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