Nephronaias rugulosa (J.G.F. de Charpentier in H.C. Küster, 1856) Mexico
Quadrula rumphiana I. Lea, 1852 Alabama22 mm
Ensidens sagittarius (I. Lea, 1856) Thailand
Nephronaias sajensis (L.S. Frierson, 1927) Guatemala
Cyrtonaias saladoensis (I. Lea, 1860) Mexico, Vera Cruz
Lamprotula salaputium (E.C. Von Martens, 1902) Vietnam, Tonkin
Psorula salinarum (F. Haas, 1929) Guatemala
Barynaias sallei (J.C.H. Crosse& P.H. Fischer, 1893) Guatemala
Pseudodon salwenianus A.A. Gould, 1844 Myanmar, Salwen River
Epioblasma sampsonii I. Lea, 1861 Indiana
Actinonaias sapotalensis (I. Lea, 1841) Mexico, Veracruz
Cyrtonaias sapperi (H.F.A. von Ihering,1901) Guatemala
Lampsilis satura I. Lea, 1852 Louisiana, Calcasieu
Leguminaia saulcyi (J.R. Bourguignat, 1852) Libya, Tripoli
Nephronaias scamnata (P.M.A. Morelet, 1849) Cuba
Ctenodesma scheibeneri F. Haas, 1927 Malaysia, Borneo
Hyriopsis schlegeli (E.C. Von Martens, 1861) Japan
Unio schoedei (F. Haas, 1930) South China Sea, HaiNan
Ptychorhynchus schomburgianus (P.M. Heude, 1885) South China Sea, HaiNan
Aculamprotula scripta (P.M. Heude, 1875) Poyang Lake, Jiangxi, China84 mm
Unio scrobicularioides (FOSSIL) Fric, 1869 † Czech Republic, Kounic
Delphinonaias scutulata (P.M.A. Morelet, 1849) Mexico, Yucatan
Lamellidens scutum (G.B. Sowerby, 1868) Myanmar, Tenasserim
Pseudodon secundus P.M. Heude, 1877 Poyang Lake, Jiangxi, China
Anodontoides securiformis (FOSSIL) McCoy † UK, England, Westmorland
Physunio semialatus (G.P. Deshayes& A. Jullien, 1874) Vietnam, Tonkin
Psoronaias semigranosa (G. von dem Busch in R.A. Philippi, 1845) Guatemala
Contradens semmelinki (E.C. Von Martens, 1891) Vietnam, Tonkin
Pronodularia seomjinensis T. Kondo, H. Yang& S.H. Choi, 2007 South Korea, Seomjin River
Elliptio shepardiana I. Lea, 1834 USA, Georgia115 mm
Radiatula shurtleffiana (I. Lea, 1856) India, Bombay
Modellnaia siamensis R.A.M. Brandt, 1974 Thailand, Surin
Acuticosta sichuanica Zeng & Y.Y. Liu, 1989 Sichuan, China
Actinonaias signata (H.A. Pilsbry, 1910) Mexico, San Luis Potosì
Parreysia sikkimensis I. Lea, 1859 India, Assam