Body very long and slender, with the anterior pereion almost cylindrical. Coxal plates short and scarcely overlapping; plate 1 produced forwards, apex acute, plates 1 and 2 with the posterodistal margin weakly serrate. Epimeral plate 3 quadrate, distal angle with a very small tooth; plate 2 posterodistal angle obtuse and also with a small tooth. Head with convex lateral lobes; eyes small and rounded, eyes may be inconspicuous in spirit preserved material. Antenna 1 very slender, and almost equal to the body length, peduncle very elongate and slender, flagellum shorter than the peduncle; accessory flagellum well developed, about 7-articulate. Antenna 2 only half the length of antenna 1, peduncle article 5 shorter than article 4, flagellum short. Gnathopod 1 carpus and propodus about equal in length, both densely setose, propodus oval, palm oblique and convex, poorly delimited. Gnathopod 2 robust and much larger than gnathopod 1, merus acute distally, carpus triangular and setose, propodus broad, subrectangular, densely setose, palm almost transverse with the margin coarsely and irregularly toothed, delimited by a very long and slender spine, dactylus setose along the outer margin. Pereiopods 5 to 7 elongate, slender, basis robust but scarcely expanded. Uropod 1 peduncle with a median submarginal spine; uropods 1 and 2 rami about equal, spinose; uropod 3 rami elongate, lanceolate, spinulose. Telson deeply cleft, lobes divergent, each with the apex acute and with small subapical spinule and tooth.
Up to about 25 mm.
Depth range from 20 to 400 metres.
North Atlantic, American and European coasts; Arctic Ocean; Greenland; Iceland; European coasts from northern Norway to British Isles.