Dendronotus europaeus Korshunova, Martynov, Bakken & Picton, 2017

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 : 118

Dendronotus europaeus Korshunova, Martynov, Bakken & Picton, 2017

Fig. 7

Dendronotus europaeus Korshunova, Martynov, Bakken, Picton, 2017: 1–8 , Figs. 1–2 ; Supplementary information, textand figure.

Dendronotusfrondosus sensu Thompson and Brown, 1984 (partim.); not Ascanius, 1774.

Extended diagnosis. Body relatively narrow. Six to nine pairs of branched dorsolateral appendages, including two to three posterior ones. The dorsolateral appendages can generally be described as highly branched, giving this species a fluffy appearance. Eight to 15appendagesof oralveil.Fivetosixappendages (posterior one very long) of rhinophoral stalks. Lateral papilla of rhinophoral sheaths present. Rhinophores with 11–17 lamellae. Lip papillae 20–49.Basalcolourreddish-brownwithopaque white stripes betweendorsolateralprocesses to uniform light yellow with small brown spots. Dorsal processes of jaws inclined posteriorly at approximately 60° to the longitudinal axis of the jaw body and 0.43 of its length. Masticatory processes apparently with fine denticles. Radula with up to 37 rows of teeth. Central tooth with up to 20 small denticles without furrows, rarely completely smooth. Up to 11 (usually 9–10) lateral teeth with up to seven denticles. Ampulla with at least two loops. Bursa copulatrix large, rounded. Seminal receptaculum small placed distally at a short distance from the vaginal opening. Prostate discoid with a range of 35–40 alveolar glands. The vas deferens is very long, penis relatively narrow, bent. Body length up to 100 mm.

Distribution. NE Atlantic, so far known from the Netherlands, Norway, Sweden and the UK.

Bathymetry. 15–150 mdepth.

Remarks. This species has been separated from from D. frondosus and D. lacteus based on both morphological and molecular evidence ( Korshunova et al., 2017b).

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 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