Gadila aberrans (J.J.F. Whiteaves, 1887)
Gadila abruptoinflata (M. Boissevain, 1906)
Gadila acuminata (R. Tate, 1887)
Cadulus acuminatus (FOSSIL) R. Tate, 1887 †
Siphonodentalium adelaidense (FOSSIL) N.H. Ludbrook, 1956 †
Gadila aequalis (W.H. Dall, 1881)
Cadulus aequatorialis S.G.A. Jaeckel, 1932
Gadila agassizii (W.H. Dall, 1881)
Striocadulus albicomatus (W.H. Dall, 1890)
Gadila amianta (W.H. Dall, 1889)
Cadulus amphora J.G. Jeffreys, 1883
Cadulus ampullaceus R.B. Watson, 1879
Polyschides andersoni K.L. Lamprell & J.M. Healy,1998
Gadila anguidens (J.C. Melvill & R. Standen,1898)
Gadila angustior (J.C. Verco, 1911)
Cadulus aratus C. Hedley, 1899
Calstevenus arcturus (FOSSIL) Yancey, 1973 †
Gadila arctus (J. Henderson, 1920)
Polyschides arnaudi V. Scarabino, 1995
Polyschides arnoensis (FOSSIL) P.A. Maxwell, 1992 †
Cadulus artatus É.A.A. Locard, 1897
Cadulus atavus (FOSSIL) Finlay & J. Marwick,1937 †
Gadila atlantica (J. Henderson, 1920)
Cadulus atlanticus J. Henderson, 1920
Dischides atlantideus (M. Nicklés, 1955)
Cadulus attenuatus T.A. de M. Monterosato,1875
Gadila austinclarki (W.K. Emerson, 1951)
Siphonodentalium australasiae M. Boissevain, 1906
Dischides belcheri H.A. Pilsbry & B. Sharp,1898
Dischides belenae V. Scarabino, 2008
Cadulus bellulus (FOSSIL) Clark, 1895 †
Gadila benoisti (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1916 †
Gadila benoisti houthalensis (FOSSIL) (Goddeeris, 1977) †
Dischides bilabiata (FOSSIL) (G.P. Deshayes, 1861 †)
Siphonodentalium bilabiatum (FOSSIL) A.E.M. Cossmann, 1903 †