Ancillus abdoi (FOSSIL) Awad & Abed, 1967 †
Alocospira abessensis (FOSSIL) P. Lozouet, 1992 †
Amalda abyssicola M.M. Schepman, 1911
Ancilla acontistes R.N. Kilburn, 1980
Ancilla acuminata (G.B. II Sowerby, 1859)
Amalda acuta T. Ninomiya, 1991
Eoancilla acutula (FOSSIL) L.W. Stephenson, 1941 †
Ancilla adelaidensis (FOSSIL) N.H. Ludbrook, 1958 †
Ancilla adelphe R.N. Kilburn, 1981
Ancilla aegyptica (FOSSIL) P. Oppenheim, 1906 †
Vanpalmeria africana (FOSSIL) O.S. Adegoke, 1977 †
Turrancilla akontistes (R.N. Kilburn, 1980)
Ancillina alazana (FOSSIL) S. Cooke, 1928 †
Amalda albanyensis T. Ninomiya, 1987
Ancillista albicans Y.C. Lee & W.L. Wu, 1997
Ancilla albisulcata (G.B. I Sowerby, 1830)
Amalda albocallosa (C.E. Lischke, 1873)
Ancilla albozonata E.A. Smith, 1904
Ancilla alcocki E.A. Smith, 1906
Micrancilla alibamasiana (FOSSIL) J.M. Pacaud, D. Merle& Pons, 2013 †
Amalda allani (FOSSIL) (Olson, 1956 †)
Amalda allaryi L. Bozzetti, 2007
Ancilla ampla (J.F. Gmelin, 1791)
Ancilla ampla cylindrica (G.B. II Sowerby, 1859)
Amalda angustata (G.B. II Sowerby, 1859)
Micrancilla antipodarum (FOSSIL) J.M. Pacaud, 2014 †
Anolacia aperta (G.B. I Sowerby, 1825)
Ancillina apicalis (E.A. Kay, 1979)
Turrancilla apicalis (T. Ninomiya, 1988)
Eburna aquaensis (FOSSIL) A.A. Olsson, 1922 †
Amalda arenaria (FOSSIL) A.E.M. Cossmann, 1889 †
Gracilispira asphaltodes (FOSSIL) (C. Beets, 1942 †)
Ancilla atimovatae Y.I. Kantor, A.E. Fedosov& al., 2016
Amalda atrebatum (FOSSIL) (Wrighley, 1940 †)
Amalda auberi (FOSSIL) A.L. Chavan, 1965 †