Hyalella mboitui sp. nov., Department of Ñeembucú, Paraguay. Paratype, male A habitus B antenna 1 C antenna 2 D upper lip E left mandible, with detail of lacinia and incisor rotated anticlockwise (E1) and clockwise (E2) F right mandible, with detail of lacinia and incisor rotated anticlockwise (F1) and clockwise (F2) G lower lip H maxilla 1 I maxilla 2 J maxilliped. Scale bars: 1 mm (A); 0.5 mm (B, C); 0.2 mm (D–J); 0.1 mm (E1, E2, F1, F2).