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 Spirostomatea Doweld, 2001 [monotypic]
               Order Spirostomida Doweld, 2001 [monotypic]
                 1 Family Spirostomidae Stein, 1867