Splendrillia abdita P.J. Fallon, 2016
Drillia aberrans (FOSSIL) A. von Koenen †
Fenimorea abscondita P.J. Fallon, 2016
Splendrillia academica J.H. McLean & L.H. Poorman,1971
Drillia acapulcana (H.N. Lowe, 1935)
Agladrillia acaria (FOSSIL) (W.C. Mansfield, 1925 †)
Bellaspira acclivicosta J.H. McLean & L.H. Poorman,1970
Eumetadrillia acidna (FOSSIL) W.P. Woodring, 1970 †
Cymatosyrinx aclinica (FOSSIL) Tucker & Wilson, 1933 †
Splendrillia acostata (J.C. Verco, 1909)
Fusiturricula acra (FOSSIL) (W.P. Woodring, 1970 †)
Iredalea acuminata (J.W. Mighels, 1848)
Iredalea adenensis M. Morassi & A. Bonfitto,2013
Drillia adusta (G.B. I Sowerby, 1834)
Calliclava aegina (W.H. Dall, 1919)
Clavus aenigmaticus F.E. Wells, 1991
Splendrillia aequistriata (FOSSIL) (F.W. Hutton, 1885 †)
Drillia aerope (W.H. Dall, 1919)
Splendrillia afflicta (FOSSIL) (J. Marwick, 1931 †)
Spirotropis agamedea (W.H. Dall, 1919)
Spirotropis aganactica (R.B. Watson, 1886)
Iredalea agatha (W.H. Dall, 1918)
Clavus aglaia (W.H. Dall, 1918)
Splendrillia alabastrum R.N. Kilburn, 1988
Fenimorea alba P.J. Fallon, 2016
Splendrillia albicans (R.B. Hinds, 1843)
Clathrodrillia albicoma (W.H. Dall, 1889)
Drillia albicostata (G.B. I Sowerby, 1834)
Calliclava albolaqueata (P.P. Carpenter, 1865)
Drillia albomaculata (C.B. Adams, 1845)
Clavus albotuberculatus (M.M. Schepman, 1889)
Calliclava alcmene (W.H. Dall, 1919)
Kylix alcyone (W.H. Dall, 1919)
Drillia alcyonea J.C. Melvill & R. Standen,1901
Conopleura aliena C. Smriglio, P. Mariottini& Calascibetta, 1999