Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Parameciobiotina Starobogatov, 1986 [monotypic]
         Phylum Parameciozoa Kussakin & Drozdov, 1998
           Subphylum Parameciozoina Doweld, 2001
             Class Parameciatea Doweld, 2001
               1 Subclass Parameciatinea Doweld, 2001
               2 Subclass Philasteratinea Doweld, 2001
               3 Subclass Tetrahymenatinea Doweld, 2001
               4 Subclass Opalinopsidiatinea Doweld, 2001
               5 Subclass Vorticellatinea Doweld, 2001
               6 Subclass Hoplitophryatinea Doweld, 2001