Amaea alistairi H.P. Wagner, 1990
Epitonium alizonum (J.C. Melvill, 1912)
Epitonium altavillensis (FOSSIL) M.E.A. de Boury †
Cirsotrema amamiense T. Nakayama, 2000
Acirsa amara R.N. Kilburn, 1985
Epitonium amathusium (J.C. Melvill & R. Standen,1903)
Hemiacirsa americana (FOSSIL) (B. Wade, 1926 †)
Epitonium amiculum R.N. Kilburn, 1985
Epitonium amicum (F.P. Jousseaume, 1894)
Amaea amoena (FOSSIL) (R.A. Philippi, 1843 †)
Epitonium amplexus T. Nakayama, 2003
Cirsotrema amplsum T. Nakayama, 2000
Epitonium anabathmos R.N. Kilburn, 1985
Plastiscala analogica (K.H. Barnard, 1963)
Epitonium ancillotoi T. Cossignani& V. Cossignani, 1998
Cylindriscala andrewsii (A.E. Verrill, 1882)
Boreoscala angulatosimile (FOSSIL) Y. Otuka, 1935 †
Cirsotrema angulatum (FOSSIL) J. Marwick, 1926 †
Epitonium angulatum T. Say, 1831
Epitonium angulicinctum (M.E.A. de Boury, 1913)
Acrilla angulifera (FOSSIL) A. von Koenen, 1891 †
Acrilla angulifera gracila (FOSSIL) Klushnikov, 1958 †
Acirsa angusta (FOSSIL) A. von Koenen, 1891 †
Epitonium angustum (R.W. Dunker, 1861)
Striatascala anlanum (FOSSIL) W.P. Woodring, 1928 †
Gregorioiscala annectens (A.W.B. Powell, 1951)
Alora annulata (J.T. Kuroda & K. Itô,1961)
Cavoscala annulata (FOSSIL) (B. Morton, 1834 †)
Acirsa antarctica (E.A. Smith, 1907)
Sthenorytis antiguense (FOSSIL) J. Brown, 1913 †
Epitonium antisoa (T. Iredale, 1936)
Amaea apexroseus E.F. Garcia, 2003
Epitonium apiculatum (W.H. Dall, 1889)
Opalia apostolorum (T. Iredale, 1936)
Amaea arabica (P. Nyst, 1871)