Polinices amiculatus (R.A. Philippi, 1849)
Sigaretopsis amini (FOSSIL) Awad & Abed, 1967 †
Falsilunatia amphiala (R.B. Watson, 1881)
Amauropsis anderssoni (H. Strebel, 1906)
Cryptonatica andoi S. Nomura, 1935
Natica angyglossa (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1921 †
Natica anosyensis L. Bozzetti, 2010
Euspira antarctidia (FOSSIL) J.D. Stilwell & al.,2004 †
Proxiuber anteaustrale (FOSSIL) Powell, 1938 †
Naticarius antiacca (FOSSIL) (W.P. Woodring, 1928 †)
Neverita antiqua (FOSSIL) (F. Sacco, 1890 †)
Natica antisiensis (FOSSIL) d'Orbigny, 1842 †
Natica aperta (FOSSIL) R.P. Whitfield, 1865 †
Natica apertissima E.A. Smith, 1906
Microlinices apiculus L.R.L. Simone, 2014
Amauropsis apora (R.B. Watson, 1881)
Magnatica approximata (FOSSIL) (H.H. Suter, 1917 †)
Sinum aquensis (FOSSIL) C.A. Récluz, 1843 †
Natica aquitanica (FOSSIL) R. Tournouer, 1873 †
Natica aquitanica lunata (FOSSIL) C. Mayer, 1895 †
Natica arachnoidea (J.F. Gmelin, 1791)
Amauropsina arenularia (FOSSIL) (Vasseur, 1882 †)
Tanea areolata (C.A. Récluz, 1844)
Mammilla arepa (FOSSIL) B.M. Landau & F. Da Silva,2010 †
Natica argillacea (FOSSIL) Wrigley †
Natica argus (FOSSIL) E.A.L. Kittl, 1892 †
Tejonia arroyoensis (FOSSIL) Griffin & G. Pastorino,2013 †
Naticarius articulatus (R.A. Philippi, 1852)
Neverita asagaiensis (FOSSIL) J. Makiyama, 1934 †
Glossaulax asheri (FOSSIL) E.J. Petuch, 1988 †
Tectonatica astensis (FOSSIL) (F. Sacco, 1891 †)
Proxiuber astrictum (FOSSIL) J. Marwick, 1965 †
Pliconacca atricapilla (FOSSIL) (Martin, 1884 †)
Neverita aulacoglossa (H.A. Pilsbry& E.G. Vanatta, 1909)
Polinices aurantius J.B.P.A. Lamarck, 1822