Paropeas achatinaceum (L. Pfeiffer, 1846)
Obeliscus acicularis C.G. Aguayo & M.L. Jaume,1957
Prosopeas acutissimum (A. Mousson, 1857)
Opeas adamsi H.A. Pilsbry, 1906
Nothapalus adelus M. Connolly, 1923
Riebeckia adonensis (H.H. Godwin-Austen,1881)
Obeliscus agassizi H.A. Pilsbry, 1906
Homorus alberti H.A. Pilsbry, 1919
Cryptelasmus alcaldei M.L. Jaume& Sánchez De Fuentes, 1943
Chryserpes amabilis H.A. Pilsbry, 1906
Stenogyra amazonica (H.A. Pilsbry, 1906)
Lamellaxis ambiguus (E.C. Von Martens, 1898)
Curvella amicitiae A.C. van Bruggen, 1968
Homorus amputatus H.A. Pilsbry, 1919
Prosopeas anceyi H.A. Pilsbry, 1906
Obeliscus angustatus (J. Gundlach, 1856)
Subulina angustior W.L.H. Dohrn
Leptinaria anomala (L. Pfeiffer, 1846)
Oreohomorus apio T. Wronski & B. Hausdorf,2009
Subuliniscus arambourgi J. Germain
Bocageia aratispira H.A. Pilsbry, 1905
Opeas arctispirale (P.V. Gredler, 1887)
Prosopeas argentea J. Henderson, 1898
Riebeckia arguta (E.C. Von Martens, 1881)
Leptopeas argutus (H.A. Pilsbry, 1906)
Synapterpes auratus (L. Pfeiffer, 1852)
Subulina avakubiensis H.A. Pilsbry, 1919
Curvella babaulti J. Germain, 1923
Obeliscus bacillus (L. Pfeiffer, 1861)
Rhodea barcrofti H.A. Pilsbry, 1958
Obeliscus basilissa C.G. Aguayo & M.L. Jaume,1954
Curvella bathyraphe H.A. Pilsbry& T.D.A. Cockerell, 1933
Curvella bathytoma H.A. Pilsbry, 1919
Stenogyra beckeri H.C. Fulton, 1907
Beckianum beckianum (L. Pfeiffer, 1846)