Dendronotus comteti Valdés & Bouchet, 1998

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 : 114-115

Dendronotus comteti Valdés & Bouchet, 1998

Dendronotus comteti Valdés and Bouchet, 1998: 320–323 , Figs 1–3 .

Diagnosis (original description). Body narrow. Two or four pairs of partially branched, partiallyunbranheddorsolateralappendages. Four to six appendages of oral veil. Four appendages (similar in size) of rhinophoral stalks. Rhinophores with seven to eight lamellae.Lateralrhinophoral papillapossibly absent. Lip papillae probably absent. Basal colour uniformly pale cream (preserved). Jaws reported as devoid denticles. Radula with up to 28 rows of teeth. Central tooth with deep furrows and with up to ten distinct denticles. Up to six lateral teeth with up to five denticles. The reproductive system was not studied in the original description. Body length upto 5.5 mm (preserved).

Distribution. Middle Atlantic, Lucky Strike area in the Mid-Atlantic Ridge.

Bathymetry. 1685 mdepth.

Remarks. This is the only known species that originated from deep-sea hydrothermal habitats, and which was considered as belongingtothegenus Dendronotus according to its external and internal characters. Molecular data is necessary to determine its phylogenetic position.

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 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”.