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Eukaryota
  Chromista
    Heterokonta
      Ochrophyta
            Pelagophyceae
                    Sarcinochrysidales
                            Chrysocystaceae
            Phaeophyceae
                    Chordales
                            Chordaceae
                    Desmarestiales
                            Arthrocladiaceae
                            Desmarestiaceae
                    Dictyotales
                            Dictyotaceae
                    Ectocarpales
                            Acinetosporaceae
                            Adenocystaceae
                            Chordariaceae
                            Ectocarpaceae
                            Petrospongiaceae
                            Scytosiphonaceae
                    Fucales
                            Bifurcariopsidaceae
                            Durvillaeaceae
                            Fucaceae
                            Himanthaliaceae
                            Hormosiraceae
                            Notheiaceae
                            Sargassaceae
                            Seirococcaceae
                            Xiphophoraceae
                    Ishigeales
                            Ishigeaceae
                            Piliniaceae
                    Laminariales
                            Agaraceae
                            Alariaceae
                            Laminariaceae
                            Lessoniaceae
                    Nemodermatales
                            Nemodermataceae
                            Zeacarpaceae
                    Ralfsiales
                            Mesosporaceae
                            Neoralfsiaceae
                            Pseudoralfsiaceae
                            Ralfsiaceae
                    Scytothamnales
                            Asteronemataceae
                            Bachelotiaceae
                            Splachnidiaceae
                    Sphacelariales
                            Cladostephaceae
                            Sphacelariaceae
                            Stypocaulaceae
                    Sporochnales
                            Sporochnaceae
                    Stschapoviales
                            Halosiphonaceae
                    Syringodermatales
                            Syringodermataceae
                    Tilopteridales
                            Cutleriaceae
                            Phyllariaceae
                            Tilopteridaceae
            Xanthophyceae
                    Vaucheriales
                            Vaucheriaceae