Nephronaias rugulosa (J.G.F. de Charpentierin H.C. Küster, 1856)
Quadrula rumphiana I. Lea, 1852
Ensidens sagittarius (I. Lea, 1856)
Nephronaias sajensis (L.S. Frierson, 1927)
Cyrtonaias saladoensis (I. Lea, 1860)
Lamprotula salaputium (E.C. Von Martens, 1902)
Psorula salinarum (F. Haas, 1929)
Barynaias sallei (J.C.H. Crosse& P.H. Fischer, 1893)
Pseudodon salwenianus A.A. Gould, 1844
Epioblasma sampsonii I. Lea, 1861
Actinonaias sapotalensis (I. Lea, 1841)
Cyrtonaias sapperi (H.F.A. von Ihering,1901)
Lampsilis satura I. Lea, 1852
Leguminaia saulcyi (J.R. Bourguignat, 1852)
Nephronaias scamnata (P.M.A. Morelet, 1849)
Ctenodesma scheibeneri F. Haas, 1927
Hyriopsis schlegeli (E.C. Von Martens, 1861)
Unio schoedei (F. Haas, 1930)
Ptychorhynchus schomburgianus (P.M. Heude, 1885)
Aculamprotula scripta (P.M. Heude, 1875)
Unio scrobicularioides (FOSSIL) Fric, 1869 †
Delphinonaias scutulata (P.M.A. Morelet, 1849)
Lamellidens scutum (G.B. Sowerby, 1868)
Pseudodon secundus P.M. Heude, 1877
Anodontoides securiformis (FOSSIL) McCoy †
Physunio semialatus (G.P. Deshayes& A. Jullien, 1874)
Psoronaias semigranosa (G. von dem Buschin R.A. Philippi, 1845)
Contradens semmelinki (E.C. Von Martens, 1891)
Pronodularia seomjinensis T. Kondo, H. Yang& S.H. Choi, 2007
Elliptio shepardiana I. Lea, 1834
Radiatula shurtleffiana (I. Lea, 1856)
Modellnaia siamensis R.A.M. Brandt, 1974
Acuticosta sichuanica Zeng & Y.Y. Liu, 1989
Actinonaias signata (H.A. Pilsbry, 1910)
Parreysia sikkimensis I. Lea, 1859