Neritina zebra (J.G. Bruguière, 1792) Brazil, Aracaju19 mm
Vittina ziczac (J.B.P.A. Lamarck, 1816) Andaman Islands
Theodoxus zivkovici (FOSSIL) (P.S. Pavlovic, 1903 †)
Theodoxus zlatarici (FOSSIL) (Š. Brusina, 1902 †)
Theodoxus zografi (FOSSIL) (Š. Brusina, 1902 †)
Theodoxus zonarius (FOSSIL) G.P. Deshayes, 1825 † France, Paris Basin