Domain Eucaryota
   Subdomain Amoebota Doweld (2001)
     Kingdom Amoebobiota Doweld, 2001
       Subkingdom Oxymonadobiotina Doweld, 2001
         1 Phylum Retortamonadozoa Kussakin & Drozdov, 1998
         2 Phylum Oxymonadozoa Karpov, 1990
         3 Phylum Trichomonadozoa Kussakin & Drozdov, 1998