Domain Eucaryota
   Subdomain Amoebota Doweld (2001)
     Kingdom Hydrobiota Doweld, 2001
       Subkingdom Hydrobiotina Doweld, 2001 [monotypic]
         Phylum Hydrozoa Owen, 1843
           Class Stenoscyphatea Doweld, 2001 [monotypic]
             1 Order Stenoscyphida Doweld, 2001 [monotypic]