Phacoides naviculus (FOSSIL) A.E.M. Cossmann, 1905 †
Schafhaeutlia nebulosa (FOSSIL) Kurushin, 1992 †
Lucina neglecta (FOSSIL) A.E. Ortmann, 1902 †
Pillucina neglecta T. Habe, 1960
Epicodakia neozelanica A.W.B. Powell, 1937
Miltha neozelanica (FOSSIL) P. Marshall & R. Murdoch,1921 †
Fimbria neptuni (FOSSIL) J. Lycett †
Lucina neuquensis (FOSSIL) Haupt, 1907 †
Miltha neuvillei (FOSSIL) Author unknown †
Loripes niveus (FOSSIL) (K.E.I. von Eichwald,1830 †)
Pseudomiltha nocariensis (FOSSIL) Kellum, 1926 †
Epicodakia nodulosa E.A. Glover & D.W. Taylor,2007
Pseudomiltha nokbaensis (FOSSIL) (Oppenheim 1903) †
Loripinus norregaardi (FOSSIL) Sorgenfrei, 1958 †
Lucina nuciformis (FOSSIL) R. Tate, 1886 †
Lucinisca nuttalli (T.A. Conrad, 1837)
Pteromyrtea obesa (FOSSIL) Finlay & J. Marwick,1937 †
Myrtea obesula A. Adams, 1862
Monitilora obliqua (FOSSIL) (J.L.M. Defrance, 1823 †)
Epicodakia obliquata M. Huber, 2015
Bulacanites obtusiplicatus (FOSSIL) T. Kase & Aguilar, 2006 †
Pseudomiltha ocalanus (FOSSIL) W.H. Dall, 1903 †
Divaricella occidua (B.C. Cotton& F.C. Godfrey, 1938)
Lucina oculus (FOSSIL) C.H. Blake & W.H. Hudleston †,
Plastomiltha odontota (FOSSIL) W.P. Woodring, 1982 †
Lepidolucina odontotis (A.E. Salisbury, 1934)
Callucina olea (FOSSIL) Vokes 1946 †
Lamellolucina oliveri D.W. Taylor & E.A. Glover,2002
Fimbria olssoni (FOSSIL) H.G. Richards, 1953 †
Pegophysema omaliusi (FOSSIL) (G.P. Deshayes, 1858 †)
Megaxinus omanensis (E.A. Smith, 1906)
Cavatidens omissa T. Iredale, 1930
Sphaeriola oolithica (FOSSIL) (Rollier †)
Divaricella oppenheimi (FOSSIL) R.B. Newton, 1922 †
Codakia orbicularis (C. Linnaeus, 1758)