Crassatella inconspicuus (FOSSIL) T. Nagao, 1928 †
Indocrassatella indica (E.A. Smith, 1895)
Crassatella inglisia (FOSSIL) H.G. Richards, 1953 †
Crassatina inornata (FOSSIL) Wild & L.C. King, 1932 †
Crassatella inquirenda (FOSSIL) (Pronina, 1969 †)
Crassatella intercrenata (FOSSIL) A.E.M. Cossmann, 1905 †
Salaputium iredalei (A.W.B. Powell, 1958)
Hybolophus jamaicensis (FOSSIL) (W.H. Dall, 1903 †)
Salaputium janus (C. Hedley, 1906)
Nipponocrassatella japonica (R.W. Dunker, 1882)
Anthonya jarai (FOSSIL) Lazo & Damborenea, 2011 †
Crassinella johnsoni (FOSSIL) Ward & B.W. Blackwelder,1987 †
Bathytormus jousseaumei (É. Lamy, 1919)
Bathytormus juanadiazus (FOSSIL) (C.J. Maury, 1920 †)
Crenocrassatella jubar (L.A. Reeve, 1842)
Pachythaerus kagaharensis (FOSSIL) (Yokoyama 1890) †
Eucrassatella kakertensis (FOSSIL) V.N. Sinelnikova, 1990 †
Marvacrassatella kauffmani (FOSSIL) Ward & B.W. Blackwelder,1987 †
Eucrassatella kingicola (J.B.P.A. Lamarck, 1805)
Eucrassatella kingicoloides (FOSSIL) (G.B. Pritchard, 1903 †)
Crassatella kokeni (FOSSIL) (H.F.A. von Ihering,1897 †)
Crassatella komodai (FOSSIL) K. Oyama & A. Mizuno,1958 †
Eucrassatella kuluvensis (FOSSIL) V.N. Sinelnikova, 1990 †
Crassatina laevigata (FOSSIL) (J.B.P.A. Lamarck,1805 †)
Salaputium lamellata (FOSSIL) (R. Tate, 1886 †)
Bathytormus lamellosus (FOSSIL) (J.B.P.A. Lamarck,1805 †)
Crassatella landinensis (FOSSIL) P. Nyst, 1843 †
Crassinella lata G.W. Nowell-Usticke, 1969
Crassatella lepeltieri (FOSSIL) Dufour, 1881 †
Crassatella lincolnensis (FOSSIL) C.S. Weaver, 1916 †
Crassatella linteus (FOSSIL) (T.A. Conrad, 1860 †)
Crassatella lirasculpta (FOSSIL) D.T. Dockery, 1982 †
Crassatella longior (FOSSIL) H.F.A. von Ihering,1897 †
Crassinella lunulata (T.A. Conrad, 1834)
Spissatella luteophila (FOSSIL) J. Marwick, 1931 †