Domain Eucaryota
   Subdomain Amoebota Doweld (2001)
     Kingdom Amoebobiota Doweld, 2001
       Subkingdom Amoebobiotina Dillon, 1963
         Phylum Gromiozoa Doweld, 2001 [monotypic]
           1 Class Gromiatea Starobogatov, 1980