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
               Subclass Vorticellatinea Doweld, 2001
                 Order Trichodinopsida Doweld, 2001
                   1 Family Trichodinopsidae Kent, 1881