Gammarus somaemulensis sp. nov., male, holotype (NNIBRIV92290) A coxal pate of pereopod 6 B basis to dactylus of pereopod 6 C coxal pate of pereopod 7 D basis to dactylus of pereopod 7 E inner surface near posterodistal corner of basis in pereopod 7 F pleopod 1 G inner distal corner of peduncle in pleopod 1 H–J epimeral plates 1–3, respectively K–M pleonites 1–3, respectively. Scale bars: 0.5 mm (A–D, F, H–M); 0.2 mm (E); 0.05 mm (G).