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Stock, 1966

Urosome with an only very weakly elevated dorsal margin, spine groups with a few short setae, spines elongate. Epimeral plates 2 and 3 with the distal angle acutely produced, posterior margin regularly concave, plate 2 posterior margin with several short setules, plate 3 with one or no setule. Head with the lateral lobes sloping forwards, upper angle produced, post-antennal sinus shallow; eyes small, elongate kidney-shaped. Antenna 1 peduncle sparsely setose, peduncle article 1 with one ventral setal group, article 2 with one or two setal groups, article 3 with one setal group (excluding apical setae); accessory flagellum elongate, much longer than peduncle article 1, about 8 to 12-articulate. Male antenna 2 peduncle articles 4 and 5 with a dense transverse row of setae, those on the inner surface often curled distally, flagellum very short, up to only about 12-articulate, proximal articles also densely setose, proximal articles with calceoli. Female antenna 2 only sparsely setose, without tufts of curled setae, calceoli absent. Mandible palp article 1 devoid of setae, article 3 with one or two setal groups on the outer surface, ventral setae comb-like, graduated, becoming shorter proximally. Male gnathopod 1 propodus, palmar margin strongly sinuous, large truncated median spine well separated from the angle spines, proximal posterior margin with about five to seven setal groups. Male gnathopod 2 propodus much broader than in gnathopod 1 and the palm less oblique, margin only slightly sinuous, truncated median spine well separated from the angle spines, posterior margin with about eight or nine setal groups. Female gnathopod 1 propodus suboval, palm oblique; female gnathopod 2 propodus subrectangular, palm almost transverse. Pereiopod 5 basis only slightly longer than wide, distal angle freely produced. Pereiopod 6 basis with the posterior margin strongly convex. Pereiopod 7 basis only slightly longer than wide, posterior margin angular, distal angle not freely produced but with a pair of stout spines; merus and carpus strongly spinose but without setae amongst spines. Uropod 3 rami about equal in length, margins with spines and plumose setae. Telson lobes with three apical spines, one subapical spine, three lateral spines, occasional small seta only.

Up to 20 mm.


Intertidal, on exposed sandy beaches, often in pools amongst algae, also in estuaries.

Atlantic coast of Europe from Netherlands to Mediterranean.

Gammarus crinicornis