#family_Parkeriaceae__Parkeriaceae  coextensive with the genus Ceratopteris; sometimes included in family Polypodiaceae
  supertype:  fern_family  families of ferns and fern allies
  member of:  order_Filicales
  member:  genus_Ceratopteris__Ceratopteris  water ferns
     member:  floating_fern__water_sprite__watersprite__ceratopterispteridioide  aquatic fern of tropical America often used in aquariums
     member:  Ceratopteris_thalictroides__floating_fern  pantropical aquatic fern

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