#class_Hydrozoa__Hydrozoa  coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
  supertype:  #class__clas  (biology) a taxonomic group containing one or more orders
  member:  #hydrozoan  #genus_Hydra  #order_Siphonophora  #genus_Sertularia
  member of:  #phylum_Cnidaria__Cnidaria__Coelenterata__phylum_Coelenterata  hydras; polyps; jellyfishes; sea anemones; corals
     member of:  #subkingdom_Metazoa__Metazoa  multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system
        member of:  #kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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