Leionucula rakhiensis (FOSSIL) F.E. Eames, 1951 †
Linucula recens R.K. Dell, 1956
Nuculopsis rectangula (FOSSIL) (McChesney, 1860 †)
Nucula rembangensis (FOSSIL) Martin, 1919 †
Nucula reticularis (FOSSIL) A.E. Ortmann, 1900 †
Nucula revei W. Bergmans, 1978
Nucula rhomboidea (FOSSIL) Phillips, 1848 †
Nucula rhytidopleura R.N. Kilburn, 1999
Ennucula romboides (O.A. Scarlato, 1981)
Truncacila rosaria (FOSSIL) R.L. Squires & Saul,2006 †
Nucula rossiana Finlay, 1930
Linucula ruatakiensis (FOSSIL) (J. Marwick, 1926 †)
Nucula rugulosa G.B. I Sowerby, 1833
Varinucula sagittata (FOSSIL) (H.H. Suter, 1917 †)
Austronucula salamensis (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Nuculopsis salebrosus (FOSSIL) Dembskaja, 1972 †
Nucula saltator (T. Iredale, 1939)
Ennucula sansibarensis (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Truncacila schencki (FOSSIL) Stoyanow, 1949 †
Austronucula schencki Powell, 1939
Nucula schencki L.G. Hertlein & Strong,1940
Nucula sculpturata G.B. III Sowerby, 1904
Nucula securicula (FOSSIL) Dufour, 1881 †
Nucula sedanensis (FOSSIL) Haanstra & Spiker, 1932 †
Gibbonucula seguinensis (FOSSIL) Garvie, 2013 †
Nucula semen K.H.J. Thiele& S.G.A. Jaeckel, 1931
Nucula semiornata A.V.M.D. D'Orbigny, 1842
Acila semirostrata Grant & H.R. Gale, 1931
Nucula semistriata (FOSSIL) R. Tate, 1886 †
Nucula sericea K.H.J. Thiele& S.G.A. Jaeckel, 1931
Nuculopsis setorymensis (FOSSIL) Kurushin, 1987 †
Nucula shaleri (FOSSIL) W.H. Dall, 1894 †
Truncacila shimojimensis (FOSSIL) Tashiro, 1976 †
Acila shimoyamai (FOSSIL) K. Oyama & A. Mizuno,1958 †
Nuculopsis shumardana (FOSSIL) (J.W. Hall, 1856 †)