Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Bacillariobiota Doweld (2001)
       Subkingdom Acanthocystobiotina Doweld, 2001
         1 Phylum Acanthocystozoa Doweld, 2001
         2 Phylum Acanthometrozoa Doweld, 2001 [monotypic]