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 Podophryatea Doweld, 2001
               Subclass Spirochonatinea Doweld, 2001
                 Order Spirochonida Doweld, 2001
                   1 Family Spirochonidae Stein, 1854