Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Parameciobiotina Starobogatov, 1986 [monotypic]
         Phylum Parameciozoa Kussakin & Drozdov, 1998
           Subphylum Oxytrichozoina Doweld, 2001
             Class Oxytrichatea Doweld, 2001
               1 Subclass Protocruziatinea de Puytorac, Grain & Mignot, 1987
               2 Subclass Euplotiatinea Tuffrau & Fleury, 1994
               3 Subclass Strobilidiatinea Doweld, 2001 [monotypic]
               4 Subclass Oxytrichatinea Tuffrau & Fleury, 1994
               5 Subclass Halteriatinea Doweld, 2001