First record of the deep-sea isopod family Dendrotionidae (Isopoda: Asellota) from the Northwest Pacific with description of two new species of Dendromunna
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Two new abyssal species of Dendrotionidae are described: Dendromunna kurilensis sp. nov. from the Northwest Pacific Basin to the east of the Kuril–Kamchatka Trench and D. okhotensis sp. nov. from the Kuril Basin of the Sea of Okhotsk. The new species represent the first records of the family for the Northwest Pacific and the first records of the genus for the North Pacific. The new species differ from the remaining species of Dendromunna by the extremely long antennae and pereopods (antenna I is about 0.7–0.8 body length, article 4 of antenna II is about 0.6–0.7 body length, bases of pereopods are about 0.2–0.3 body length), the male pereopod I with concave lateral margins, short pereonite 1 (<0.03 body length), and the lack of mandibular palp. D. okhotensis sp. nov. differs from D. kurilensis sp. nov. by the more slender body, presence of stout setae on the pereonites 1–4 ventral surface, by different number of maxilliped retinaculae, and by number of spines of the mandibular spine row. The key to the species of Dendromunna is presented.
KeywordsIsopoda Asellota Dendrotionidae Dendromunna Northwest Pacific Kuril–Kamchatka trench area Kuril Basin Sea of Okhotsk Deep sea Abyssal KuramBio SokhoBio Taxonomy New species
The material from the Northwest Pacific Basin was collected and sorted during the KuramBio expedition with the RV Sonne with the financial support of the PTJ (German Ministry for Science and Education), grant 03G0223A to Prof. Dr. Angelika Brandt, University of Hamburg. The material from the Sea of Okhotsk was collected during the SokhoBio expedition with the RV Akademik M.A. Lavrentyev with the financial support of the Russian Science Foundation (Project No. 14-50-00034), and sorted with the financial support of the PTJ (German Ministry for Science and Education), grant 03G0857A to Prof. Dr. Angelika Brandt, University of Hamburg. The taxonomic processing of the material was supported by the Russian Foundation of Basic Research (project 16-04-01431). We thank the crews of the RV Sonne and Akademik M.A. Lavrentyev for their help on board and all student helpers and technicians for support and help with sorting of the extensive expedition material. This is KuramBio publication # 38.
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