Salaputium abbreviata (FOSSIL) (R. Tate, 1886 †)
Chattina abrupta (G.B. III Sowerby, 1904)
Spissatella acculta (FOSSIL) Finlay, 1926 †
Crassinella acutus (FOSSIL) W.H. Dall, 1903 †
Crassatella adamsi (FOSSIL) J.B.P.A. Lamarck 1799 †
Nipponocrassatella adamsi (W. Kobelt, 1886)
Crassinella adamsi A.A. Olsson, 1961
Crassatella aequatorialis (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Elsius agulhasensis (S.G.A. Jaeckel& K.H.J. Thiele, 1931)
Bathytormus alaeformis (FOSSIL) (T.A. Conrad, 1830 †)
Crassatina alba R. von Cosel, 1995
Crassinella aldrichianus (FOSSIL) T.H. Aldrich, 1911 †
Crassatella alta (FOSSIL) T.A. Conrad, 1832 †
Crassatella altaspissus (FOSSIL) W.P. Woodring, 1925 †
Crassatella amaninensis (FOSSIL) Krishtofovich, 1984 †
Eucrassatella ampla (FOSSIL) (C.A. von Zittel, 1863 †)
Talabrica angustior (J.C. Verco, 1907)
Chattonia animula (FOSSIL) J. Marwick, 1929 †
Kalolophus antillarum (L.A. Reeve, 1842)
Eucrassatella aperta (FOSSIL) Devjatilova, 1981 †
Eucrassatella aphrodina (FOSSIL) (Tenison Woods, 1876 †)
Crassatella aquiana (FOSSIL) Clark, 1895 †
Crassatella astartiformis (FOSSIL) R. Tate, 1886 †
Talabrica aurora (A. Adams & G.F. Angas,1864)
Spissatella australis (FOSSIL) (F.W. Hutton, 1873 †)
Eucrassatella aviaguensis (FOSSIL) F. Hodson, 1927 †
Talabrica bellula (A. Adams, 1854)
Hybolophus berryi (FOSSIL) (E.M. Spieker, 1922 †)
Crassatella bosqueti (FOSSIL) A. von Koenen, 1893 †
Crassatina bosqueti (FOSSIL) (A. von Koenen, 1866 †)
Crassinella bowdenensis (FOSSIL) W.H. Dall, 1903 †
Crassinella bowdenensis costaricensis A.A. Olsson, 1922
Eucrassatella branneri (FOSSIL) (Waring, 1914 †)
Crassatella brasiliensis (W.H. Dall, 1903)
Crassatella bronnii (FOSSIL) M.S. Merian in Sanberger,1853 †