Undulabucania gorbyi (FOSSIL) (Miller, 1892 †)
Megalomphala gotlandica (FOSSIL) Peel, 1991 †
Bucania gracillima (FOSSIL) E.F.R.K. Koken, 1896 †
Grandostoma grande (FOSSIL) (J. Perner, 1903 †)
Loxobucania gravida (FOSSIL) (Reed, 1921 †)
Bucania groenlandica (FOSSIL) Peel, 1991 †
Kokenospira guizhouensis (FOSSIL) Xi, 1974 †
Bucania halli (FOSSIL) Ulrich & Scofield, 1897 †
Phragmolites huoliensis (FOSSIL) Endo, 1935 †
Phragmolites hyperboreus (FOSSIL) Troedsson, 1928 †
Salpingostoma imbricatum (FOSSIL) Ulrich & Scofield, 1897 †
Phragmolites imbricatus (FOSSIL) F.B. Meek & A.H. Worthen,1868 †
Boiotremus incipiens (FOSSIL) (J. Perner, 1903 †)
Offleya inexpectata (FOSSIL) C.M. Poulsen, 1974 †
Kokenospira inflata (FOSSIL) (E.F.R.K. Koken, 1897 †)
Salpingostoma infundibulum (FOSSIL) Reed, 1921 †
Tremanotus inopinata (FOSSIL) (J. Perner, 1903 †)
Salpingostoma inornatum (FOSSIL) Northrop, 1939 †
Goniotremus insectus (FOSSIL) (Frech, 1894 †)
Boiotremus insignis (FOSSIL) (E.F.R.K. Koken, 1889 †)
Kokenospira insularis (FOSSIL) E.F.R.K. Koken& J. Perner, 1925 †
Salpingostoma involutum (FOSSIL) E.F.R.K. Koken& J. Perner, 1925 †
Goniotremus involutus (FOSSIL) (Frech, 1894 †)
Loxobucania katoi (FOSSIL) (T. Kobayashi, 1930 †)
Salpingostoma kentuckyense (FOSSIL) Ulrich & Scofield, 1897 †
Salpingostoma kokeni (FOSSIL) Teichert, 1932 †
Boiotremus kosovensis (FOSSIL) Horný, 1963 †
Kokenospira lateralis (FOSSIL) (d'Eichwald, 1860 †)
Kokenospira latidorsata (FOSSIL) Reed, 1921 †
Megalomphala latissima (FOSSIL) E.F.R.K. Koken, 1897 †
Salpingostoma latum (FOSSIL) Foerste, 1924 †
Loxobucania lindsleyi (FOSSIL) (Safford, 1869 †)
Phragmolites lindstroemi (FOSSIL) (E.F.R.K. Koken& J. Perner, 1925 †)
Kokenospira lingualis (FOSSIL) (Salter & Aveline,1854 †)
Salpingostoma locator (FOSSIL) (d''Eichwald, 1860 †)