Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               "protists" incertae sedis
                 Group †Acritarcha Evitt, 1963, incertae sedis [polyphyletic] - acritarchs
                   Genus †Eisenackidium Cramer & Díez, 1968 ex Eisenack, Cramer & Díez, 1973
                     †Eisenackidium gordonense (Crame, 1964b) Mullins (2004)