Loxoglypta secunda (V. Bertin, 1878)
Moerella securiclata (FOSSIL) P.A. Maxwell, 1992 †
Arcopagia sedgwicii (FOSSIL) (O.G. Michelotti †)
Tellina segregata (FOSSIL) W.H. Dall, 1900 †
Johnsonella seguinensis (FOSSIL) Garvie, 2013 †
Macoma sejugata (FOSSIL) (M. Yokoyama, 1924 †)
Arcopagia sellei (FOSSIL) A.E.M. Cossmann, 1886 †
Cadella semen (S.C.T. Hanley, 1845)
Macoma seminuda (FOSSIL) K.B. Barinov & al.,1992 †
Herouvalia semitexta (FOSSIL) (A.E.M. Cossmann, 1886 †)
Cadella semitorta (G.B. Sowerby, 1867)
Tellina senegalensis J.F. Gmelin, 1791
Senegona senegambiensis (A.E. Salisbury, 1934)
Tellina serica (FOSSIL) T.A. Conrad, 1848 †
Tellina sericata (J.C. Melvill, 1898)
Serratina serrata (G.B. Brocchi, 1814)
Serratina serrata subtriangula (FOSSIL) (F. Sacco, 1901 †)
Strigilla serrata O.A.L. Mörch, 1860
Tellina serricostata S. Tokunaga, 1906
Tellinella severnsi M. Huber, A. Langleit& K. Kreipl, 2015
Macoma shiratoriensis (T. Matsubara, 1994)
Tellina sieboldii G.P. Deshayes, 1855
Macoma siliqua (C.B. Adams, 1852)
Tellina simiensis (FOSSIL) R.N. Nelson, 1925 †
Tellina similis J. de C. Sowerby, 1806
Macoma simizuensis (FOSSIL) Krishtofovich, 1957 †
Pseudopsammobia simplex (G.B. III Sowerby, 1894)
Strigilla sincera (S.C.T. Hanley, 1844)
Finlayella sinuaris (FOSSIL) C.R. Laws, 1933 †
Tellina sinuata (L. Spengler, 1798)
Nelltia skidgatensis (FOSSIL) (J.J.F. Whiteaves,1884 †)
Cadella smithi (H. Lynge, 1909)
Tellina snatolensis (FOSSIL) V.N. Sinelnikova, 1991 †
Tellina soledadensis (FOSSIL) G.D. Hanna, 1927 †
Psammotreta solenella (G.P. Deshayes, 1855)