Anodonta parallela C. A. White, 1878 † (additional source)
Costanaia MacNeil, 1935 † (basis of record)
Diplodon haroldi Reeside, 1927 † (additional source)
Elliptio salissiensis L. S. Russell, 1952 † (basis of record)
Elliptio silberlingi L. S. Russell, 1934 † accepted as Plesielliptio silberlingi (L. S. Russell, 1934) † (additional source)
Hadrodon Yen, 1952 † (basis of record)
Hadrodon lateralis Yen, 1952 † (basis of record)
Lampsilis chadronensis Mansfield, 1933 † (additional source)
Lampsilis dalyi L. S. Russell, 1952 † (additional source)
Lampsilis marshalli MacNeil, 1935 † accepted as Potamilus marshalli (MacNeil, 1935) † (additional source)
Margaritifera subflabellata (Rollier, 1910) † (basis of record)
Megalonoidea porcata MacNeil, 1935 † (basis of record)
Megalonoidea rugicosta MacNeil, 1935 † (basis of record)
Murraia naiadiformis L. S. Russell, 1932 † (basis of record)
Mycetopoda diliculi [sic] † accepted as Mycetopoda diluculi Pilsbry, 1921 † (basis of record)
Mycetopoda diluculi Pilsbry, 1921 † (additional source)
Nippononaia asinaria Reeside, 1957 † (basis of record)
Nippononaia paraholmesiana (Yen, 1954) † (basis of record)
Nippononaia ryosekiana (K. Suzuki, 1941) † (basis of record)
Plethobasus aesopiformis (Whitfield, 1903) † (status source)
Plethobasus biesopoides (Whitfield, 1907) † (status source)
Pleurobema dyeri L. S. Russell, 1967 † (basis of record)
Potamilus marshalli (MacNeil, 1935) † (basis of record)
Proparreysia letsoni (Whitfield, 1907) † (basis of record)
Proparreysia verrucosiformis (Whitfield, 1903) † (basis of record)
Protamblema belliplicata (Meek, 1871) † (additional source)
Protamblema macneili Modell, 1957 † (basis of record)
Pseudohyria gobiensis MacNeil, 1936 † (additional source)
Quadrula cylindricoides (Whitfield, 1907) † (additional source)
Rhabdotophorus gracilis L. S. Russell, 1935 † (additional source)
Tacuaremboia caorsii S. Martinez, Figueiras & J. S. Silva, 1993 † (basis of record)
Tritigonia natosini (McLearn, 1929) † accepted as Tritogonia natosini (McLearn, 1929) † (additional source)
Unio (Baphia) nebrascensis Meek, 1871 † accepted as Amblema nebrascensis (Meek, 1871) † (additional source)
Unio aldrichi C. A. White, 1878 † accepted as Rhabdotophorus aldrichi (C. A. White, 1878) † (additional source)
Unio belliplicatus Meek, 1871 † accepted as Protamblema belliplicata (Meek, 1871) † (additional source)
Unio brimhallensis Stanton, 1916 † accepted as Lampsilis brimhallensis (Stanton, 1916) † (additional source)
Unio cylindricoides Whitfield, 1907 † accepted as Quadrula cylindricoides (Whitfield, 1907) † (basis of record)
Unio dockumensis C. T. Simpson, 1896 † accepted as Antediplodon dockumensis (C. T. Simpson, 1896) † (additional source)
Unio emersoni Troxell, 1914 † (additional source)
Unio felchii C. A. White, 1886 † accepted as Eurynia felchii (C. A. White, 1886) † (additional source)
Unio goniambonatus C. A. White, 1878 † accepted as Amblema goniambonatus (C. A. White, 1878) † (additional source)
Unio gonionotus C. A. White, 1876 † accepted as Amblema gonionotus (C. A. White, 1876) † (additional source)
Unio nanaimoensis Whiteaves, 1901 † accepted as Elliptio nanaimoensis (Whiteaves, 1901) † (additional source)
Unio natosini McLearn, 1929 † accepted as Tritogonia natosini (McLearn, 1929) † (additional source)
Unio paraholmesianus Yen, 1954 † accepted as Nippononaia paraholmesiana (Yen, 1954) † (new combination reference)
Unio sewardi F. R. Woodward, 1971 † (additional source)
Unio stantoni C. A. White, 1907 † accepted as Plesielliptio stantoni (C. A. White, 1907) † (additional source)
Unio subplanatus C. T. Simpson, 1896 † accepted as Rhipidodonta subplanata (C. T. Simpson, 1896) † (additional source)
Unio subspatulatus Meek & Hayden, 1857 † accepted as Plesielliptio subspatulatus (Meek & Hayden, 1857) † (additional source)
Unio thomasi J. Henderson, 1934 † accepted as Antediplodon thomasi (J. Henderson, 1934) † (additional source)
Unio thulei F. R. Woodward, 1971 † (additional source)
Unio wilbrahamensis (B. K. Emerson, 1900) † (additional source)
Vetulonaia faberi Holt, 1942 † (basis of record)
Vetulonaia mammillaris (Yen, 1952) † (basis of record)
Vetulonaia whitei C. C. Branson, 1935 † (basis of record)

 Classification

 for Unio emersoni Troxell, 1914 †

Classification doubtful, seems to be not assignable to any nominal genera or larger groups (Watters 2001). [details]

 Classification

 for Unio wilbrahamensis (B. K. Emerson, 1900) †

Classification doubtful, seems to be not assignable to any nominal genera or larger groups (Watters 2001). [details]