Costacallista laevigata (FOSSIL) (J.B.P.A. Lamarck,1806 †)
Callocardia laevis (J.P.L. Pelseneer, 1903)
Tawera lagopus (J.B.P.A. Lamarck, 1818)
Lajonkairia lajonkairii (B.C.M. Payraudeau, 1826)
Meretrix lamarcki (FOSSIL) (A.E.R. Agassiz, 1845 †)
Meretrix lamarckii G.P. Deshayes, 1853
Dosinia lambata (A.A. Gould, 1850)
Periglypta lamberti (FOSSIL) (G.P. Deshayes, 1857 †)
Artena lamellacea (FOSSIL) Kellum, 1926 †
Antigona lamellaris H.C.F. Schumacher, 1817
Placamen lamellatum (P.F. Röding, 1798)
Placamen lamellatum calophyllum (R.A. Philippi, 1846)
Irusella lamellifera (T.A. Conrad, 1837)
Placamen lamellosum (G.B. I Sowerby, 1825)
Dosinia laminata (L.A. Reeve, 1850)
Lioconcha lamprelli R.G. Moolenbeek, H. Dekker& S.E.T. Van der Meij, 2008
Dosinia lamyi E. Fischer-Piette& D. Delmas, 1967
Tivela lamyi P. Dautzenberg, 1929
Mercenaria langdoni (FOSSIL) W.H. Dall, 1900 †
Timoclea langfordi (J.T. Kuroda, 1945)
Sunetta langfordi (T. Habe, 1953)
Petricola lapicida (J.F. Gmelin, 1791)
Petricola lapicida divergens (J.F. Gmelin, 1791)
Antigona laqueata (G.B. II Sowerby, 1853)
Venerupis largillierti (R.A. Philippi, 1847)
Tawera laticostata (N.H. Odhner, 1917)
Venerupis latidactylus (FOSSIL) Muller & Collins, 1991 †
Lirophora latilirata (T.A. Conrad, 1841)
Bassina lawsi C.A. Fleming, 1971
Timoclea layardi (L.A. Reeve, 1864)
Dosinia lechuzaensis (FOSSIL) Rivera, 1957 †
Costacallista leiotera (FOSSIL) W.P. Woodring, 1982 †
Paraesa lens (FOSSIL) (W.M. Gabb, 1864 †)
Dosinia lenticularis E. Forbes, 1846
Dosiniopsis lenticularis (FOSSIL) (B. Rogers, 1838 †)