Unio austenii Forbes, 1856 † (additional source)
Unio brightoni F. R. Woodward, 1965 † (original description)
Unio cumberlandi F. R. Woodward, 1965 † (original description)
Unio edwardsii S. V. Wood, 1864 † (additional source)
Unio gibbsii Forbes, 1856 † (additional source)
Unio michaudi Deshayes, 1858 † accepted as Propotomida michaudi (Deshayes, 1858) † (additional source)
Unio nuttalli F. R. Woodward, 1965 † (original description)
Unio solandri J. De C. Sowerby, 1826 † accepted as Palindonaia solandri (J. De C. Sowerby, 1826) † (additional source)
Unio subparallela S. V. Wood, 1864 † accepted as Unio subparallelus S. V. Wood, 1864 † (additional source)
Unio vectensis S. V. Wood, 1864 † accepted as Modellinaia vectensis (S. V. Wood, 1864) † (source of synonymy)