Urosome segment 1 with a prominent rounded dorsal keel, especially large in male; pleon segments 1 to 3 with a very slight dorsal keel. Epimeral plate 3 distal angle quadrate or with a minute tooth, posterior margin about straight. Head narrowly truncated, ventral margin convex. Antenna 1 in male and female about half body length, peduncle reaching to end of peduncle article 4 of antenna 2, peduncle article 1 about two-thirds length of 2, flagellum elongate about 30-articulate, flagellar articles with long setae. Female antenna 2 more than half body length, in male equal to body length, peduncle articles 4 and 5 about equal. Pereiopod 3 merus without distal lobe; pereiopods 3 and 4 dactylus rather straight and equal to length of carpus and propodus combined. Pereiopod 7 basis about equal to length of rest of appendage, ischium longer than merus, merus with very small anterodistal lobe, propodus elongate oval. Uropods 1 and 2 peduncle and rami with numerous small marginal spines; uropod 3 rami with numerous long setae. Telson elongate, deeply cleft, without dorsal setules and with only few short apical setules.
Up to 15 mm.
Pale yellow, with orange speckles and shading.
Depth range from 0 to 650 metres, usually on coarse sand, fine or medium gravel or mixed sediments.
North Atlantic. American and European coasts; north and west Norway; North Sea; Atlantic coast of Europe and North Africa to Senegal.