Emarginula abnormis (FOSSIL) Stoppani, 1858 †
Puncturella abyssicola A.E. Verrill, 1885
Amblychilepas acra (FOSSIL) B.C. Cotton, 1947 †
Cornisepta acuminata (R.B. Watson, 1883)
Emarginula adamsiana G.B. II Sowerby, 1863
Emarginula adriatica A. da Costa, 1830
Lucapina adspersa (R.A. Philippi, 1845)
Lucapina aegis (L.A. Reeve, 1850)
Lucapinella aequalis (G.B. I Sowerby, 1835)
Rimula aequisculpta W.H. Dall, 1927
Puncturella aethiopica (E.C. Von Martens, 1902)
Fissurella afra J.R.C. Quoy & J.P. Gaimard,1834
Cosmetalepas africana (J.R. le B. Tomlin, 1926)
Macroschisma africanum J.R. le B. Tomlin, 1932
Cranopsis agger (R.B. Watson, 1883)
Diodora aguayoi I. Pérez Farfante, 1943
Clathrosepta agulhasae (A.H. Clarke, 1961)
Emarginula agulhasensis K.H.J. Thiele, 1925
Fissurella alabastrites L.A. Reeve, 1849
Cranopsis alaris L.R.L. Simone & C.M. Cunha,2014
Emarginula alba R.B. Watson, 1897
Profundisepta alicei (P. Dautzenberg& H. Fischer, 1897)
Diodora alta (C.B. Adams, 1852)
Fissuridea alticosta (FOSSIL) (T.A. Conrad, 1834 †)
Altrix altior (FOSSIL) (Meyer & T.H. Aldrich,1886 †)
Diodora alumensis (FOSSIL) (W.C. Mansfield, 1930 †)
Nesta amamiensis (FOSSIL) (T. Habe, 1963 †)
Emarginula amyda T. Shikama, 1962
Scutus anatinus (E. Donovan, 1820)
Emarginula angusta J.H. McLean, 1970
Cremides angusta (J.F. Gmelin, 1789)
Cornisepta aninga L.R.L. Simone & C.M. Cunha,2014
Monodilepas annulata (FOSSIL) (H.H. Suter, 1917 †)
Pupillaea annulus (N.H. Odhner, 1932)
Cornisepta antarctica (E.N. Egorova, 1972)