Sassia abboti (FOSSIL) (Tenison Woods, 1876 †)
Sassia abbotti (FOSSIL) Woods, 1874 †
Sassia abbreviata (FOSSIL) (T.A. Conrad, 1848 †)
Biplex aculeata (M.M. Schepman, 1909)
Cabestana africana (A. Adams, 1855)
Biplex alanbeui (FOSSIL) M. Harzhauser, 2014 †
Monoplex amictus (L.A. Reeve, 1844)
Monoplex amictus amictoideum A.M. Keen, 1970
Ranularia andamanensis (A.G. Beu, 1987)
Ranella anglica (FOSSIL) Bell, 1871 †
Sassia angusta (FOSSIL) F. Traub, 1979 †
Sassia annectans (FOSSIL) R. Tate, 1888 †
Cymatiella ansonae (A.G. Beu, 1988)
Sassia antecedens (FOSSIL) N.H. Ludbrook, 1978 †
Charonia antiqua (FOSSIL) G.P. Deshayes, 1866 †
Ranella antiqua (FOSSIL) E.W. Vredenburg, 1921 †
Sassia apenninica (FOSSIL) (M. Sassi, 1827 †)
Monoplex aquatilis (L.A. Reeve, 1844)
Charonia aquitanicum (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1923 †
Sassia arguta (FOSSIL) (D.C. Solander, 1766 †)
Lotoria armata (G.B. III Sowerby, 1897)
Sassia armata (FOSSIL) (L.H. Hupé, 1854 †)
Sassia arthritica (FOSSIL) (Powell & J.A. Bartrum,1929 †)
Ranularia arthuri (A.G. Beu, 1987)
Charonia atavus (E. Forbes, 1846)
Ranella australasia (G. Perry, 1811)
Ranella australasia benthicola T. Iredale, 1929
Sassia balcombensis (FOSSIL) (Chapple, 1941 †)
Haurokoa bartrumi (FOSSIL) (Powell, 1938 †)
Sassia bassi (G.F. Angas, 1869)
Sassia bernayi (FOSSIL) A.E.M. Cossmann, 1889 †
Septa bibbeyi (A.G. Beu, 1987)
Sassia bicincta (FOSSIL) (G.P. Deshayes, 1835 †)
Gyrineum bituberculare (J.B.P.A. Lamarck, 1816)
Gyrineum bituberculare fuscocostata (R.W. Dunker, 1862)