Parmaphorella antarctica (H. Strebel, 1907)
Zeidora antarctica C. Aldea, D.G. Zelaya& J.S. Troncoso, 2011
Cranopsis antillana (I. Pérez Farfante, 1947)
Scutus antipodes Monfort, 1810
Pupillaea aperta (G.B. I Sowerby, 1825)
Emarginula apolonia J.M. Pacaud, 2015
Cranopsis apostrema L.R.L. Simone & C.M. Cunha,2014
Octomarginula arabica (A. Adams, 1852)
Fissurella aranea (FOSSIL) DeVries, 2008 †
Emarginula arconatii A. Issel, 1869
Diodora arcuata (G.B. II Sowerby, 1862)
Diodora arnoldi J.H. McLean, 1966
Cornisepta arrepiata L.R.L. Simone & C.M. Cunha,2014
Diodora aspera (J. Rathke, 1833)
Fissurella asperella G.B. I Sowerby, 1835
Cranopsis asturiana (P. Fischer, 1882)
Manganesepta atiaia L.R.L. Simone & C.M. Cunha,2014
Laevinesta atlantica (I. Pérez Farfante, 1947)
Diodora auroraensis (FOSSIL) Ward & B.W. Blackwelder,1987 †
Diodora australis (C.F.F. von Krauss, 1848)
Austriacopsis austriaca (FOSSIL) (Hornes, 1853 †)
Emarginula auversiensis (FOSSIL) G.P. Deshayes, 1861 †
Zeidora bahamondei H.A. Rehder, 1980
Macrochisma baikiei (C.B. Adams, 1855)
Macroschisma bakiei Adams, 1862
Fissurella barbadensis (J.F. Gmelin, 1791)
Fissurella barbouri I. Pérez Farfante, 1943
Tugali barnardi (J.R. le B. Tomlin, 1932)
Clathrosepta becki J.H. McLean & D.L. Geiger,1998
Stromboli beebei (L.G. Hertlein& A.M. Strong, 1951)
Scelidotoma bella (W.M. Gabb, 1865)
Emarginula bellula A. Adams, 1851
Diodora benguelensis (R.W. Dunker, 1846)
Diodora bermudensis (W.H. Dall & P. Bartsch,1911)
Fissurella bezanconi (FOSSIL) Vasseur, 1881 †