Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Peridiniobiotina Doweld (2001)
         Phylum Gregarinozoa Kussakin & Drozdov, 1998
           Class Eimeriatea Doweld, 2001
             Order Rhytidocystida Doweld, 2001
               Family Rhytidocystidae Levine, 1979
                 1 Genus Rhytidocystis Henneguy, 1907