Cerithium abbas (FOSSIL) W.H. Hudleston, 1889 †
Cerithium abbreviatum (FOSSIL) J. Leckenby, 1859 †
Cerithium abditum R.S. Houbrick, 1992
Tenuicerithium absonun (FOSSIL) R.C. Hoerle, 1972 †
Cassiella abylensis S. Gofas, 1987
Cerithidium actinium H.A. Rehder, 1980
Cerithium acuticosta (FOSSIL) O.G. Michelotti, 1861 †
Caloosalba adamsii (FOSSIL) (W.H. Dall, 1889 †)
Cerithium adelomorphus (FOSSIL) A.E.M. Cossmann, 1897 †
Clypeomorus admirabilis R.S. Houbrick, 1985
Clypeomorus adunca (A.A. Gould, 1849)
Cerithium adustum L.C. Kiener, 1841
Bittium aedonium (R.B. Watson, 1880)
Bittium aeolomitres J.C. Melvill & R. Standen,1896
Alabina africana P. Bartsch, 1915
Cerithium africanum R.S. Houbrick, 1992
Cerithium agervallensis (FOSSIL) Dominici & T. Kowalke,2014 †
Hemicerithium akriton (FOSSIL) R.C. Hoerle, 1972 †
Bittium alabastrulum (O.A.L. Mörch, 1876)
Rhinoclavis alajuela (FOSSIL) A.A. Olsson, 1922 †
Clypeomorus alasaensis (FOSSIL) G.G. Wissema, 1947 †
Cerithium albolineatum L. Bozzetti, 2008
Rhinoclavis alexandri (J.R. le B. Tomlin, 1923)
Alabina alfredensis P. Bartsch, 1915
Bittiolum alternatum (T. Say, 1822)
Cerithium alucastrum (G.B. Brocchi, 1814)
Cerithium alucastrum subnodosum A. Adams, 1855
Cerithium alucastrum subnodosum ponticum K.O. Milaschewitsch, 1908
Cerithium aluchense G.D. Chiereghini, 1847
Pseudovertagus aluco (C. Linnaeus, 1758)
Bittium alutaceum A.A. Gould, 1861
Bittium alutaceum numamuranum (FOSSIL) M. Yokoyama, 1924 †
Bittium amboynense (R.B. Watson, 1881)
Cerithium amirantium E.A. Smith, 1884
Rhinoclavis ampullosa (FOSSIL) (Bronginiart, 1823 †)