Amalda montrouzieri (S.M. Souverbie, 1860)
Amalda morgani (FOSSIL) (Allan, 1926 †)
Ancilla morrisoni Y.I. Kantor, A.E. Fedosov& al., 2016
Amalda mucronata (G.B. I Sowerby, 1830)
Ancilla murrayi R.N. Kilburn, 1981
Ancillista muscae (H.A. Pilsbry, 1926)
Hesperancilla mutila (FOSSIL) (White, 1887 †)
Baryspira nana (R.B. Watson, 1886)
Ancillista ngampitchae Gra-Tes, 2002
Amalda nitidanosum T. Ninomiya, 1991
Eburna nivea (W.J. Swainson, 1825)
Ancilla nonna (FOSSIL) K. Martin, 1914 †
Amalda northlandica M.R. Hart, 1995
Amalda novaezelandiae (G.B. II Sowerby, 1859)
Ancilla ntombazana (FOSSIL) L. King, 1954 †
Ancilla nuda (FOSSIL) K. Martin, 1884 †
Ancilla nysti (FOSSIL) Harmer †
Amalda obesa (G.B. II Sowerby, 1859)
Spirancilla obesula (FOSSIL) (G.P. Deshayes, 1865 †)
Amalda oblonga (G.B. I Sowerby, 1830)
Ancilla obovata (FOSSIL) A. von Koenen, 1889 †
Amalda obsoleta (FOSSIL) (G.B. Brocchi, 1814 †)
Amalda obtusa (W.J. Swainson, 1825)
Micrancilla oesiensis (FOSSIL) J.M. Pacaud, D. Merle& Pons, 2013 †
Ancilla olivaeformis (FOSSIL) Dreger, 1892 †
Ancilla olivaeformis (FOSSIL) Stefanini, 1917 †
Amalda olivula (FOSSIL) (J.B.P.A. Lamarck,1802 †)
Amalda olsoni (FOSSIL) A.G. Beu, 1970 †
Spirancilla olsoni (FOSSIL) (P.A. Maxwell, 1992 †)
Amalda opima (FOSSIL) (J. Marwick, 1924 †)
Amalda optima (G.B. III Sowerby, 1897)
Amalda oraria (FOSSIL) (Olson, 1956 †)
Ancilla ordinaria E.A. Smith, 1906
Amalda ornata (T. Ninomiya, 1988)
Alocospira orycta (FOSSIL) (R. Tate, 1889 †)