Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Bacillariobiota Doweld (2001)
       Subkingdom Acanthocystobiotina Doweld, 2001
         Phylum Acanthocystozoa Doweld, 2001
           1 Class Gymnophryatea Mikrjukov & Mylnikov, 1998
           2 Class Acanthocystatea Doweld, 2001