Urosome segments fused; without a lateral ridge, uropods inserted laterally. Head with a short rostrum in female, in male the rostrum may be very long. Antenna 1 and 2 moderately setose; female antenna 1 peduncle article 1 ventral margin with 3 or 4 long spines, inner margin with 2 or 3 proximal spines, without a proximal process. Male antenna 1 peduncle article 1 ventral margin with one distal spine, inner margin with a single proximal process but without spines. Female antenna 2 peduncle article 4 distal ventrolateral angle not produced, inner ventral surface with two paired and one solitary spine, article 5 inner distal margin not produced, ventral margin with one or 2 long spines, without proximal process. Male antenna 2 peduncle article 4 distal ventrolateral angle with one large acute process and 1 or 2 smaller processes, inner ventral surface without spines, article 5 inner distal margin produced, ventral margin without spines. Gnathopod 1 palm transverse, evenly convex. Uropod 1 peduncle outer margin with 8 to 11 spines, inner margin with one distal spine; uropod 2 peduncle dorsal surface with 2 to 6 setae, inner margin with one distal spine.
Up to 5 mm.
Shallow subtidal or low intertidal; constructs tubes of mud and detritus on weeds and hydroid, usually in brackish waters, such as brackish lagoons, ditches and rivers.
North Atlantic, widespread, American and European coasts. European coasts from southern Baltic to eastern Mediterranean; also Pacific coast of North and South America; Japan.