Condylonucula bicornis (S. Gofas & C. Salas,1996)
Nuculoma bisulcata (FOSSIL) (Sowerby, 1850 †)
Truncacila bivirgata (FOSSIL) (Sowerby, 1836 †)
Acila blancoensis (FOSSIL) H.V.W. Howe, 1922 †
Pronucula bollonsi Powell, 1955
Nucula brasiliana C. Esteves, 1984
Nucula brevirostris (FOSSIL) Phillips, 1836 †
Acila brevis (FOSSIL) T. Nagao & Huzioka,1941 †
Nucula brewsterensis (FOSSIL) Hassan, 1953 †
Austronucula brongersmai (W. Bergmans, 1978)
Ennucula bushae (G.F. Dollfus, 1898)
Nucula cahuitensis (FOSSIL) A.A. Olsson, 1922 †
Nucula calcicola D.R. Moore, 1977
Nucula callicredemna W.H. Dall, 1890
Nucula cancellata (FOSSIL) E.W. Vredenburg, 1928 †
Nucula cancellata (FOSSIL) F.B. Meek & Hayden,1857 †
Nucula capillacea (FOSSIL) G.P. Deshayes, 1858 †
Ennucula cardara (W.H. Dall, 1916)
Nucula carlottensis (W.H. Dall, 1897)
Truncacila castagni (FOSSIL) Forner & Valls, 2012 †
Acila castrensis (R.B. Hinds, 1843)
Nucula catalina (FOSSIL) A.A. Olsson, 1930 †
Nucula certisinus Finlay, 1930
Nucula chipolana (FOSSIL) W.H. Dall, 1898 †
Nucula clavata (FOSSIL) (P. Calcara, 1841 †)
Truncacila cobboldae (FOSSIL) (J. de C. Sowerby,1817 †)
Ennucula colombiana (W.H. Dall, 1908)
Nucula compta (FOSSIL) G.A. Goldfuss, 1837 †
Nucula compta (FOSSIL) Gould, 1834 †
Lamellinucula comta (FOSSIL) (G.A. Goldfuss, 1837 †)
Nucula concinna (FOSSIL) Sowerby, 1836 †
Truncacila conradi (FOSSIL) (F.B. Meek †)
Nucula consentanea J.C. Melvill & R. Standen,1907
Ennucula convexa (Sowerby, 1833)
Nucula cooperi (FOSSIL) R.E. Dickerson, 1913 †