Gammarus somaemulensis sp. nov., male, holotype (NNIBRIV92290) A gnathopod 1 B palm of propodus and dactylus in gnathopod 1, setae omitted C gnathopod 2 D palm of propodus and dactylus in gnathopod 2, setae omitted E pereopod 3 F pereopod 4 G coxal plate of pereopod 5 H basis to dactylus of pereopod 5 I dactylus of pereopod 5 J dactylus of pereopod 3. Scale bars: 0.5 mm (A, C, E–H); 0.2 mm (B, D); 0.1 mm (I, J).