Neritoma gea (FOSSIL) Morris 1949 †
Nerita gemmulata L.A. Reeve, 1857
Clithon glabratum (G.B. II Sowerby, 1849)
Nerita glaucina C. Linnaeus, 1758
Nerita globosa (FOSSIL) R.A. Philippi, 1855 †
Neritodryas globosa (FOSSIL) J. de C. Sowerby, 1823 †
Theodoxus gloeri D.A. Odabasi & Arslan,2015
Theodoxus gnezdai (FOSSIL) (Š. Brusina, 1884 †)
Nerita gouetensis (FOSSIL) Symonds & J.M. Pacaud,2010 †
Neritina granosa G.B. I Sowerby, 1825
Nerita granulosa (FOSSIL) G.P. Deshayes, 1824 †
Nerita grasi T.C. Eichhorst, 2016
Theodoxus grateloupianus (FOSSIL) (A.E.J. Férussac, 1823 †)
Theodoxus gregarius (FOSSIL) (Thomä, 1845 †)
Nerita grisea L.A. Reeve, 1855
Nerita grossa C. Linnaeus, 1758
Theodoxus groyanus (FOSSIL) (A.E.J. Férussac, 1823 †)
Theodoxus guadianensis M.de la Paz Graells, 1846
Nerita guamensis J.R.C. Quoy & J.P. Gaimard,1834
Neripteron guerini (C.A. Récluz, 1841)
Neritodryas guillioui (FOSSIL) Symonds & J.M. Pacaud,2010 †
Nerita hadra (FOSSIL) W.P. Woodring, 1973 †
Theodoxus heldreichi (E.C. Von Martens, 1879)
Nerita helicinoides L.A. Reeve, 1855
Nerita helicinoides laevilabris (H.A. Pilsbry, 1895)
Nerita helicinoides martensiana (H.A. Pilsbry, 1901)
Theodoxus hellenicus (FOSSIL) (Bukowski, 1896 †)
Clithon hillae Symonds, 2015
Theodoxus hisingeri (FOSSIL) (L.M.D. Bellardi& O.G. Michelotti, 1841 †)
Theodoxus hispalensis (E.C. Von Martens, 1879)
Theodoxus hoernesanus (FOSSIL) (C.G. Semper, 1867 †)
Pseudonerita holoserica (A. Garrett, 1872)
Pseudonerita holosericea (A. Garrett, 1872)
Theodoxus imbricatus (FOSSIL) (Š. Brusina, 1878 †)