Domain Eucaryota
   Subdomain Amoebota Doweld (2001)
     Kingdom Hydrobiota Doweld, 2001
       Subkingdom Hydrobiotina Doweld, 2001 [monotypic]
         Phylum Hydrozoa Owen, 1843
           Class Stenoscyphatea Doweld, 2001 [monotypic]
             Order Stenoscyphida Doweld, 2001 [monotypic]
               Family Stenoscyphidae Kishinouye, 1902
                 1 Genus Stenoscyphus Kishinouye, 1902