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Three new species of the rare deep-sea family Haplomunnidae are described from the abyssal of the Northwestern (NW) Pacific adjacent to the Kuril–Kamchatka Trench (KKT) based on material collected during the deep-sea expeditions KuramBio (2012) and SokhoBio (2015). Previously, only three species of the genus Haplomunna Richardson, 1908 were described in the whole North Pacific, including one species from its western part. Haplomunna kurilensis Golovan and Malyutina sp. nov., closely resembling H. japonica (Gamô, 1983) from the upper hadal of the Japan Trench, was the most numerous haplomunnid species in the studied region. Thylakogaster wilsoni Malyutina and Golovan sp. nov., and Abyssaranea minuta Golovan and Malyutina sp. nov., are the first species of their genera described from the Pacific Ocean. For H. kurilensis sp. nov. and T. wilsoni sp. nov., DNA sequences were obtained for 18S rRNA and 28S rRNA genes. The phylogenetic relationship between these species, as well as their position within the Haplomunnidae, were reconstructed using 18S rDNA.

Eurycope producta Sars, 1868 is a highly abundant and widely distributed munnopsid species complex within Icelandic waters. The complex differs from all other Eurycope Sars, 1864 species by having a broad and long rostrum with serrated margins, which is subequal in length and width to article 1 of antenna I. Previous molecular evidence to disentangle the E. producta species complex forms the base for the herein-presented taxonomic description of six new species belonging to the genus Eurycope. Additionally, descriptions of specimens of E. producta sensu stricto and E. dahli Svavarsson, 1987, which were included in the analyses, are presented herein for morphological comparison with the new species. The studied species can be divided in two subgroups: (1) E. producta sensu stricto, E. dahli, E. mishkai sp. nov., and E. nikitai sp. nov. and (2) E. gordeyi sp. nov., E. emmae sp. nov., E. jakobi sp. nov., and E. mathiasi sp. nov. Additionally, a key to the eight studied species of the complex is presented.