Littoridinops amazonicus (FOSSIL) Wesselingh, 2006 †
Baglivia ambigua (FOSSIL) Š. Brusina, 1892 †
Islamia amiatae D. Esu & O. Girotti, 2015
Sheitanok amidicus H. Schütt & R. Sesen,1991
Caspia amnicolaeformis (FOSSIL) Roshka, 1973 †
Pseudamnicola ampla (FOSSIL) Pana, 2005 †
Pseudodianella amplior (FOSSIL) (P.S. Pavlovic, 1903 †)
Pseudamnicola anatina (J.P.R. Draparnaud)
Mercuria anatina (J.L.M. Poiret, 1801)
Pyrgulopsis anatina R. Hershler, 1998
Graecoanatolica anatolica (H. Schütt, 1965)
Islamia anatolica P. Radoman, 1973
Staja anatolica (FOSSIL) (Willmann, 1982 †)
Turkorientalia anatolica P. Radoman, 1973
Sulawesidrobia anceps S. Zielske, M. Glaubrecht& M. Haase, 2011
Guadiella andalucensis (H.D. Boeters, 1983)
Guadiella andalucesis (H.D. Boeters, 1983)
Corrosella andalusica (D. Delicado, Machordom& M.A. Ramos, 2012)
Heideella andreae W. Backhuys & H.D. Boeters,1974
Hydrobia andreaei (FOSSIL) O. Böttger, 1892 †
Caspia andrusovi (FOSSIL) P.S. Pavlovic, 1927 †
Pyrgula andrusovi (FOSSIL) P.S. Pavlovic, 1903 †
Andrusovia andrusovi Y.I. Starobogatov, 2000
Hydrobia andrussowi (FOSSIL) Hilber, 1897 †
Turricaspia andrussowi (W. Dybowski& J.G. Grochmalicki, 1915)
Austropyrgus angasi (E.A. Smith, 1882)
Belgrandiella angelovi I. Pintér, 1968
Grossuana angeltsekovi P. Glöer & D.G. Georgiev,2009
Bythiospeum anglesianum (C.A. Westerlund, 1890)
Pyrgulopsis anguina R. Hershler, 1998
Pyrgula angulata (FOSSIL) A. Fuchs, 1870 †
Beddomeia angulata W.F. Ponder & K.B. Clark,1993
Pyrgula angulataeformis (FOSSIL) E. Jekelius, 1932 †
Phrantela angulifera W.F. Ponder & K.B. Clark,1993
Marstonia angulobasis F.G. Thompson, 2005