Cylicioscapha khmeriana (FOSSIL) (Mansuy, 1914 †)
Discotropis klobukowskii (FOSSIL) (Mansuy, 1912 †)
Straparollus kokeni (FOSSIL) Spitz, 1907 †
Euomphalus konobasis (FOSSIL) Jeffery & al., 1994 †
Kiaeromphalus kristianiensis (FOSSIL) Peel & E.L. Yochelson,1976 †
Spinicharybdis krizi (FOSSIL) Rohr & al., 2008 †
Alaionema kyrgyzensis (FOSSIL) Gubanov & al., 1995 †
Nodeuomphalus labadyei (FOSSIL) (d'Archiac & de Verneuil,1842 †)
Philoxene laevis (FOSSIL) (d'Archiac & de Verneuil,1842 †)
Euomphalus latus (FOSSIL) J.W. Hall, 1858 †
Alaionema laudabilis (FOSSIL) (J. Perner, 1903 †)
Acanthonema laxa (FOSSIL) Sherzer & A.W. Grabau,1910 †
Straparollus leptoni (FOSSIL) Tassell, 1982 †
Nodeuomphalus leunissi (FOSSIL) Heidelberger & K. Bandel,1999 †
Tubiconcha leunissi (FOSSIL) (Heidelberger, 2001 †)
Euomphalus levicarinatus (FOSSIL) E.L. Yochelson, 1956 †
Straparollus levigatus (FOSSIL) Léveillé, 1835 †
Euomphalopterus limatoidea (FOSSIL) Kindle, 1903 †
Euomphalopterus liratus (FOSSIL) (T.W. Kirk, 1928 †)
Straparollus lonemountainensis (FOSSIL) Blodgett & Johnson,1992 †
Cylicioscapha longlingensis (FOSSIL) Pan, 1985 †
Hystricoceras lundgreni (FOSSIL) (Lindström, 1884 †)
Straparollus macromphalus (FOSSIL) Winchell, 1863 †
Haswellia macrothalma (FOSSIL) (Haswell †)
Euomphalopsis magnus (FOSSIL) Rohr & al., 2002 †
Straparollus magnus (FOSSIL) Kurushin, 1986 †
Straparollus mammula (FOSSIL) de Koninck, 1881 †
Euomphalus mapingensis (FOSSIL) A.W. Grabau, 1936 †
Euomphalus marginatiformis (FOSSIL) Licharev, 1967 †
Amphiscapha marginatus (FOSSIL) (d'Eichwald, 1860 †)
Euomphalopterus marklini (FOSSIL) (Lindström, 1884 †)
Poleumita mashkovae (FOSSIL) Kurushin, 1986 †
Eleutherospira medfraensis (FOSSIL) Blodgett & Johnson,1992 †
Leptomphalus micidus (FOSSIL) E.L. Yochelson, 1956 †
Phanerotinus militaris (FOSSIL) (Whidborne, 1892 †)