Lymnaea aberrans (C.A. Westerlund, 1897)
Acella acuaria (FOSSIL) M. von Neumayr, 1869 †
Radix acuminata (J.B.P.A. Lamarck, 1822)
Lymnaea acuminata (FOSSIL) G.P. Deshayes, 1825 †
Corymbina aegaea (FOSSIL) (P. Oppenheim, 1919 †)
Galba alberta F.C. Baker, 1919
Lymnaea almaatina Z.I. Izzatullaev, N.D. Kruglov& Y.I. Starobogatov, 1983
Radix alta (FOSSIL) Macale?, 2000 †
Lanx alta (G.W. Tryon, 1865)
Lymnaea alticola Z.I. Izzatullaev, N.D. Kruglov& Y.I. Starobogatov, 1983
Valenciennius altus (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Radix alutae (FOSSIL) (E. Jekelius, 1932 †)
Radix amaradica (FOSSIL) Macale?, 2000 †
Radix ampla J.D.W. Hartmann, 1821
Hiscerus amplectus (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Lymnaea ampullacea (E.A. Rossmässler, 1835)
Zagrabica ampullacea (FOSSIL) Š. Brusina, 1884 †
Lymnaea amurensis N.D. Kruglov& Y.I. Starobogatov, 1984
Radix andersoniana (G. Nevill, 1881)
Radix andersoniana simulans Subba Rao, 1989
Valenciennius annulatus (FOSSIL) (C. Rousseau, 1842 †)
Stagnicola apicina I. Lea, 1838
Lymnaea arachleica N.D. Kruglov& Y.I. Starobogatov, 1989
Lymnaea araratensis N.D. Kruglov& Y.I. Starobogatov, 1985
Stagnicola archangelica (N.D. Kruglov& Y.I. Starobogatov, 1986)
Stagnicola arctica (I. Lea, 1864)
Lymnaea arenularia (FOSSIL) G.P. Deshayes, 1825 †
Stagnicola armaniacensis (FOSSIL) (Noulet, 1857 †)
Stagnicola armaniacensis palustriformis (FOSSIL) (F. Gottschick, 1911 †)
Provalenciennesia arthaberi (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Ladislavella atkaensis (W.H. Dall, 1884)
Stagnicola atra (F. von Schrank, 1803)
Erinna aulacospira C.M.F. Ancey, 1889
Radix auricularia (C. Linnaeus, 1758)
Radix auricularia swinhoei A. Adams, 1866