Heard, W.H. & R.H. Guckert. 1970. A re-evaluation of the recent Unionacea (Pelecypoda) of North America. Malacologia 10: 333-355. Available electronically.
‘Swainson’ Heard & Guckert, 1970. Malacologia 10: 348, note 18.
(error for Cunicula Swainson, 1840)
Type species: Unio purpurascens Lamarck, 1819 = Elliptio complanata
+ Amblema costata Rafinesque, 1820
+ Pleurobema mytiloides Rafinesque, 1820