Cephalopoda Cuvier, 1797
Diplacmoceras Hyatt, 1903
Diplacomoceras Hyatt, 1900
Haresiceras Reeside, 1927
Hoplitoplacenticeras Paulcke, 1907
Metaplacenticeras Spath, 1926
Placentaceras Whitfield, 1892
Placentceras Clessin, 1878
Placenticeras Meek, 1876
Placentiras Peron, 1897
Placentocerus Meek, 1870
Proplacenticeras Spath, 1926
