Ambloxus Hannibal, 1912 accepted as Elimia H. Adams & A. Adams, 1854 (original description)
Ambloxus olequaensis Arnold & Hannibal, 1912 † accepted as Goniobasis olequaensis (Arnold & Hannibal, 1912) † (original description)
Brannerillus Hannibal, 1912 † (original description)
Brannerillus physispira Hannibal, 1912 † (original description)
Corneocyclas (Pisidium) meeki Hannibal, 1912 † accepted as Pisidium meeki Hannibal, 1912 † (original description)
Fisherola Hannibal, 1912 (original description)
Gonidea hemphilli Hannibal, 1912 † (original description)
Helisoma (Perrinilla) cordillerana Hannibal, 1912 † accepted as Vorticifex cordillerana (Hannibal, 1912) † (original description)
Lanx (Walkerola) Hannibal, 1912 accepted as Lanx Clessin, 1880 (original description)
Lanx (Walkerola) klamathensis Hannibal, 1912 accepted as Lanx alta (Tryon, 1865) (original description)
Lioplax andersoniana Hannibal, 1912 † (original description)
Margaritana (Pseudunio) herrei Hannibal, 1912 † accepted as Margaritifera herrei (Hannibal, 1912) † (original description)
Pachychilus drakei Arnold & Hannibal, 1912 † accepted as Goniobasis drakei (Arnold & Hannibal, 1912) † (original description)
Pachychilus lawsoni Hannibal, 1912 † accepted as Lymnaea lawsoni (Hannibal, 1912) † (original description)
Perrinilla Hannibal, 1912 † (original description)
Planorbis (Segmentina) mojavensis Hannibal, 1912 † accepted as Planorbula mojavensis (Hannibal, 1912) † (original description)
Pyrgulopsis williamsi Hannibal, 1912 † accepted as Fluminicola williamsi (Hannibal, 1912) † (original description)
Sphaerium (Amesoda) andersonianum Hannibal, 1912 † represented as Sphaerium andersonianum Hannibal, 1912 † (original description)
Sphaerium (Amesoda) catherinae Hannibal, 1912 † represented as Sphaerium catherinae Hannibal, 1912 † (original description)
Sphaerium (Amesoda) rogersi Hannibal, 1912 † represented as Sphaerium rogersi Hannibal, 1912 † (original description)
Unio transpacifica Arnold & Hannibal, 1912 † accepted as Plesielliptio transpacificus (Arnold & Hannibal, 1912) † (original description)
Viviparus washingtonianus Arnold & Hannibal, 1912 † (original description)