G.O. Sars, 1882
Body very robust, pereion segment 7 and pleon segments 1 to 3 each produced dorsally into a pair of strong backwardly directed processes. Coxal plates 1 to 4 acute distally, plates 5 to 7 rounded. Epimeral plate 3 with two large upturned teeth. Head with a large curved rostrum reaching to the end of peduncle article 1 of antenna 1, lateral lobes acute, deflexed; eyes large, oval-kidney-shaped. Antenna 1 about one-third of the body length, peduncle article 1 ventral margin with a small distal tooth, article 2 dorsal margin with a small tooth, flagellum up to about 17-articulate, anterior margin setose. Antenna 2 only slightly longer than antenna 1, flagellum up to about 17-articulate, anterior margin setose. Gnathopod 1 very slender, feeble, basis weakly angular, carpus and propodus subequal in length and extremely slender, propodus minutely chelate with a few, long plumose setae. Gnathopod 2 also elongate and slender, but much larger than gnathopod 1, propodus minutely chelate, with several long setae. Basis of pereiopods 5 to 7 rounded proximally; basis of pereiopod 5 with the distal margin rounded; basis of pereiopod 6 with the posterodistal angle acute; basis of pereiopod 7 with the distal angle acute, prolonged, distal margin with an obtuse accessory tooth, posterior margin serrate. Uropods 2 and 3 inner ramus longer than the outer ones. Telson slightly tapering distally, apex emarginate, with the distolateral angles acute, each with small setule.
Up to about 6 mm.
Variable, yellowish with red or brown bands, sometimes almost black.
Depth range from 0 to 40 metres; a shallow-water species usually found amongst algae, occasionally collected intertidally; may be locally quite numerous.
North and west Norway; Atlantic coast of Europe to the western Mediterranean; North Africa to Senegal.