New Data on the Shortcrevice Eelpout Gymnelopsis brevifenestrata (Zoarcidae) from the Sea of Okhotsk

Shortcrevice eelpout Gymnelopsis brevifenestrata (Zoarcidae, Gymnelinae) is an endemic species of the Sea of Okhotsk; until recently, it was known by 12 type specimens from the museum collections. The variability of the species was characterized and its distribution was revised by the study of several new specimens and paratypes. The live coloration of males is described for the first time, giving new characters for the field taxonomic identification of this species. G. brevifenestrata inhabits the western and northern Sea of Okhotsk at the depth range of 76–200 m. Considering the association of G. brevifenestrata to supercooled waters, it should be assigned to the glacial group of Okhotsk-sea species.