Provalenciennesia langhofferi (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Lymnaea laticallosa T.N. Annandale & Surya Rao,1925
Stagnicola laurillardiana (FOSSIL) (Noulet, 1854 †)
Radix lazarevici (FOSSIL) (Š. Brusina, 1902 †)
Lymnaea lenaensis N.D. Kruglov& Y.I. Starobogatov, 1985
Myxas lessoni G.P. Deshayes, 1830
Lymnaea likharevi E.P. Lazareva, 1967
Radix lilli P. Glöer & J. Beckmann,2007
Provalenciennesia limnaeoidea (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Radix linae C.R. Altaba, 2007
Ladislavella liogyra (C.A. Westerlund, 1897)
Galba longiscata (FOSSIL) A. Brongniart, 1810 †
Galba lufengensis (FOSSIL) Pan, 1977 †
Radix luteola (J.B.P.A. Lamarck, 1822)
Radix luteola australis T.N. Annandale & Surya Rao,1925
Radix luteola ovalis Ramakrishna & A. Dey,2007
Valenciennius lutrae (FOSSIL) Taktakishvili, 1967 †
Radix lytostomopsis (FOSSIL) (Š. Brusina, 1902 †)
Lymnaea mabillei (É.A.A. Locard, 1893)
Radix macaleti (FOSSIL) T.A. Neubauer, M. Harzhauser, A. Kroh, E. Georgopoulou& O. Mandic,
Zagrabica maceki (FOSSIL) Š. Brusina, 1884 †
Pacifimyxas magadanensis (N.D. Kruglov& Y.I. Starobogatov, 1985)
Zagrabica magnifica (FOSSIL) Macale?, 2002 †
Lymnaea manomaensis N.D. Kruglov& Y.I. Starobogatov, 1984
Radix marinescui (FOSSIL) Macale?, 2000 †
Lymnaea maroccana P.M. Pallary, 1889
Lymnaea megarensis (FOSSIL) Gaudry in Gaudry& Fischer, 1867 †
Bulimnea megasoma (T. Say, 1824)
Lymnaea meridensis M.D. Bargues, P. Artigas& Mas-Coma, 2011
Valenciennius metochianus (FOSSIL) (P.S. Pavlovic, 1935 †)
Lymnaea metochina (FOSSIL) P.S. Pavlovic, 1935 †
Lymnaea middendorffi (W. Dybowski, 1904)
Stagnicola mighelsi W.G. Binney, 1865
Lymnaea mimetica T.N. Annandale, 1918
Galba minor (FOSSIL) (Thomä, 1845 †)