Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Parameciobiotina Starobogatov, 1986 [monotypic]
         Phylum Parameciozoa Kussakin & Drozdov, 1998
           1 Subphylum Spirostomozoina Doweld, 2001
           2 Subphylum Oxytrichozoina Doweld, 2001
           3 Subphylum Parameciozoina Doweld, 2001