Pseudorhaphitoma iodolabiata (A. Hornung & G. Mermod,1929)
Mangelia isabellae (FOSSIL) C.J. Maury, 1910 †
Ithycythara ischna (FOSSIL) W.P. Woodring, 1928 †
Tenaturris isiola (FOSSIL) W.P. Woodring, 1928 †
Mangelia isodoma R.P.J. Hervier, 1897
Eucithara isophanes (R.P.J. Hervier, 1897)
Eucithara isseli (G. Nevill & H. Nevill,1875)
Guraleus jacksonensis (G.F. Angas, 1877)
Tenaturris janira (W.H. Dall, 1919)
Obesotoma japonica P. Bartsch, 1941
Mangelia jerbaensis G. Della Bella& G. Spada in C. Chirli, 1997
Pyrgocythara juliocesari R. Fernández-Garcés& E. Rolán, 2010
Oenopota kagana (FOSSIL) M. Yokoyama, 1927 †
Oenopota kakumensis N. Onoyama, 1938
Guraleus kamakuranus (H.A. Pilsbry, 1904)
Oenopota kazusensis (S. Nomura, 1940)
Bela keepingi (FOSSIL) (Etheridge & Bell,1898 †)
Ithycythara kellumi (FOSSIL) A.A. Olsson & A. Harbison,1953 †
Kurtzia kilburni (FOSSIL) C. Nielsen, 2003 †
Pseudorhaphitoma kilburni M. Morassi & A. Bonfitto,2001
Antiguraleus kingensis (W.F. Petterd, 1879)
Oenopota kinkasanensis A.N. Golikov & V.V. Gulbin,1977
Agathotoma kirshi E. Rolán, R. Fernández-Garcés& C. Redfern, 2012
Agathotoma klasmidia D.R. Shasky, 1971
Mangelia klimakota (FOSSIL) J. Gardner, 1937 †
Bela koeneni (FOSSIL) (A.E.M. Cossmann& A. Lambert, 1884 †)
Oenopota komakahida (K. Otsuka, 1949)
Oenopota koreni (H.B.S. Friele, 1886)
Mangelia kowiensis W.H. Turton, 1932
Granotoma krausei (W.H. Dall, 1887)
Mangelia kraussi W.H. Turton, 1932
Oenopota kurilensis I.P. Bogdanov, 1989
Neoguraleus kutekinensis (FOSSIL) F.S. MacNeil, 1960 †
Notocytharella kwangdangensis (M.M. Schepman, 1913)
Oenopota kyskana W.H. Dall, 1919