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A new snailfish,    Paraliparis   flammeus   , is described on the basis of 18 specimens collected off the Pacific coast of Tohoku District, northern Japan at depths of 422–890 m. The new species is distinguished from 28 species of    Paraliparis    described from the North Pacific by the following combination of characters: mouth oblique; uppermost pectoral-fin base below horizontal through posterior margin of maxillary; 60–63 vertebrae, 54–58 dorsal-fin rays, 50 or 51 anal-fin rays, six principal caudal-fin rays, and 17–20 pectoral-fin rays. A maximum likelihood tree based on 106  COI  gene sequences (492 bp) of    Paraliparis    recovered a monophyletic group comprising    P.   flammeus   ,    Paraliparis   cephalus   , and    Paraliparis   dipterus   .    Paraliparis   cephalus    is similar to    P.   flammeus    in having an oblique mouth, but it has four caudal-fin rays (vs six rays) and the uppermost pectoral-fin base above a horizontal through the maxillary posterior margin.    Paraliparis   dipterus    differs from    P.   flammeus    in having a horizontal mouth, 12–14 pectoral-fin rays, and lacking pyloric caeca (present in    P.   flammeus   ).    Paraliparis   flammeus    is most similar to the eastern North Pacific    Paraliparis   mento    in having an oblique mouth and the uppermost pectoral-fin base below a horizontal through the posterior margin of the maxillary. However,    P.   flammeus    differs from    P.   mento    in having six caudal-fin rays (vs five rays) and greater preanal length (29.9–35.3% SL vs 26.7–28.5% SL). A poorly known species,    Paraliparis   mandibularis   , previously known from only two specimens collected from Tosa Bay, southern Japan, is redescribed based on the holotype and seven newly collected specimens. It is also similar to the new species but has 27–30 pectoral-fin rays and a shorter pectoral-fin lower lobe (13.8–15.9% SL in    P.   mandibularis    vs 16.7–23.4% SL in    P.   flammeus   ).

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A new species of snailfish of the genus    Paraliparis    (  Liparidae  ) from the western North Pacific, with a redescription of the poorly known species    Paraliparis   mandibularis