Bulinus abyssinicus E.C. Von Martens, 1866
Gyraulus acronicus (A.E.J. Férussac, 1807)
Gyraulus acutus S. Clessin, 1907
Planorbarius adelosius (J.R. Bourguignat, 1859)
Protancylus adhaerans P.B. Sarasin & K.F. Sarasin,1898
Ancylus aduncus A.A. Gould, 1847
Gyraulus aegaeus Willmann, 1981
Drepanotrema aeruginosum (P.M.A. Morelet, 1851)
Bulinus africanus C.F.F. von Krauss, 1848
Anisus agardhi Y.I. Starobogatovin L.A. Prozorova, 2003
Planorbis agraulus J.R. Bourguignat, 1864
Laevapex aguadae (C. Goodrich& H. Van Der Schalie, 1937)
Drepanotrema ahenum F.C. Baker, 1930
Menetus alabamensis H.A. Pilsbry, 1895
Amphigyra alabamensis H.A. Pilsbry, 1906
Gyraulus albertanus (FOSSIL) (S. Clessin, 1877 †)
Gyraulus albidus P. Radoman, 1953
Gyraulus albus (O.F. Müller, 1774)
Planorbarius alcalalensis P. Jodot, 1958
Biomphalaria alexandrina (C.G. Ehrenberg, 1831)
Glyptophysa aliciae (L.A. Reeve, 1862)
Gyraulus alienus (H. Rolle, 1862)
Polypylis almaatina Y.I. Starobogatov& Mamilova, 1970
Ancylastrum alta H.A. Pilsbry & C.E. Beecher,1927
Gyraulus altissimus (F.C. Baker, 1919)
Ancylus alutae (FOSSIL) E. Jekelius, 1932 †
Choanomphalus amauronius J.R. Bourguignat, 1862
Biomphalaria amazonica W.L. Paraense, 1966
Uncancylus ameliae H.A. Pilsbry, 1920
Planorbella ammon A.A. Gould, 1855
Gyraulus amplificatus A. Mori, 1938
Anisus amuricus L.A. Prozorova& Y.I. Starobogatov, 1998
Trochorbis anastasiae Z.I. Izzatullaev, 1973
Drepanotrema anatinum (A.V.M.D. D'Orbigny,1835)
Helisoma anceps (K.T. Menke, 1830)