Female easily confused with Dyopedos monacanthus . Coxal plates very small; plate 2 in male with a spiniform anterodistal process. Head slightly prolonged forwards; eyes large, rounded-oval, protruding. Antenna 1 long and slender, may be moderately robust in male, little longer than the body length, setose, flagellum equal to the length of the peduncle article 3, 5-articulate; accessory flagellum very small, 3-articulate. Antenna 2 two-thirds of the length of antenna 1, slender, densely setose. Gnathopod 1 small, simple, carpus longer than the propodus. Female gnathopod 2 small, carpus triangular, propodus oval and twice the length of the carpus, palmar margin with a single slender median spine, dactylus less than half the length of the propodus. Male gnathopod 2 very large and robust, basis with a large anterodistal lobe, propodus narrow, elongate, palm with a long straight proximal process and a rounded or triangular distal tooth, dactylus large, robust, setose, inner margin sinuous with a small proximal tubercle. Pereiopods 3 and 4 small, basis expanded, oval. Pereiopods 5 to 7 not greatly elongate, carpus spinose, dactylus very small. Uropods 1 and 2 peduncle outer margin and rami margins minutely toothed, spinose; uropod 2 peduncle inner margin with a few short setae; uropods 1 and 2 outer ramus two-thirds of the length of the inner one; uropod 1 rami with a long apical spine. Telson rounded.
Up to about 6.5 mm.
Whitish, with narrow brown bands.
Depth range from 15 to 700 metres, often associated with hydroids and bryozoans.
North Atlantic. American and European coasts; Arctic Ocean. European coasts from northern Norway to the English Channel.