eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 [paraphyletic] - protozoa
     Subkingdom Sarcomastigota Cavalier-Smith, 1983 [paraphyletic] see [unranked] dorsates Cavalier-Smith, 2021
       Phylum Sulcozoa Cavalier-Smith, 2012 [paraphyletic] see [unranked] dorsates Cavalier-Smith, 2021
         Subphylum Apusozoa Cavalier-Smith, 1997 see Phylum Apusozoa Cavalier-Smith, 1997
           Class Thecomonadea Cavalier-Smith, 1993 [monotypic]
             1 Order Apusomonadida Karpov & Mylnikov, 1989 [monotypic]