Biomphalaria andecola (A.V.M.D. D'Orbigny,1835)
Gyraulus andrussovi (A.V. Ali-Zade & Kabakova,1969 )
Kolhymorbis angarensis (W. Dybowski& J.G. Grochmalicki, 1925)
Bulinus angolensis P.M.A. Morelet, 1866
Anisus angulatus (FOSSIL) (S. Clessin, 1877 †)
Biomphalaria angulosa G. Mandahl-Barth, 1957
Segmentorbis angustus (C.F. Jickeli, 1874)
Gyraulus annandalei (J. Germain, 1918)
Choanomphalus annuliformis Kozhov, 1936
Choanomphalus anomphalus W. Dybowski, 1901
Planorbis antiquitus T.H. Aldrich, 1911
Choanomphalus aorus J.R. Bourguignat, 1860
Physastra aperta (G.B. Sowerby, 1874)
Gyraulus apertus E.C. Von Martens, 1897
Gyraulus applanatus (FOSSIL) (Thomä, 1845 †)
Biomphalaria arabica (J.C. Melvill& J.H. Ponsonby, 1896)
Gyraulus argaeicus (R. Sturany, 1904)
Ancylus armenia O. Böttger, 1881
Planorbula armigera (T. Say, 1821)
Gyraulus arminiensis (FOSSIL) E. Jekelius, 1932 †
Ancylus ashangiensis D.S. Brown, 1965
Gyraulus atkinsoni (G. Johnston, 1879)
Physastra attenuata (G.B. Sowerby, 1874)
Planorbis atticus J.R. Bourguignat, 1852
Camptoceras austeni W.T. Blanford, 1871
Bulinus australianus T.A. Conrad
Helicorbis australiensis E.A. Smith, 1882
Planorbis austroalpinus (FOSSIL) M. Harzhauser & al.,2012 †
Gyraulus avakubiensis (H.A. Pilsbry& J.C. Bequaert, 1927)
Segmentina avecenninae Z.I. Izzatullaev, 1980
Biomphalaria aymara C. Valdovinos & J. Stuardo,1991
Gyraulus bachmayeri W.R. Schlickum & F. Strauch,1979
Ferrissia baconi (J.R. Bourguignat, 1853)
Helicorbis bactriana Z.I. Izzatullaev, 1980
Glyptophysa badia (A. Adams & G.F. Angas,1864)