Alzoniella asturica (H.D. Boeters & E. Rolán,1988)
Pyrgula atava (FOSSIL) Š. Brusina, 1881 †
Tanousia atava (FOSSIL) (N.I. Andrusov, 1890 †)
Islamia ateni (H.D. Boeters, 1969)
Hydrobia atomaria R.A. Philippi, 1849
Hydrobia atropida (FOSSIL) Š. Brusina, 1892 †
Prososthenia attica (FOSSIL) (A. Fuchs, 1877 †)
Hydrobia aturensis (FOSSIL) (Noulet, 1854 †)
Pyrgulopsis augustae R. Hershler, 1998
Prososthenia augusti (FOSSIL) Esu & Girotti, 2001 †
Belgrandiella aulaei M. Haase, A. Weigand& H. Haseke, 2000
Pyrgulopsis aurata R. Hershler, 1998
Hydrobia aurita (FOSSIL) M. von Neumayr in M. von Neumayr& C.R.C. Paul, 1875 †
Iberhoratia aurorae B. Arconada, D. Delicado& M.A. Ramos, 2007
Belgrandiella austriana (P. Radoman, 1975)
Pyrgulopsis avernalis (H.A. Pilsbry, 1935)
Beddomeia averni W.F. Ponder & K.B. Clark,1993
Hydrobia avisanensis (FOSSIL) C.F. Fontannes, 1877 †
Austropyrgus avius A. Clark, W.B. Miller& W.F. Ponder, 2003
Grossuana aytosensis D.G. Georgiev, 2012
Islamia azarum (H.D. Boeters & E. Rolán,1988)
Euxinipyrgula azovica (A.N. Golikov& Y.I. Starobogatov, 1966)
Pseudamnicola babindolensis T.A. Neubauer, A. Kroh& al., 2015
Pseudamnicola babukici (FOSSIL) Š. Brusina, 1902 †
Pyrgula baccata (FOSSIL) Š. Brusina, 1878 †
Pyrgulopsis bacchus R. Hershler, 1988
Mercuria baccinelliana D. Esu & O. Girotti, 2015
Pseudamnicola bacescui A.V. Grossu, 1986
Belgrandiella bachkovoensis P. Glöer & D.G. Georgiev,2009
Caspia baerii (S. Clessin & W. Dybowski,1887)
Iglica bagliviaeformis H. Schütt, 1970
Stankovicia baicaliiformis (W. Polinski, 1929)
Fluviopupa bakeri S. Zielske & M. Haase,2014
Mercuria bakeri P. Glöer, H.D. Boeters& Walther, 2015
Tepalcatia bakeri (H.A. Pilsbry, 1891)