Bostryx albicans (W.J. Broderip, 1832) Chile, Caldera19,5 mm
Bulimus albidus (FOSSIL) J.B.P.A. Lamarck, 1804 † France, Picardie
Drymaeus albolabiatus (E.A. Smith, 1877) Ecuador34 mm
Mesembrinus albostriatus H. Strebel, 1882 Oaxaca, Mexico
Bostryx albus (G.B. I Sowerby, 1833) Chile, Coquimbo15 mm
Naesiotus alethorhytidus W.H. Dall, 1917 Galapagos
Drymaeus alsophilus R.A. Philippi, 1867 Peru
Drymaeus altenai A.S.H. Breure, 1976 Suriname
Rabdotus alternatus (T. Say, 1830) Mexico, Monterrey47 mm
Rabdotus alternatus mariae J.A. Albers, 1850 USA, Texas29,2 mm
Neopetraeus altoperuvianus (L.A. Reeve, 1849) Peru, Cajamarca42,11 mm
Neopetraeus altoperuvianus gracilior H.A. Pilsbry, 1898 Peru41 mm
Naesiotus altus (W.H. Dall, 1893) Mexico, Baja California
Mesembrinus amandus (L. Pfeiffer, 1855) Venezuela30 mm
Naesiotus amastroides C.M.F. Ancey, 1887 Galapagos9 mm
Drymaeus ambustus (L.A. Reeve, 1849) Ecuador29 mm
Peronaeus ameghinoi H.F.A. von Ihering, 1908 Argentina, Rio Negro21,3 mm
Peronaeus ameghinoi madrynensis (A.V.M.D. D'Orbigny,1835) Argentina, Chubut19 mm
Tocobaga americanus (FOSSIL) (A. Heilprin, 1886 †)
Drymaeus amoenus (L. Pfeiffer, 1847) Venezuela
Peronaeus anachoreta L. Pfeiffer, 1856 Chile, Caldera19,2 mm
Bostryx ancavilorum J.F. Araya, 2015
Drymaeus anceps J.A. Albers, 1854 Colombia
Drymaeus andai F.P. Jousseaume, 1898 Ecuador43,2 mm
Mesembrinus andicola (L. Pfeiffer, 1847) Bolivia
Naesiotus andivagus W.K. Weyrauch, 1956 Peru, Cajamarca15 mm
Bostryx andoicus (P.M.A. Morelet, 1863) Peru, Junin29,5 mm
Drymaeus angasi E.C. Von Martens, 1893 Costa Rica
Bostryx angiportus H.A. Pilsbry, 1932 Peru, Chagual21,53 mm
Newboldius angiportus W.K. Weyrauch, 1960 Peru, Junin
Scutalus angrandi P.M.A. Morelet, 1860 Peru44,6 mm
Drymaeus anguillensis L. Pfeiffer, 1865 Virgin Islands, Anguilla
Drymaeus angulobasis H.A. Pilsbry, 1944 Peru, Huanchaco
Drymaeus angustus S.I. Da Costa, 1906 Colombia31,5 mm
Drymaeus annulatus (L.A. Reeve, 1849) Bolivia