structures on the masticatory edge of paratype NTNU-VM-76302;i: details of discoid structures on the masticatory edge of paratype NTNU-VM-76302; j: anterior part of radula of holotype; k:central teeth of radula of holotype;l:lateral teeth of radula of holotype; m:central teeth of radula of paratype NTNU-VM-76302; n: lateral teeth of radula of holotype; o: living holotype of D.kalikal; p: jaw of D.kalikal, specimen from Kurile Islands;