Adults are generally found at depths greater than 150 m during the day. Oviparous, with planktonic eggs and larvae , which are distributed in the sub-arctic gyre south to about 47°N .
Dorsal spines (total): 0; Dorsal soft rays (total): 10 - 11; Anal spines: 0; Anal soft rays: 11 - 14; Vertebrae: 47 - 52. Body slender and compressed. Anal fin base short, and almost equal to dorsal fin base. snout pointed. Eye diameter shorter than snout length. Upper jaw shorter than lower jaw. Teeth present on lower jaw, prevomer, palatine, but not on upper jaw. Branchiostegals, 2. Color silvery, dusky on dorsal surface and fins .: elongated; Cross section: compressed.
Behavioural data for Northern smoothtongue is currently being reviewed.
Diet information for Northern smoothtongue is currently being compiled.
Oviparous .
Marine; bathypelagic; depth range 394 - 1800 m . Deep-water; 61°N - North Pacific: southeastern Hokkaido, Japan to Navarin Canyon in the Bering Sea and southern British Columbia, Canada.
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 2 records indexed .
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