Dendronotus zakuro Martynov, Fujiwara, Tsuchida, R. Nakano, N. Sanamyan, K. Sanamyan, Fletcher & Korshunova, 2020

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 : 131

Dendronotus zakuro Martynov, Fujiwara, Tsuchida, R. Nakano, N. Sanamyan, K. Sanamyan, Fletcher & Korshunova, 2020

Fig. 7

Dendronotuszakuro Martynov, Fujiwara, Tsuchida, Nakano, Sanamyan, Sanamyan, Fletcher, Korshunova, 2020a: 505–507 , Figs 3 , 5B .

Extended diagnosis. Body narrow. Six to seven pairs of branched dorsolateral appendages. Five to seven appendages of oral veil. Circa five appendages (posterior ones the longest) of rhinophoral stalks. Lateral papilla of rhinophoral sheaths present. Rhinophores with 10–11 lamellae. Lip papillae 20–30. Basal colour bright red to reddish-brownish with thin white broken lines between dorsolateral appendages, also scattered opaque white dots and speckles on dorsal and lateral sides, and on various appendages. Dorsal processes of jaws inclined posteriorly at approximately 70° to the longitudinal axis of the jaw body and 0.5 of its length. Masticatory processess with ridge-like structures. Radula with up to 36 rows of teeth. Central tooth completely devoid of denticles (except for the anteriormost juvenile radula in some specimens), only sometimes faint traces of furrows occur. Up to 12 lateral teeth with up to seven denticles. Ampulla moderately narrow, sligthly bent. Bursa copulatrix very large, oval. Seminal receptaculum small placed distally at considerable distance from the vaginal opening. Prostate discoid withcirca 25 alveolar glands. The vas deferens is moderate in length, penis conical, curved. Body length upto 30 mm.

Distribution. NW Pacific, so far recorded from Kamchatka, Russia, southern part of Hokkaido and Honshu, Japan (the Sea of Japan side).

Bathymetry. Shallow waters, at depths of circa 7– 20 m.

Remarks. This species has recently been described in detail ( Martynov et al., 2020a).

Figures

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