Nerita ascensionis chlorostoma J.B.P.A. Lamarck, 1810
Nerita ascensionis deturpensis G.J. Vermeij, 1970
Nerita ascensionis trinidadensis G.J. Vermeij, 1970
Nerita asperata (FOSSIL) F. Dujardin, 1837 †
Clithon aspersus (G.B. Sowerby, 1849)
Neripteron asperulatum (C.A. Récluz, 1842)
Theodoxus astrachanicus Y.I. Starobogatov, 1994
Nerita aterrima J.F. Gmelin, 1791
Nerita atra J.F. Gmelin, 1791
Nerita atramentosa L.A. Reeve, 1855
Theodoxus atticus (FOSSIL) Kühn, 1963 †
Neripteron auriculata (J.B.P.A. Lamarck, 1816)
Theodoxus baconi L.A. Reeve, 1856
Theodoxus baeticus J.B.P.A. Lamarck, 1822
Nereina bahiensis (C.A. Récluz, 1850)
Velates balkanicus (FOSSIL) Bontscheff, 1896 †
Nerita balteata L.A. Reeve, 1855
Theodoxus banaticus (FOSSIL) E. Jekelius, 1944 †
Bajanerita banosensis (FOSSIL) R.L. Squires & Saul,2003 †
Theodoxus barakovici (FOSSIL) (Š. Brusina, 1902 †)
Clithon barbei (FOSSIL) Symonds & J.M. Pacaud,2010 †
Amphinerita bartonensis (FOSSIL) Symonds, 2002 †
Nerita basteroti (FOSSIL) C.A. Récluz, 1850 †
Lissochilus bathonicus (FOSSIL) Cox & Arkell †
Nerita baylei (FOSSIL) Vasseur, 1881 †
Theodoxus becenensis (FOSSIL) (Cobalcescu, 1883 †)
Cryptonerita benoisti (FOSSIL) A.E.M. Cossmann, 1899 †
Puperita bensoni (C.A. Récluz, 1850)
Theodoxus bessarabicus (FOSSIL) (Sinzov, 1896 †)
Neritina bicanaliculata C.A. Récluz, 1843
Lissochilus bicinctus (FOSSIL) (Phillips) †
Clithon bicolor (C.A. Récluz, 1843)
Nerita birmanica F.H. Troschel, 1878
Nerita bisecta L.A. Reeve, 1855
Vittoclithon boettgeri (FOSSIL) (Rzehak, 1893 †)