#hydrozoan__hydroid  colonial coelenterates having the polyp phase dominant
  supertype:  coelenterate__cnidarian  radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms
  member of:  class_Hydrozoa
  subtype:  hydra  small tubular solitary freshwater hydrozoan polyp
  subtype:  siphonophore  a floating or swimming oceanic colony of polyps often transparent or showily colored
     subtype:  nanomia  small creatures resembling pieces of fuzzy rope; each with a cluster of swimming bells serving as the head and long elastic tentacles for drawing in prey
     subtype:  Portuguese_man-of-war__man-of-war__jellyfish  large siphonophore having a bladderlike float and stinging tentacles
     subtype:  praya  colonial siphonophore of up to 130 ft long
     subtype:  apolemia  large siphonophore of up to 50 ft long
  subtype:  sertularian  feathery colony of long-branched stems bearing stalkless paired polyps

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