Pleon segments toothed but variable; segment 2 often with a large median tooth and two smaller lateral teeth, segments 4 and 5 with a small median tooth and two larger lateral teeth; segment 5 also with a pair of spinules. Coxal plates 1 to 3 posterodistal angle with a small tooth; female plate 6 with an anterior lobe, distinctly bilobed. Epimeral plate 3 distal angle with a large tooth, posterior margin smooth or very weakly serrate. Head with the lateral lobes broadly rounded; eyes small, rounded. Antenna 1 and 2 sparsely setose; antenna 1 about three-quarters the body length, peduncle article 1 with three or four ventral marginal spinules, flagellum up to about 30-articulate; accessory flagellum 4-articulate. Antenna 2 peduncle very slender, article 2 with a large spine on the inner margin, articles 4 and 5 about equal in length, flagellum about 10-articulate. Gnathopod 1 propodus about equal in length to the carpus, palm oblique and minutely spinulose; propodus a little more slender in male than in female. Female gnathopod 2 much larger than gnathopod 1, propodus suboval, palm oblique and weakly sinuous, delimited by a small spine, palmar margin spinulose. Male gnathopod 2 very robust, merus acute distally, carpus short, propodus very large and broad distally, palm transverse and irregularly toothed, inner surface of the propodus with a distinct tooth against which the dactylus closes, dactylus very broad and flattened with a blunt apex. Pereiopods 5 to 7 robust, basis with the posterior margin serrate. Uropod 3 outer ramus less than twice the length of the peduncle, spinose, inner ramus very small. Telson cleft to the base, lobes apically acute, each with two or three inner-marginal spines and one outer-marginal spine.
Up to 9 mm.
Pale brown mottled with reddish brown.
Depth range from 0 to 375 metres. Reported as commensal on the anemone Anemonia viridis .
North-East Atlantic; Atlantic coast of Europe from western Norway to the Mediterranean, and North Africa to Senegal; Azores.