Acroloxus radiatulus Whiteaves, 1885 † accepted as Pseudancylus radiatulus (Whiteaves, 1885) † (additional source)
Albertanella minuta L. S. Russell, 1931 † (basis of record)
Amnicola adesta Dall, 1915 † accepted as Amnicola adestus Dall, 1915 † (basis of record)
Amnicola cretacea Stanton, 1899 † accepted as Lioplacodes cretaceus (Stanton, 1899) † (basis of record)
Amnicola expansilabris Aldrich, 1911 † (basis of record)
Amnicola omphalotropis Pilsbry, 1892 † (basis of record)
Amnicola puteana Pilsbry, 1935 † accepted as Pyrgulopsis puteana (Pilsbry, 1935) † (basis of record)
Amnicola stefanssoni Dall, 1924 † (basis of record)
Amnicola yatesiana J. G. Cooper, 1894 † accepted as Pyrgulopsis yatesiana (J. G. Cooper, 1894) † (basis of record)
Ampullaria powelli Walcott, 1883 † accepted as Reesidella powelli (Walcott, 1883) † (basis of record)
Anodonta argillensis L. S. Russell, 1932 † accepted as Anodontites argillensis (L. S. Russell, 1932) † (basis of record)
Anodonta arnoldi C. E. Weaver & K. van W. Palmer, 1922 † (basis of record)
Anodonta athlios (Mayer, 1869) † (basis of record)
Anodonta cornelliana Maury, 1902 † accepted as Elliptio cornelliana (Maury, 1902) † (basis of record)
Anodonta decurtata Conrad, 1871 † (basis of record)
Anodonta kettlemanensis Arnold, 1909 † (basis of record)
Anodonta macconnelli L. S. Russell, 1932 † accepted as Strophitus macconnelli (L. S. Russell, 1932) † (basis of record)
Anodonta malheurensis J. Henderson & Rodeck, 1934 † accepted as Gonidea malheurensis (J. Henderson & Rodeck, 1934) † (basis of record)
Anodonta nitida Nomland, 1917 † (basis of record)
Anodonta parallela C. A. White, 1878 † (basis of record)
Anodonta propatoris C. A. White, 1877 † (basis of record)
Antediplodon dewittensis W. B. Marshall, 1929 † accepted as Venustaconcha dewittensis (W. B. Marshall, 1929) † (basis of record)
Antediplodon dockumensis (C. T. Simpson, 1896) † (basis of record)
Antediplodon dumblei (C. T. Simpson, 1896) † (basis of record)
Antediplodon graciliratus (C. T. Simpson, 1896) † (basis of record)
Anthracopupa dunkardana Stauffer & Schroyer, 1920 † accepted as Anthracopupa ohioensis Whitfield, 1881 † (basis of record)
Anthracopupa ohioensis Whitfield, 1881 † (basis of record)
Aphanotylus whitei Dall, 1924 † (basis of record)
Aplexa atava (C. A. White, 1877) † (basis of record)
Aplexa disjuncta (C. A. White, 1879) † (basis of record)
Aplexa subelongata (Meek & Hayden, 1856) † (basis of record)
Assiminea aldra Dall, 1915 † (basis of record)
Batissa dubia C. A. White, 1889 † (basis of record)
Batissa newberryi C. A. White, 1889 † (basis of record)
Bisulcus undulatus Hitchcock, 1865 † (basis of record)
Bithynia arundelensis W. B. Clark, 1911 † (basis of record)
Brannerillus involutus praeposterus Pilsbry, 1934 † accepted as Brannerillus physispira Hannibal, 1912 † (basis of record)
Brannerillus involutus thremma Pilsbry, 1935 † accepted as Brannerillus physispira Hannibal, 1912 † (basis of record)
Brannerillus physispira Hannibal, 1912 † (basis of record)
Calipyrgula carinifer Pilsbry, 1934 † accepted as Tryonia carinifer (Pilsbry, 1934) † (basis of record)
Calipyrgula ellipsostoma Pilsbry, 1934 † accepted as Tryonia ellipsostoma (Pilsbry, 1934) † (basis of record)
Calipyrgula stewartiana Pilsbry, 1935 † accepted as Tryonia stewartiana (Pilsbry, 1935) † (basis of record)
Campeloma amarillensis Stanton, 1916 † accepted as Campeloma amarillense Stanton, 1916 † (basis of record)
Campeloma calamodontis T. D. A. Cockerell, 1915 † accepted as Viviparus calamodontis (T. D. A. Cockerell, 1915) † (basis of record)
Campeloma harlowtonensis Stanton, 1903 † accepted as Campeloma harlowtonense Stanton, 1903 † (basis of record)
Campeloma macrospira Meek, 1871 † (basis of record)
Campeloma nebrascense reticulatum L. S. Russell, 1931 † (additional source)
Campeloma nebrascensis (Meek & Hayden, 1856) † accepted as Campeloma nebrascense (Meek & Hayden, 1856) † (basis of record)
Campeloma nebrascensis reticulata L. S. Russell, 1931 † accepted as Campeloma nebrascense reticulatum L. S. Russell, 1931 † (additional source)
Campeloma nebrascensis whitei L. S. Russell, 1931 † accepted as Campeloma nebrascense whitei L. S. Russell, 1931 † (basis of record)
Campeloma vetulum pegmate L. S. Russell, 1934 † (basis of record)
Carinifex (Vortifex) tryoni var. ventricosa Meek, 1870 † accepted as Vorticifex binneyi ventricosa (Meek, 1870) † (basis of record)
Carinifex malheurensis J. Henderson & Rodeck, 1934 † accepted as Helisoma malheurense (J. Henderson & Rodeck, 1934) † (basis of record)
Carinifex marshalli Arnold, 1909 † accepted as Helisoma marshalli (Arnold, 1909) † (basis of record)
Carinifex sanctaeclarae Hannibal, 1909 † accepted as Helisoma sanctaeclarae (Hannibal, 1909) † (additional source)
Cassiopella turricula (C. A. White, 1876) † (basis of record)
Cepolis direpta (Dall, 1890) † (basis of record)
Cepolis instrumosa (Dall, 1890) † (basis of record)
Cepolis latebrosa (Dall, 1890) † (basis of record)
Cerion anodonta (Dall, 1890) † (basis of record)
Cerion anodonta floridanum (Dall, 1890) † (basis of record)
Cerithidea nebrascensis (Meek & Hayden, 1856) † (basis of record)
Cerithiopsis burkevillensis Dall, 1913 † (basis of record)
Cerithium fremonti J. Hall, 1845 † (basis of record)
Charydrobia stachei C. A. White, 1895 † accepted as Lioplacodes stachei (C. A. White, 1895) † (basis of record)
Corbicula (Veloritina) bannisteri Meek, 1873 † accepted as Corbicula occidentalis (Meek & Hayden, 1856) † accepted as Veloritina occidentalis (Meek & Hayden, 1856) † (source of synonymy)
Corbicula augheyi C. A. White, 1882 † accepted as Leptesthes augheyi (C. A. White, 1882) † (basis of record)
Corbicula berthoudi C. A. White, 1882 † accepted as Leptesthes berthoudi (C. A. White, 1882) † (basis of record)
Corbicula cardiniaeformis C. A. White, 1878 † (basis of record)
Corbicula cleburni C. A. White, 1878 † accepted as Veloritina cleburni (C. A. White, 1878) † (basis of record)
Corbicula cornelliana G. D. Harris, 1897 † (basis of record)
Corbicula densata (Conrad, 1843) † (basis of record)
Corbicula dowlingi McLearn, 1926 † accepted as Sphaeridium dowlingi (McLearn, 1926) † (basis of record)
Corbicula emacerata Whitfield, 1885 † (basis of record)
Corbicula fracta var. crassiuscula Meek, 1873 † (additional source)
Corbicula gabbiana J. Henderson, 1920 † (basis of record)
Corbicula macropistha C. A. White, 1878 † (basis of record)
Corbicula nebrascensis Meek & Hayden, 1860 † accepted as Corbicula intermedea (Meek & Hayden, 1856) † (basis of record)
Corbicula obesa C. A. White, 1878 † accepted as Corbicula umbonella Meek, 1875 † (basis of record)
Corbicula obliqua Whiteaves, 1885 † (basis of record)
Corbicula occidentalis (Meek & Hayden, 1856) † accepted as Veloritina occidentalis (Meek & Hayden, 1856) † (basis of record)
Corbicula planumbona Meek, 1875 † (basis of record)
Corbicula powelli C. A. White, 1876 † (basis of record)
Corbicula pugetensis C. A. White, 1889 † (basis of record)
Corbicula securis Meek, 1873 † (status source)
Corbicula sookensis (B. L. Clark & Arnold, 1923) † (basis of record)
Corbicula subelliptica (Meek & Hayden, 1856) † (basis of record)
Corbicula subelliptica moreauensis (Meek & Hayden, 1856) † (basis of record)
Corbicula umbonella Meek, 1875 † (basis of record)
Corbicula willisi C. A. White, 1889 † (basis of record)
Cyclas fragilis Meek & Hayden, 1856 † accepted as Eupera formosa (Meek & Hayden, 1856) † (source of synonymy)
Cyprina arenarea Meek & Hayden, 1857 † accepted as Corbicula arenarea (Meek & Hayden, 1857) † (new combination reference)
Cyrena (Corbicula) fracta Meek, 1871 † accepted as Leptesthes fracta (Meek, 1871) † (basis of record)
Cyrena brevidens C. A. White, 1889 † accepted as Corbicula brevidens (C. A. White, 1889) † (basis of record)
Cyrena carletoni Meek, 1873 † accepted as Corbicula carletoni (Meek, 1873) † (basis of record)
Cyrena dakotensis Meek & Hayden, 1865 † accepted as Cyrena arenarea (Meek & Hayden, 1857) † accepted as Corbicula arenarea (Meek & Hayden, 1857) † (basis of record)
Cyrena intermedea Meek & Hayden, 1856 † accepted as Corbicula intermedea (Meek & Hayden, 1856) † (additional source)
Cyrena marylandica W. B. Clark, 1911 † accepted as Corbicula marylandica (W. B. Clark, 1911) † (basis of record)
Cyrena moreauensis Meek & Hayden, 1856 † accepted as Corbicula subelliptica moreauensis (Meek & Hayden, 1856) † (status source)
Cyrenoida caloosaensis (Dall, 1896) † (basis of record)