Mastoniaeforis insulana (C.F. Laseron, 1958)
Opimaphora integra C.F. Laseron, 1958
Viriola intercalaris (A.A. Gould, 1861)
Inella intercalaris B.A. Marshall, 1983
Viriola interfilata (A.A. Gould, 1861)
Viriola intergranosa (R.P.J. Hervier, 1898)
Similiphora intermedia (C.B. Adams, 1850)
Inella intermedia (W.H. Dall, 1881)
Cautor intermissus (C.F. Laseron, 1958)
Mastonia interpicta F.P. Jousseaume, 1898
Triphora interpres J.C. Melvill, 1918
Monophorus invectus (FOSSIL) M. Harzhauser, 2014 †
Viriola iredalei (C.F. Laseron, 1958)
Mastonia iris C.F. Laseron, 1958
Euthymella isaotakii S. Kosuge, 1962
Aclophora islandica C.F. Laseron, 1958
Triphora isleana C. Vélain, 1878
Mastonia issa F.P. Jousseaume, 1898
Monophorus iwaotakii (S. Kosuge, 1963)
Inella japonica J.T. Kuroda & T. Habe,1963
Cautotriphora jazwinskii S. Kosuge, 1990
Triphora johnstoni F. Baker, 1926
Mastoniaeforis jousseaumei (R.P.J. Hervier, 1898)
Nototriphora kaawaensis (FOSSIL) (C.R. Laws, 1940 †)
Subulophora kanaina (F.P. Jousseaume, 1884)
Triphora keiki E.A. Kay, 1979
Metaxia kermadecensis B.A. Marshall, 1977
Aclophora kerslakei C.F. Laseron, 1958
Latitriphora kesteveni (C. Hedley, 1903)
Inella kimblae B.A. Marshall, 1983
Euthymella kosugei B.A. Marshall, 1983
Viriola kosugei C.K. Chang & Wu, 2005
Litharium kurodai (S. Kosuge, 1962)
Cheirodonta labiata (A. Adams, 1854)
Triphora laddi E.A. Kay, 1979