Propebela kyurokusimana (S. Nomura & K.M. Hatai,1940)
Cytharopsis kyushuensis T. Shuto, 1965
Bactrocythara labiosa (E.A. Smith, 1872)
Mangelia labratula (FOSSIL) A.E.M. Cossmann, 1889 †
Venustoma lacunosa (A.A. Gould, 1860)
Bela laevigata (R.A. Philippi, 1836)
Obesotoma laevigata (W.H. Dall, 1871)
Guraleus lallemantianus (J.C.H. Crosse& P.H. Fischer, 1865)
Mangelia lalonis (FOSSIL) C.J. Maury, 1917 †
Eucithara lamellata (L.A. Reeve, 1846)
Glyphoturris lampra (FOSSIL) W.P. Woodring, 1928 †
Ithycythara lanceolata (C.B. Adams, 1850)
Pyrgocythara laqueata (L.A. Reeve, 1846)
Mangelia larga (FOSSIL) Scarponi & al., 2016 †
Mangelia lastica W.H. Dall, 1927
Propebela lateplicata (H. Strebel, 1905)
Heterocithara laterculus (FOSSIL) J. Marwick, 1931 †
Oenopota laticostulata A.N. Golikov& O.A. Scarlato, 1985
Mangelia latirella J.C. Melvill & R. Standen,1896
Cryoturris lavalleana (A.V.M.D. D'Orbigny,1847)
Curtitoma lawrenciana (W.H. Dall, 1919)
Fusiguraleus lawsi (FOSSIL) (A.W.B. Powell, 1942 †)
Eucithara lepidella (R.P.J. Hervier, 1897)
Fusiguraleus leptosoma (FOSSIL) (F.W. Hutton, 1885 †)
Mangelia leuca K.J. Bush, 1893
Oenopota levidensis (P.P. Carpenter, 1864)
Mangelia limata (FOSSIL) A.A. Olsson, 1922 †
Kurtziella limonitella (W.H. Dall, 1884)
Kurtziella limonitella margaritifera (FOSSIL) A.A. Olsson & A. Harbison,1953 †
Mangelia limta (FOSSIL) A.A. Olsson, 1922 †
Neoguraleus lineatus (FOSSIL) (J. Marwick, 1928 †)
Mangelia lineorosata E. Rolán & J. Otero-Schmidt,1999
Leiocithara lischkei (E.A. Smith, 1888)
Mangelia lissa (FOSSIL) J. Gardner, 1937 †
Glabrocythara locklini (FOSSIL) A.A. Olsson & A. Harbison,1953 †