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Liljeborg, 1852

Urosome segments 1 to 3 with weakly developed dorsal humps, spine groups with several long setae. Epimeral plates 2 and 3 subquadrate, posterior margin with several long setae, set in notches. Head with the lateral lobes broadly truncated, post-antennal sinus deep. Eyes moderately large, elongate kidney-shaped. Antenna 1 peduncle sparsely setose, article 1 shorter than articles 2 and 3 together; accessory flagellum a little shorter than the peduncle article 2, about 5 or 6-articulate. Antenna 2 moderately setose, flagellum with calceoli in male. Mandible palp article 1 with one or two apical setae, article 3 with one setal group on the outer surface, ventral setae comb-like, not graduated. Male gnathopod 1 propodus palm about straight with the median palmar spine equal spaced with the row of angle spines, proximal posterior margin densely setose. Male gnathopod 2 propodus much broader than in gnathopod 1 and the palm less strongly oblique, median palmar spine forming a continuous row with three or four angle spines, proximal posterior margin densely setose. Female gnathopod 1 propodus suboval, palm oblique, convex, margin with four well spaced spines. Female gnathopod 2 propodus rectangular, palm transverse, margin with four well spaced spines. Pereiopods densely setose, less densely setose in female than in male; setae much longer than the associated spines. Pereiopods 5 to 7 slender, basis with the posterodistal angle freely produced, angle without spines but with a group of subangular setae. Uropod 3 inner ramus more slender than the outer one and about one-half to two-thirds of its length, margins extremely densely setose, inner marginal setae plumose; setae less dense in female. Telson with each lobe with four apical spines, nil or one subapical spine, two or three lateral spines, each group with several long setae.

Up to 22 mm in male, 16 mm in female.

Dark greenish or brownish, with pink patches on sides of the pleon.

A brackish-water species with wide salinity tolerance: found on rocky shores in pools near to high water with freshwater influence, in estuaries amongst vegetation and in freshwater streams and lakes.

North East Atlantic, North Sea, Bothnian Bay.

Gammarus duebeni