Ferrissia kirklandi B. Walker, 1903
Gyraulus kisumiensis H.B. Preston, 1912
Mioplatytaphius kittli (FOSSIL) (Rzehak, 1893 †)
Gyraulus kleini (FOSSIL) (F. Gottschick& W.A. Wenz, 1916 †)
Planorbis kochi (FOSSIL) P.S. Pavlovic, 1927 †
Anisus kolesnikovi B.M. Logvinenko& Y.I. Starobogatov, 1966
Anisus komarovae (FOSSIL) Prysjazhnjuk, 1974 †
Bulinus kormosi (FOSSIL) L. Soós, 1934 †
Choanomphalus korotnevi W.A. Lindholm, 1909
Gyraulus kosiensis P. Glöer & U. Bössneck,2013
Gyraulus kosovensis (P.S. Pavlovic, 1903)
Choanomphalus kozhovi J. Beckmann& Y.I. Starobogatov, 1975
Helicorbis kozhovi Y.I. Starobogatov& E.A. Streletzkaja, 1967
Anisus krambergeri (FOSSIL) (Halaváts, 1903 †)
Gyraulus krohi T.A. Neubauer& M. Harzhauser, 2014
Anisus kruglowiae (A.C.J. Johansen, 1937)
Planorbis kubanicus E.V. Soldatenko& Y.I. Starobogatov, 1998
Biomphalaria kuhniama (S. Clessin, 1883)
Biomphalaria kuhniana (S. Clessin, 1883)
Helicorbis kushanica Z.I. Izzatullaev, 1980
Anisus kussakini L.A. Prozorova& Y.I. Starobogatov, 1997
Menetus labiatus H.B. Baker, 1945
Gyraulus labiatus W.H. Benson, 1850
Ferrissia lacustris B. Walker, 1924
Gyraulus ladacensis (G. Nevill, 1878)
Gyraulus laevis (J. Alder, 1838)
Gundlachia lagunarum (H. Hass, 1955)
Ancylus lapicidus B. Hubendick, 1960
Segmentina lartetii (FOSSIL) (Noulet, 1854 †)
Anisus laskarevi (FOSSIL) Miloševic, 1976 †
Hebetancylus latissimus (J. Lewis, 1875)
Biomphalaria lauricocheae (R.A. Philippi, 1869)
Physastra layardi (C.M.F. Ancey)
Gyraulus lazici (Š. Brusina, 1892)
Gyraulus lenapalus (J.R. Bourguignat, 1881 )