Cerithium abbas (FOSSIL) W.H. Hudleston, 1889 † UK, Dorset
Cerithium abbreviatum (FOSSIL) J. Leckenby, 1859 † UK, Yorkshire
Cerithium abditum R.S. Houbrick, 1992 Indonesia17 mm
Tenuicerithium absonun (FOSSIL) R.C. Hoerle, 1972 † Florida
Cassiella abylensis S. Gofas, 1987 Spain2 mm
Cerithidium actinium H.A. Rehder, 1980 Hawaii, Oahu
Cerithium acuticosta (FOSSIL) O.G. Michelotti, 1861 †
Caloosalba adamsii (FOSSIL) (W.H. Dall, 1889 †)
Cerithium adelomorphus (FOSSIL) A.E.M. Cossmann, 1897 † France, Brittany7 mm
Clypeomorus admirabilis R.S. Houbrick, 1985 Australia, Broome20,4 mm
Clypeomorus adunca (A.A. Gould, 1849) Philippines12 mm
Cerithium adustum L.C. Kiener, 1841 Galapagos41 mm
Bittium aedonium (R.B. Watson, 1880) Philippines, Mactan Island
Bittium aeolomitres J.C. Melvill& R. Standen, 1896 Philippines, Mactan Island
Alabina africana P. Bartsch, 1915 Japan
Cerithium africanum R.S. Houbrick, 1992 Zanzibar Island
Cerithium agervallensis (FOSSIL) Dominici & T. Kowalke,2014 † Spain
Hemicerithium akriton (FOSSIL) R.C. Hoerle, 1972 † Florida
Bittium alabastrulum (O.A.L. Mörch, 1876) Philippines, Mactan Island
Rhinoclavis alajuela (FOSSIL) A.A. Olsson, 1922 † Costa Rica, Limón, Talamanca
Clypeomorus alasaensis (FOSSIL) G.G. Wissema, 1947 †
Cerithium albolineatum L. Bozzetti, 2008 Madagascar, Lavanono5 mm
Rhinoclavis alexandri (J.R. le B. Tomlin, 1923) South Africa39,6 mm
Alabina alfredensis P. Bartsch, 1915 South Africa, Port Alfred
Bittiolum alternatum (T. Say, 1822) USA. Virginia
Cerithium alucastrum (G.B. Brocchi, 1814) Italy, Livorno74 mm
Cerithium alucastrum subnodosum A. Adams, 1855 Greece, Evia Island28 mm
Cerithium alucastrum subnodosum ponticum K.O. Milaschewitsch, 1908 Greece, Evia Island38 mm
Cerithium aluchense G.D. Chiereghini, 1847 Mediterranean Sea
Pseudovertagus aluco (C. Linnaeus, 1758) Philippines, Samar Island66 mm
Bittium alutaceum A.A. Gould, 1861 Philippines, Mactan Island6 mm
Bittium alutaceum numamuranum (FOSSIL) M. Yokoyama, 1924 † Japan, Chiba
Bittium amboynense (R.B. Watson, 1881) France, Paris Basin
Cerithium amirantium E.A. Smith, 1884
Rhinoclavis ampullosa (FOSSIL) (Bronginiart, 1823 †) Greece, Epirus and Western Macedonia