Parthenina aemulatrix Peñas & Rolán, 2017
Odostomia aepynota W.H. Dall & P. Bartsch,1909 Mexico
Turbonilla aequalis (T. Say, 1826) Florida
Trabecula aequilibritas Peñas & Rolán, 2017
Odostomia aequisculpta P.P. Carpenter, 1864 Mexico
Odostomia aethra P. Bartsch, 1915
Parthenina affectuosa (M. Yokoyama, 1927) Japan
Chrysallida affinis (C.F. Laseron, 1959)
Turbonilla affinis (C.B. Adams, 1852) West America
Chrysallida africana J.J. Van Aartsen& J.X. Corgan, 1996
Orinella africana (P. Bartsch, 1915) South Africa5 mm
Liostomia afzelii A. Warén, 1991 France, Monaco2 mm
Miralda agana (P. Bartsch, 1915) South Africa
Syrnola aganea (P. Bartsch, 1915) South Africa
Pyramidella agassizi (H.A. Pilsbry, 1906)
Turbonilla agatha K.H.J. Thiele, 1925
Polyspirella aglaia (P. Bartsch, 1915) South Africa
Pyrgiscus agrestis (FOSSIL) T.H. Aldrich, 1911 † USA, Alabama, Choctaw
Peristichia agria W.H. Dall, 1889 Brazil, Santa Catarina3,5 mm
Turbonilla ailhaudi (E. Saurin, 1959)
Siogamaia akasakiensis S. Nomura, 1938 Japan
Menestho akkeshiensis T. Habe, 1958 Japan, Hokkaido
Pyrgiscus alacer E. Saurin, 1959
Turbonilla alarconi A.M. Strong, 1949 West America
Turbonilla alaskana W.H. Dall & P. Bartsch,1909 Alaska
Turbonilla albella A. Adams, 1861 Yellow Sea
Turbonilla albolapis (FOSSIL) (C.R. Laws, 1937 †)
Menestho albula (O. Fabricius, 1780) Norway, Kongsfjorden
Odostomia albuquerqueae A. Peñas, E. Rolán& F. Swinnen, 2014 West Africa
Parthenina alesii P. Micali, I. Nofroni& E. Perna, 2012 Greece, Kos Island
Odostomia aleutica W.H. Dall & P. Bartsch,1909 America
Odostomia alexanderi (FOSSIL) J. Marwick, 1929 †
Turbonilla alexleoni A. Peñas & E. Rolán, 2010 Solomon Islands5,5 mm
Orinella alfredensis (P. Bartsch, 1915) South Africa
Turbonilla alfredi R.T. Abbott, 1958 Caymans