Body weakly dorsoventrally flattened in male, less so in female; pereion segment 2 elongate in male; urosome segments 1 and 2 with a pair of dorsal setae. Coxal plates 1 to 4 about equal length in female; plate 2 much broader and more rounded than the others in male; plate 5 with the anterior lobe slightly longer than in plate 4 in female, much longer in male. Epimeral plate 3 posterodistal margin rounded or weakly angular. Head with lateral lobes angular, truncated: eyes small and rounded. Antenna 1 half body length, flagellum slender and longer than peduncle, about 15 to 20-articulate; accessory flagellum 5 to 7-articulate. Antenna 2 much shorter than 1, flagellum short, about 7-articulate. Gnathopod 1 densely setose, basis in male with large posterodistal lobe, propodus oval, about equal or little shorter than carpus, palm angular, minutely toothed, delimited by long spine, dactylus little longer than palm, inner margin minutely toothed. Female gnathopod 2 carpus and propodus about equal, densely setose, palm short, minutely toothed, delimited by obtuse angle. Male gnathopod 2 very robust, basis broad, tapering proximally, anterior margin with prominent ridge, carpus broad, posterior margin with tufts of strong setae, propodus smaller than carpus, oval, posterior margin with tufts of strong setae, palm short, angular, delimited by stout spine or tooth, dactylus much longer than palm. Pereiopods 3 and 4 merus equal to combined length of carpus and propodus, propodus and dactylus very slender. Pereiopods 5 to 7 basis elongate, only weakly expanded, setose; pereiopods increasing in length from 5 to 7. Uropods 1 and 2 spinose, peduncle with stout distoventral tooth; uropod 3 rami equal to length of peduncle, spinose. Telson broadly rounded, distolateral angles with a tiny recurved hook and a pair of short setae.
Up to 8 mm.
Whitish, with distinct dark brown bands on the pereion and coxal plates.
Depth range from 5 to 100 metres.
Arctic-boreal; very widespread; Arctic Ocean; North Atlantic, American and European coasts; Öresund, Faeroes, west and north Norway, Iceland, northeast British Isles.