Enaeta isabellae (FOSSIL) C.J. Maury, 1910 †
Enaeta isabellae modesta (FOSSIL) D.T. Dockery, 1984 †
Alcithoe jaculoides A.W.B. Powell, 1924
Alcithoe jaculoides calva A.W.B. Powell, 1924
Amoria jamrachi J.E. Gray, 1864
Amoria jamrachi condei P. Bail & A. Limpus, 2001
Amoria jansae P.L. van Pel& R.G. Moolenbeek, 2010
Amoria jansae pithensis P. Bail & A. Limpus, 2011
Livonia joerinkensi (G.T. Poppe, 1987)
Paramoria johnclarki P. Bail & A. Limpus, 1997
Harpeola jugosa (FOSSIL) (Sowerby, 1839 †)
Voluta junghuhni (FOSSIL) K. Martin, 1879 †
Scaphella junonia (J.B.P.A. Lamarck, 1804)
Scaphella junonia butleri W.J. Clench, 1953
Scaphella junonia capelettii E.J. Petuch, 1994
Scaphella junonia johnstonae W.J. Clench, 1953
Notovoluta kalotinae P. Bail & A. Limpus, 2015
Fulgoraria kamakurensis (Y. Otuka, 1949)
Psephaea kaneko S. Hirase, 1922
Psephaea kaneko hayashii T. Habe & K. Itô, 1965
Psephaea kaneko itoi T. Habe, 1965
Psephaea kaneko yamamotoi T. Shikama, 1967
Fulgoraria kaoae P. Bail, 2008
Falsilyria kendrewi (FOSSIL) E.J. Petuch, 1997 †
Volutoconus keppelensis P. Bail & A. Limpus, 2013
Athleta kilburni (H.A. Rehder, 1974)
Cymbiola kimbacki P. Bail & A. Limpus, 2014
Spinomelon kingi (FOSSIL) J. Marwick, 1965 †
Alcithoe knoxi (R.K. Dell, 1956)
Fulgoraria koshibensis (FOSSIL) Y. Otuka, 1968 †
Psephaea kosibensis (FOSSIL) Y. Otuka, 1949 †
Notovoluta kreuslerae (G.F. Angas, 1865)
Notovoluta kreuslerae occulta (FOSSIL) T.A. Darragh, 1988 †
Lyria kuniene (P. Bouchet, 1979)
Callipara kurodai (R. Kawamura, 1964)