Barbatia rhomboidella (FOSSIL) (Lea, 1833 †)
Barbatia rigaultiana (FOSSIL) G.P. Deshayes, 1858 †
Cunearca riocanensis (FOSSIL) C.J. Maury, 1917 †
Anadara riogurabonica (FOSSIL) C.J. Maury, 1917 †
Acar rostae (S.S. Berry, 1954)
Acar rostrae S.S. Berry, 1954
Anadara rotundicostata (L.A. Reeve, 1843)
Deltaodon rubrotincta (J.T. Kuroda& T. Habe in T. Habe, 1958)
Anadara rufescens (L.A. Reeve, 1844)
Anadara rugifera (R.W. Dunker, 1866)
Anadara rustica (FOSSIL) M. Tuomey & F.S. Holmes,1857 †
Scapharca rustica (FOSSIL) Martin, 1883 †
Anadara sabinae (L.J. Morlet, 1889)
Barbatia sabuletorum (FOSSIL) G.P. Deshayes, 1858 †
Asperarca sagrinata (W.H. Dall, 1886)
Arca sakamizuensis (FOSSIL) K.M. Hatai & S. Nisiyama,1952 †
Anadara saladillaensis (FOSSIL) F. Hodson & al., 1927 †
Arca salomonensis (FOSSIL) C. Gemmellaro, 1896 †
Arca sandbergeri (FOSSIL) G.P. Deshayes, 1860 †
Acar sandersonae Powell, 1933
Scapharca sansebastiana (FOSSIL) L.G. Sheldon & C.J. Maury,1920 †
Anadara santana (FOSSIL) Loel & Corey, 1932 †
Anadara santarosana (FOSSIL) W.H. Dall, 1898 †
Anadara sativa (F.R. Bernard, Y.Y. Cai& F. Morton, 1993)
Anadara satowi (R.W. Dunker, 1882)
Anadara satowi castellata (FOSSIL) M. Yokoyama, 1923 †
Mimarcaria saviolum T. Iredale, 1939
Barbatia scabrosa (FOSSIL) (P. Nyst, 1848 †)
Cunearca scalarina (FOSSIL) (A. Heilprin, 1887 †)
Cunearca scalaris (FOSSIL) (T.A. Conrad, 1844 †)
Barbatia scazon (T. Iredale, 1939)
Barbatia sculptata (FOSSIL) (G.P. Deshayes, 1829 †)
Barbatia sculptata? (G.P. Deshayes, 1829)
Barbatia sculptilis (L.A. Reeve, 1844)
Barbatia sculpturata W.H. Turton, 1932