Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Parameciobiotina Starobogatov, 1986 [monotypic]
         Phylum Parameciozoa Kussakin & Drozdov, 1998
           Subphylum Spirostomozoina Doweld, 2001
             Class Trachelocercatea Doweld, 2001
               1 Subclass Trachelocercatinea Jankowski, 1980
               2 Subclass Loxodatinea Jankowski, 1980
               3 Subclass Geleiatinea Doweld, 2001 [monotypic]