Kerkia kusceri (J. Bole, 1961)
Zaumia kusceri (S. Hadžišce, 1959)
Phrantela kutikina W.F. Ponder & K.B. Clark,1993
Hydrobia kutschigi H.C. Küster
Bythiospeum labiatum (D. Geyer, 1904)
Saxurinator labiatus (H. Schütt, 1963)
Belgrandiella lacheineri (H.C. Küster, 1852)
Hydrobia lactea (H.C. Küster, 1852)
Graecoanatolica lacustristurca P. Radoman, 1973
Pseudamnicola laevigata (FOSSIL) (E. Jekelius, 1932 †)
Caspia laevigata (FOSSIL) E. Jekelius, 1944 †
Micromelania laevigata (FOSSIL) P.S. Pavlovic, 1927 †
Micromelania laevis (FOSSIL) (A. Fuchs, 1870 †)
Pyrgula laevissima (FOSSIL) C. De Stefani, 1877 †
Islamia lagari (C. Altimira, 1960)
Fluviopupa lailai S. Zielske & M. Haase,2014
Prososthenia lakonica (FOSSIL) H. Schütt, 1988 †
Fluviopupa lali M. Haase, W.F. Ponder& P. Bouchet, 2006
Fluviopupa lalinimeke M. Haase, W.F. Ponder& P. Bouchet, 2006
Pyrgula laminatocarinata (FOSSIL) (N.I. Andrusov, 1890 †)
Bythiospeum lamperti (D. Geyer, 1907)
Pyrgulopsis landyei R. Hershler, 1998
Iglica langhofferi A.J. Wagner, 1928
Micromelania lapadensis (FOSSIL) Lörenthey, 1893 †
Pyrgula laskarevi (FOSSIL) P.S. Pavlovic, 1927 †
Pyrgulopsis lasseni R. Hershler, T.J. Frest, H.P. Liu,& E.J. Johannes, 2003
Pyrgulopsis lata R. Hershler, 1998
Pseudamnicola latasteana A. Letourneux& J.R. Bourguignat, 1887
Belgrandia latina (F. Settepassi, 1965)
Islamia latina P. Radoman, 1973
Caspia latior (FOSSIL) (C.L.F. von Sandberger,1886 †)
Austropyrgus latus A. Clark, W.B. Miller& W.F. Ponder, 2003
Beddomeia launcestonensis (G. Johnston, 1872)
Socenia lauta (FOSSIL) E. Jekelius, 1944 †
Schuettemmericia lemani (FOSSIL) (B. de Basterot, 1825 †)