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)
         †Annulithus arkelli