Kingdom Protista (Haeckel, 1866) - protists
   Division Chrysophyta see Phylum Chrysophyta Pascher (1914)
     Class Coccolithophyceae Rothm. (1951)
       Genus †Annulithus A.P. Rood et al., in T. Barnard & W.W. Hay (1974)
       Genus †Bipodorhabdus Noel (1970) see Genus Amphizygus Bukry (1969)
       Genus Braarudosphaera Deflandre (1947)
       Genus †Broinsonia Bukry (1969)
       Genus †Catinaster E. Martini & Bramlette, 1963
       Genus Ceratolithus Kamptner (1950)
       Genus †Chiasmolithus W.W. Hay, H. Mohler & M. Wade (1966)
       Genus †Conusphaera Trejo, 1969
       Genus †Corolithion
       Genus †Crepidolithus Noel (1965)
       Genus Cricosphaera Braarud (1960) see Genus Pleurochrysis E.G. Pringsheim (1955)
       Genus †Cruciplacolithus Hay & Mohler
       Genus †Crucirhabdus Prins ex Rood, Hay & Barnard (1973)
       Genus Cyclococcolithina J.A. Wilcoxon (1970)
       Genus †Cyclococcolithus Kamptner (1954)
       Genus †Dictyococcites M. Black (1967)
       Genus †Discoaster Tan, 1927
       Genus †Discorhabdus Noel (1965)
       Genus Discosphaera Haeckel (1894)
       Genus †Eiffelithus see Genus Eiffellithus P. Reinhardt (1965)
       Genus Emiliania W.W. Hay & H. Mohler (1967)
       Genus †Ethmorhabdus Noel (1965)
       Genus †Fasciculithus Bramlette & F. Sullivan, 1961
       Genus Florisphaera Okada & Honjo (1973)
       Genus †Gartnerago Bukry (1969)
       Genus Gephyrocapsa Kamptner (1943)
       Genus †Hayesites H. Manivit (1971)
       Genus Helicosphaera Kamptner (1954)
       Genus †Heliolithus Bramlette & F. Sullivan, 1961
       Genus †Isthmolithus G. Deflandre (1954)
       Genus †Kamptnerius Deflandre (1959)
       Genus †Lithraphidites Deflandre, 1963
       Genus †Marthasterites Deflandre (1959)
       Genus †Microrhabdulus Deflandre, 1959
       Genus †Micula Vekshina, 1959
       Genus †Nannoconus Kamptner (1931)
       Genus †Parhabdolithus Deflandre, in Grassé (1952)
       Genus †Podorhabdus Noel (1965)
       Genus †Polycostella Thierstein, 1971
       Genus †Reticulofenestra W. Hay et al. (1966)
       Genus Rhabdosphaera Haeckel (1894)
       Genus †Rucinolithus L. Stover, 1966
       Genus Scyphosphaera Lohmann (1902)
       Genus †Sphenolithus G. Deflandre, in P.-P. Grassé, 1952
       Genus †Stephanolithion Deflandre (1939)
       Genus Syracosphaera Lohmann (1902)
       Genus †Tetralithus M. Gardet (1955)
       Genus †Tribrachiatus Shamrai, 1963
       Genus †Triquetrorhabdulus Martini, 1965
       Genus †Tubodiscus H.R. Thierstein (1973)
       Genus †Watznaueria P. Reinhardt (1964)