Securella kanakoffi (FOSSIL) Hertlein &Grant 1972 †
Notocallista kapitea (FOSSIL) A.G. Beu, 1970 †
Dosinia kaspiewi E. Fischer-Piette, 1967
Bassina katherinae J. Marwick, 1948
Pitar kathiewayae K.L. Lamprell& R.N. Kilburn, 1999
Pelecyora katiawarensis (E. Fischer-Piette& B. Métivier, 1971)
Macrocallista kavranensis (FOSSIL) Ilyina, 1963 †
Timoclea keegani B.K. Raines & M. Huber,2012
Lirophora kellettii (R.B. Hinds, 1845)
Tivela kelloggensis (FOSSIL) Clark & Woodford, 1927 †
Globivenus kempfi (E. Fischer-Piette& A.M. Testud, 1970)
Timoclea kendricki (FOSSIL) N.H. Ludbrook, 1978 †
Humilaria kennerleyi (L.A. Reeve, 1863)
Dorisca kilburni (J. Drivas & M. Jay,1990)
Callista kingii (J.E. Gray in P.P. King,1827)
Sunetta kirai M. Huber, 2010
Callista kitsoni (FOSSIL) R.B. Newton, 1922 †
Venus koeneni (FOSSIL) (Lienenklaus) †
Venus konkensis (FOSSIL) Sokolov †
Lioconcha kovalisi R. De Prins, 2013
Macrocallista kovatschensis (FOSSIL) Krishtofovich, 1947 †
Paphia kreipli M. Huber, 2010
Cyclinella kroeyeri (R.A. Philippi, 1847)
Pitar kryshtofovichii (FOSSIL) V.N. Sinelnikova, 1991 †
Dosinia kuiperi E. Fischer-Piette& D. Delmas, 1967
Flaventia kukpowrukensis (FOSSIL) Imlay, 1961 †
Aphrodora kurodai (T. Matsubara, 2007)
Kyrina kyrina F.P. Jousseaume, 1894
Dosinia labiosa A. Römer, 1862
Lamelliconcha labreana (FOSSIL) C.J. Maury, 1912 †
Antigona lacerata (S.C.T. Hanley, 1845)
Leukoma laciniata (P.P. Carpenter, 1864)
Pitar laetus (G.S. Poli, 1791)
Timoclea laevicostata J.T. Kuroda, 1960
Tivela laevigata (J.E. Gray, 1838)