Pyrgulopsis aardahli R. Hershler, 1989
Hydrobia abbreviata (FOSSIL) (J.P.S. Grateloup,1827 †)
Caspia abbreviata (FOSSIL) Roshka, 1973 †
Belgrandiella abchasica Y.I. Starobogatov, 1962
Austropyrgus abercrombiensis A. Clark, W.B. Miller& W.F. Ponder, 2003
Turricaspia aberrans (FOSSIL) (N.I. Andrusov, 1890 †)
Pyrgula abichi B.M. Logvinenko& Y.I. Starobogatov, 1968
Bythiospeum abnobae (D. Geyer, 1905)
Sulawesidrobia abreui S. Zielske, M. Glaubrecht& M. Haase, 2011
Iglica absoloni (A.J. Wagner, 1914)
Pseudamnicola abxazica (FOSSIL) Badzoshvili, 1979 †
Pyrgulopsis acarinatus (R. Hershler, 1985)
Prososthenia acarnanica (FOSSIL) Schütt, 1986 †
Fonscochlea accepta W.F. Ponder, R. Hershler& B.W. Jenkins, 1989
Hydrobia accrensis M. Connolly, 1929
Goniochilus achaiae (FOSSIL) D. Esu & O. Girotti,2015 †
Hydrobia acheila (FOSSIL) Š. Brusina, 1902 †
Beddomeia acheronensis W.F. Ponder & K.B. Clark,1993
Bythiospeum acicula (F. Held, 1838)
Socenia acicula (FOSSIL) (Š. Brusina, 1892 †)
Pyrgula acicula A. Reischütz& P.L. Reischütz, 2002
Iglica acicularis A.M. Angelov, 1959
Pyrgula aciculata (FOSSIL) P.S. Pavlovic, 1932 †
Hydrobia aciculina (J.R. Bourguignat, 1876)
Bythiospeum aciculoides (S. Clessin, 1909)
Goniochilus acmaeformis (FOSSIL) (P.S. Pavlovic, 1927 †)
Vrazia acme (FOSSIL) Š. Brusina, 1897 †
Jardinella acuminata W.F. Ponder & K.B. Clark,1990
Prososthenia acuminata (FOSSIL) P.S. Pavlovic, 1927 †
Belgrandia acuta (FOSSIL) (C. De Stefani, 1877 †)
Hydrobia acuta (J.P.R. Draparnaud, 1805)
Hydrobia acuta neglecta B.J. Muus, 1963
Hydrobia acutecarinata (FOSSIL) M. von Neumayr in M. von Neumayr& C.R.C. Paul, 1875 †
Staja acutecarinata (FOSSIL) Š. Brusina, 1902 †
Pyrgula acuticarinata (FOSSIL) P.S. Pavlovic, 1932 †