Eupaludestrina achaja (S. Clessin, 1879)
Tryonia acicularis (FOSSIL) Nuttall, 1990 †
Dyris acicularis (FOSSIL) Wesselingh, 2006 †
Semisalsa acilacustris (FOSSIL) Schütt, 1991 †
Tryonia adamantina D.W. Taylor, 1987
Heleobia adamsi (H.B. Preston, 1912)
Tryonia aequicostata (H.A. Pilsbry, 1889)
Tryonia alamosae D.W. Taylor, 1987
Aroapyrgus alleei J.P.E. Morrison, 1946
Tryonia allendae R. Hershler, H.P. Liu& J.J. Landye, 2011
Dyris amazonicus (F. Haas, 1949)
Littoridina andecola (A.V.M.D. D'Orbigny,1835)
Littoridina andecola culminea (A.V.M.D. D'Orbigny,1840)
Littoridina andecola neveui (A.V.M.D. D'Orbigny,1835)
Heleobia andicola (A.V.M.D. D'Orbigny,1835)
Tryonia angosturae R. Hershler, H.P. Liu& J.J. Landye, 2011
Tryonia angulata R. Hershler & D.W. Sada,1987
Littoridina angustiarum (H.B. Preston, 1915)
Littoridina apachensis W.A. Biese, 1947
Littoridina aperta (H. Hass, 1955)
Eupaludestrina aponensis (E.C. Von Martens, 1858)
Heleobia arenaria (J.R. Bourguignat, 1862)
Dyris ariei (FOSSIL) Wesselingh, 2006 †
Aphaostracon asthenes F.G. Thompson, 1968
Littoridina atacamensis R.A. Philippi
Cochliopina australis J.P.E. Morrison, 1946
Heleobia australis (A.V.M.D. D'Orbigny,1837)
Minckleyella balnearis R. Hershler, H.P. Liu& J.J. Landye, 2011
Stygopyrgus bartonensis R. Hershler & A.J. Longley,1986
Sioliella bella (FOSSIL) (T.A. Conrad, 1871 †)
Littoridina berryi (H.A. Pilsbry, 1924)
Littoridina bertoniana H.A. Pilsbry, 1911
Dyris bicarinatus (FOSSIL) Etheridge, 1879 †
Eupaludestrina bigugliana (E. Caziot, 1908)
Sioliella bisiphonata (FOSSIL) Wesselingh, 2006 †