Coelocaulus karlae (FOSSIL) Rohr & al., 2003 †
Arribazona kasanensis (FOSSIL) (Netchaev, 1894 †)
Murchisonia kendalensis (FOSSIL) McCoy †
Murchisonia kirchnera (FOSSIL) Heidelberger, 2001 †
Murchisonia kokeni (FOSSIL) Wittenburg, 1908 †
Murchisonia laphami (FOSSIL) J.W. Hall, 1860 †
Arribazona lata (FOSSIL) (Netchaev, 1894 †)
Mendelia lata (FOSSIL) Frýda, 1998 †
Hormotoma latifasciatum (FOSSIL) R. Etheridge jr., 1878 †
Catazone latona (FOSSIL) J. Perner, 1907 †
Murchisonia lawlessi (FOSSIL) Cook & Camilleri, 1997 †
Coelocaulus lebescontei (FOSSIL) Oehlert & Oehlert, 1888 †
Murchisonia leda (FOSSIL) J.W. Hall, 1861 †
Mesocoelia libera (FOSSIL) J. Perner, 1907 †
Coelocaulus linearis (FOSSIL) (Billings, 1859 †)
Hormotomina linsleyi (FOSSIL) Fagerstrom, 1961 †
Altadema lira (FOSSIL) Mazaev, 2003 †
Vladanella lirata (FOSSIL) (Tyler, 1965 †)
Wuxuanella liufengshanensis (FOSSIL) Cook & Pan, 2004 †
Murchisonia lochkoviensis (FOSSIL) Frýda & Manda, 1997 †
Murchisonia lohrheimi (FOSSIL) Heidelberger, 2001 †
Arribazona longispira (FOSSIL) Mazaev, 2015 †
Coelocaulus longispira (FOSSIL) (J.W. Hall, 1852 †)
Devonocerithioides loxonemoides (FOSSIL) (Whidborne, 1892 †)
Hormotoma lutiensis (FOSSIL) Cullison, 1944 †
Vebericochlis maclayi (FOSSIL) Licharev, 1967 †
Cyrtostropha macrospira (FOSSIL) (J.W. Hall, 1852 †)
Cibecuia magnum (FOSSIL) Mazaev, 2002 †
Hormotomina maia (FOSSIL) (J.W. Hall, 1861 †)
Murchisonia margaritata (FOSSIL) Lotz, 1900 †
Vladanella mariannae (FOSSIL) Horný, 1992 †
Murchisonia marri (FOSSIL) J. Donald, 1895 †
Gyrodoma marylandica (FOSSIL) (A.H. Clarke & Swartz,1913 †)
Diplozone maturoglabra (FOSSIL) Horný 1994 †
Vebericochlis mazaevi (FOSSIL) A. Nützel & Nakazawa,2012 †