living organisms
   Superkingdom Eukaryotae
     Kingdom Animalia [Linnaeus, 1758]
       Subkingdom Parazoa [(Sollas, 1884)]
         Phylum Porifera [Grant, 1836]
           Class Demospongiae [Sollas, 1885]
             Subclass Tetractinomorpha [Lévi, 1953]
               Order Lithistida [Schmidt, 1870]
                 Suborder Rhabdosina
                   Family Siphonidiidae [Lendenfeld, 1903]
                     Genus Siphonidium [Schmidt, 1879]