Leucosyrinx amycus W.H. Dall, 1919
Hindsiclava andromeda (W.H. Dall, 1919)
Crassispira angelettii L. Bozzetti, 2008
Naudedrillia angulata R.N. Kilburn, 1988
Sediliopsis angulata (FOSSIL) (Martin, 1904 †)
Crassispira angulosa (FOSSIL) (G.P. Deshayes, 1834 †)
Crassispira angulosa acyensis (FOSSIL) A.E.M. Cossmann, 1889 †
Leucosyrinx angusteplicata (H. Strebel, 1905)
Inquisitor angustiliratus A.V. Sysoev, 1996
Inquisitor angustus J.T. Kuroda, T. Habe& K. Oyama, 1971
Brachytoma annandalei (FOSSIL) E.W. Vredenburg, 1921 †
Crassispira annella (FOSSIL) W.P. Woodring, 1928 †
Crassispira ansonae (F.E. Wells, 1990)
Conorbela antarctica (H. Strebel, 1908)
Hindsiclava antealesidota (FOSSIL) (W.C. Mansfield, 1930 †)
Comitas anteridion (R.B. Watson, 1881)
Antiplanes antigone (W.H. Dall, 1919)
Lioglyphostoma antillarum (A.V.M.D. D'Orbigny,1842)
Crassispira apicata (L.A. Reeve, 1845)
Carinodrillia apitoa L.F. Corea, 1934
Hindsiclava appelii (H.C. Weinkauff& W. Kobelt, 1876)
Crassispira appressa (P.P. Carpenter, 1864)
Crassispira apta K.H.J. Thiele, 1925
Comitas arcana (E.A. Smith, 1899)
Monilispira archeri (FOSSIL) A.A. Olsson & A. Harbison,1953 †
Leucosyrinx archibenthalis (A.W.B. Powell, 1969)
Inquisitor arctatus R.N. Kilburn, 1988
Inquisitor armillatus P. Stahlschmidt& K. Fraussen, 2014
Pilsbryspira arsinoe (W.H. Dall, 1919)
Funa asra R.N. Kilburn, 1988
Crassispira aster P. Lozouet, 2015
Crassispira asthenes M.J. Faber, 2007
Otitoma astrolabensis S.G. Wiedrick, 2014
Pilsbryspira aterrima (G.B. I Sowerby, 1834)
Pilsbryspira atramentosa (E.A. Smith, 1882)