Urosome segment 1 with a very small flattened dorsal keel. Epimeral plate 3 distal angle quadrate or with a minute tooth, posterior margin about straight. Head with the ventral margin convex. Female antenna 1 reaching beyond the mid-point of the flagellum of antenna 2, peduncle reaching beyond the peduncle article 4 of antenna 2, article 1 only half the length of article 2, flagellum up to about 30-articulate, flagellar articles with long setae; in male antenna 1 less than half the length of antenna 2, flagellum very slender, up to 30-articulate. Female antenna 2 more than half the body length, peduncle articles 4 and 5 about equal in length; in male antenna 2 a little longer than the body length, flagellum extremely slender. Pereiopod 3 merus without a distal lobe; pereiopods 3 and 4 dactylus rather straight, equal to the length of the carpus and propodus together. Pereiopod 7 basis longer than rest of the appendage, ischium longer than the merus, propodus small and oval. Uropods 1 and 2 with small marginal spines; uropod 3 rami with only a few long distal setae. Telson elongate, deeply cleft, each lobe with one or two dorsal setules and a small group of apical setules.
Up to 15 mm.
Depth range from 30 to 835 metres.
North Atlantic; American and European coasts, Atlantic coast of Europe and the North Sea to the Canary Islands.