Bucanopsis imbricatus (FOSSIL) (Weir) †
Bellerophon imperforatus (FOSSIL) Whidborne, 1892 †
Cymbularia impressa (FOSSIL) Ríha, 1936 †
Bellerophon impressus (FOSSIL) L. Waagen, 1880 †
Bellerophon incertus (FOSSIL) Loczy, 1898 †
Bellerophon incomptus (FOSSIL) Gurley, 1884 †
Sphaerocyclus iners (FOSSIL) Spitz, 1907 †
Bellerophon insculptus (FOSSIL) de Koninck, 1883 †
Bucanopsis interlineatus (FOSSIL) (Portlock, 1843 †)
Bellerophon interstrialis (FOSSIL) F. McCoy, 1847 †
Bellerophon irregularis (FOSSIL) Wang, 1980 †
Bellerophon isfarensis (FOSSIL) Licharev & Netschajev,1956 †
Khumerspira ishii (FOSSIL) Murata, 1974 †
Cymbularia janica (FOSSIL) Horný, 1963 †
Bellerophon jeffersonensis (FOSSIL) Weller, 1906 †
Waagenella jonesianus (FOSSIL) (de Koninck, 1863 †)
Joleaudella karki (FOSSIL) Öpik, 1930 †
Sphenosphaera kepinensis (FOSSIL) Yü, 1961 †
Pharkidonotus khairliensis (FOSSIL) Reed, 1944 †
Pharkidonotus khaonoiensis (FOSSIL) A. Nützel & Ketwetsuriya,2016 †
Bellerophon kingorum (FOSSIL) E.L. Yochelson, 1960 †
Cymbularia klouceki (FOSSIL) Horný, 1997 †
Aglaoglypta koeneni (FOSSIL) (A.H. Clarke, 1904 †)
Teutonophon konincki (FOSSIL) (Weir, 1931 †)
Bellerophon kyndalynensis (FOSSIL) E.K. Yoo, 1994 †
Pharkidonotus labioreflexus (FOSSIL) Sturgeon, 1964 †
Bellerophon labryrinthoides (FOSSIL) Whidborne, 1896 †
Aglaoglypta labyrinthodes (FOSSIL) (Whidborne, 1896 †)
Bellerophon lamellosus (FOSSIL) C. Gemmellaro, 1889 †
Bucanopsis latevittatus (FOSSIL) (Lindström, 1884 †)
Bellerophon laticallis (FOSSIL) Hoare & al., 1997 †
Bellerophon latisulcatus (FOSSIL) Weir, 1931 †
Bellerophon latofasciatus (FOSSIL) C.L.F. von Sandberger& C.L.F. von Sandberger, 1853 †
Sphenosphaera laurentinus (FOSSIL) (Twenhofel, 1928 †)
Bellerophon ledburiensis (FOSSIL) Reed, 1921 †