#family_Zygnemataceae__Zygnemataceae  pond scums: common freshwater algae forming green slimy masses
  supertype:  #protoctist_family  any of the families of Protoctista
  member of:  #order_Zygnematales
  member:  #genus_Zygnema__Zygnema  type genus of the family Zygnemataceae
  member:  #pond_scum  free-floating freshwater green algae
  member:  #genus_Spirogyra  a genus of protoctista
     member:  #spirogyra  freshwater algae consisting of minute filaments containing spiral chlorophyll bands

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