Boskovicia gradata (FOSSIL) Š. Brusina, 1902 †
Radix grammica (FOSSIL) (Š. Brusina, 1872 †)
Lymnaea gueretiniana (G. Servain, 1881)
Lymnaea gundrizeri N.D. Kruglov& Y.I. Starobogatov, 1983
Valenciennius gurianus (FOSSIL) (V.V. Bogachev, 1931 †)
Lymnaea hadutkae N.D. Kruglov& Y.I. Starobogatov, 1989
Lymnaea hakusyensis N.D. Kruglov& Y.I. Starobogatov, 1989
Galba halavatsi (FOSSIL) W.A. Wenz, 1922 †
Undulotheca halavatsi (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Acella haldemani (W.G. Binney, 1867)
Radix hamadai T. Habe, 1968
Boskovicia hantkeni (FOSSIL) Lörenthey, 1893 †
Lymnaea hartmanni (S.E. Studer, 1820)
Lymnaea hawaiensis H.A. Pilsbry, 1904
Galba hendersoni F.C. Baker, 1909
Myxas hidasensis (FOSSIL) Csepreghy-Meznerics,1950 †
Stagnicola hinkleyi F.C. Baker, 1906
Austropeplea hispida (W.F. Ponder& C.O. Waterhouse, 1997)
Orientogalba hookeri (L.A. Reeve, 1850)
Lymnaea horae T.N. Annandale & Surya Rao,1925
Radix hordeum (A. Mousson, 1874)
Radix hubrechti Z.X. Qian,J. Yang & J. He, 2012
Galba humilis T. Say, 1822
Myxas huonensis J.E. Tenison-Woods, 1876
Stagnicola idahoensis J. Henderson, 1931
Lymnaea igarkae Gundrizer& Y.I. Starobogatov, 1979
Lymnaea iliensis E.P. Lazareva, 1967
Radix impressa (FOSSIL) (Sinzov, 1875 †)
Lymnaea impura (F.H. Troschel, 1837)
Lymnaea intercisa (W.A. Lindholm, 1909)
Radix iranica (T.N. Annandale& B. Prashad, 1919)
Lymnaea iturupica N.D. Kruglov& Y.I. Starobogatov, 1989
Stagnicola jaccardi (FOSSIL) (L. Maillard, 1892 †)
Lymnaea jacksonensis F.C. Baker, 1907
Lymnaea jacutica Y.I. Starobogatov& E.A. Streletzkaja, 1967