Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Bacillariobiota Doweld (2001)
       Subkingdom Acanthocystobiotina Doweld, 2001
         Phylum Acanthometrozoa Doweld, 2001 [monotypic]
           Class Acanthometratea Doweld, 2001
             Order Amphilithiida Doweld, 2001
               Family Amphilithiidae Haeckel, 1887
                 Genus Amphilithium Haeckel, 1881