Kingdom Protista (Haeckel, 1866) - protists
   Division Chrysophyta see Phylum Chrysophyta Pascher (1914)
     Class Coccolithophyceae Rothm. (1951)
       Genus †Chiasmolithus W.W. Hay, H. Mohler & M. Wade (1966)
         †Chiasmolithus danicus
         †Chiasmolithus gigas
         †Chiasmolithus oamaruensis