Coxal plates 1 to 4 elongate, forming a regular shield; epimeral plate 3 broadly prolonged posteriorly, distal margin rounded. Head with prominent lateral lobes, narrower in male than in female; eyes very large, oval to kidney-shaped. Antenna 1 peduncle robust, article 1 inner distal margin with a distinct tooth, variable small to large, articles 2 and 3 not compressed, flagellum a little shorter than the peduncle, about 9-articulate, setose; accessory flagellum about 4-articulate. Antenna 2 in female equal to the length of antenna 1, flagellum up to about 10-articulate, setose; antenna 2 in male longer than the body, peduncle robust, flagellum exceptionally slender, filiform, with calceoli. Gnathopod 1 simple, basis robust. Setose, propodus tapering distally, inner posterior margin with several short spines. Gnathopod 2 very slender, propodus much smaller than the broad carpus, minutely subchelate. Pereiopods 3 and 4 setose, in male setae plumose. Uropod 1 elongate, rami about equal, spinose; uropod 2 shorter than uropod 1, inner ramus constricted distally; uropod 3 peduncle broad, outer ramus in female with a few setae; in male inner margins of rami and peduncle with many plumose setae. Telson short and broad, entire, apical margin about straight.
Up to about 10 mm.
Yellowish, speckled with white.
Frequently recorded and locally common amongst algae in shallow water.
Atlantic coast of Europe and North Africa from Shetlands to Senegal; Mediterranean; Canary Islands; Indian Ocean.