Body slender, especially in male; posterior margin of epimeral plate 3 broadly truncated, posterodistal angle rounded. Female antenna 1 slender, reaching only little beyond end of peduncle of antenna 2, peduncle article 1 very short, article 2 long and slender, flagellum about 20-articulate with long setae; Antenna 1 in male relatively longer than in female; antenna 2 in female about three-quarters body length. peduncle article 5 slightly shorter than 4; in male antenna 2 very slender and longer than body. Pereiopods 3 and 4 propodus and dactylus about equal, both much longer than carpus. Pereiopod 7 basis much longer than rest of appendage, posterior lobe obliquely expanded with numerous plumose setae on distal margin, ischium shorter than merus, carpus with anterior margin spinose, propodus narrow with several large spines, dactylus spiniform. Uropod 3 rami with confronted margins finely serrate, inner margin of inner ramus with several small spines and plumose setae. Telson short and rounded with a small apical cleft.
Up to 15 mm, occasionally over 20 mm.
Whitish with orange shading, front of head mottled dark violet.
Depth range from 5 to 575 metres, often on fine sand or clay sediments.
Arctic, circumpolar. North Pacific, North Atlantic, northern North Sea, southerly limit about latitude 55 N.