Pseudotryonia adamantina (D.W. Taylor, 1987)
Staja adiaphora (FOSSIL) Š. Brusina, 1897 †
Leiorhagium adioincola M. Haase & S. Zielske,2015
Fluviopupa adkinsi S. Zielske & M. Haase,2014
Belgrandiella adlitzensis W. Fischer & P.L. Reischütz,1995
Tanousia adnata (FOSSIL) (M. von Neumayr in Herbich& M. von Neumayr, 1875 †)
Hydrobia adriatica S. Clessin, 1878
Belgrandiella adsharica (W.A. Lindholm, 1913)
Goniochilus aegaea (FOSSIL) (H. Schütt in H. Schütt& Besenecker, 1973 †)
Pyrgula aenigma B.M. Logvinenko& Y.I. Starobogatov, 1968
Sadleriana affinis (G.R. von Frauenfeld,1863)
Maroccopsis agadirensis M. Ghamizi, 1998
Marstonia agarhecta F.G. Thompson, 1969
Hydrobia aitai (FOSSIL) E. Jekelius, 1932 †
Josefus aitanicus B. Arconada & M.A. Ramos,2006
Saganoa akka T. Habe, 1964
Chirgisia alaarchaensis P. Glöer, H.D. Boeters& V.M. Pešic, 2014
Malaprespia albanica P. Radoman, 1973
Radomaniola albanica (P. Radoman, 1973)
Narentiana albida P. Radoman, 1973
Belgrandia alcoaensis C.R. Böttger, 1963
Cincinnatia alexander (F.G. Thompson, 2000)
Pseudamnicola algeriensis P. Glöer, S. Bouzid& H.D. Boeters, 2010
Bythiospeum algonviense (D. Uhl, 1934)
Bythiospeum allingense (S. Clessin, 1877)
Pyrgulopsis aloba R. Hershler, 1999
Belgrandiella alpestris (G.R. von Frauenfeld,1863)
Iglica alpeus A. Reischütz& P.L. Reischütz, 2004
Hydrobia alpha (FOSSIL) E. Jekelius, 1944 †
Raphica alpheus A. Reischütz& P.L. Reischütz, 2004
Bythiospeum alpinum R. Bernasconi, 1988
Hydrobia alutae (FOSSIL) E. Jekelius, 1932 †
Belgrandia alvaroi G. Holyoak, D. Holyoak& da Costa Mendes, 2017
Bythiospeum alzense H.D. Boeters, 2001
Pyrgulopsis amargosae R. Hershler, 1989