eukaryotes see Domain Eukaryota Chatton, 1925
   Superkingdom Corticata Lankester, 1878 - corticates
     Kingdom Chromista Caval.-Sm. (1981) - chromists
       Subkingdom Hacrobia Okamoto, Chantangsi, Horák, Leander & Keeling, 2009
         Phylum Cryptista Caval.-Sm. (1990), orth. inval. see Phylum Cryptista Cavalier-Smith, 1986
           Subphylum Endohelia Cavalier-Smith, 2015 [monotypic]
             Class Endohelea Cavalier-Smith, 2012
               Order Axomonadida Cavalier-Smith, 2012 [monotypic]
                 Family Tetraheliidae Cavalier-Smith, 2021 [monotypic]
                   Genus Tetrahelia Cavalier-Smith, 2021 [monotypic]
                     1 Tetrahelia pterbica (Mikrjukov & Patterson, 2000)