Urosome segment 1 with a prominent angular dorsal keel, especially large in male. Epimeral plate 3 with a large tooth on the distal angle, posterior margin convex. Head with ventral margin convex. Female antenna 1 very short and slender, only just reaching end of peduncle article 4 of antenna 2, article 1 about two-thirds length of antenna 2, flagellum about 8-articulate; antenna 1 in male reaching to mid-point of peduncle article 5 of antenna 2. Antenna 2 peduncle extremely long and slender, in female antenna 2 almost as long as body, in male equal to body length, peduncle article 5 little shorter than 4. Pereiopod 3 merus without distal lobe; pereiopods 3 and 4 dactylus little longer than carpus and propodus combined, weakly curved. Pereiopod 7 basis about equal to length of rest of appendage, ischium little shorter than merus, merus with large distal lobe overlapping carpus and with few plumose setae. propodus very large and broadly oval. Uropods 1 and 2 rami with small marginal spines; uropod 3 rami without long marginal setae. Telson elongate, cleft to two-thirds length, with several small dorsal setules.
Up to 10 mm.
Body rather colourless except for a few yellow speckles.
Deeper water; depth range from 60 to 3200 metres.
North Atlantic, Greenland, Iceland, north and west Norway; North Sea; Mediterranean, Adriatic.