Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Peridiniobiota Starobogatov ex Doweld (2001)
       Subkingdom Peridiniobiotina Doweld (2001)
         Phylum Gregarinozoa Kussakin & Drozdov, 1998
           Class Gregarinatea Grasse, 1953
             1 Order Exoschizonida Doweld, 2001 [monotypic]
             2 Order Gregarinida Poche, 1913 see Subclass Gregarinasina Dufour, 1828
             3 Order Schizocystida Doweld, 2001