Body robust; pleon segment 4 depressed dorsally with pair of anteriorly directed setae and pair of stout posteriorly directed spines. Coxal plate 1 apex broadly rounded, posterior margin smooth, posterodistal margin with 3 to 5 long setae; coxal plates 2 and 3 posterodistal angle without tooth, or with very small notch, distal margin with 6 to 10 setae; coxal plate 4 rounded, distal margin with about 24 long setae. Epimeral plate 3 posterodistal margin rounded or with minute tooth, distal margin with 4 or 5 spine groups. Head with eyes rounded in female, kidney-shaped in male. Antenna 1 peduncle article 1 with distal margin straight and upper angle narrowly rounded, ventral margin with 3 or 4 plumose setae, flagellum in female 6 to 7-articulate, in male 9 to 11-articulate. Antenna 2 in female 8 to 11-articulate, in male filiform exceeding body length.
Up to 6 mm.
Body well pigmented, especially on the pleon and pereiopods.
Usually found intertidally just below the level of HWN tides.
Isefjord, around the British Isles.