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Eukaryota
  Chromista
    Heterokontophyta
      Ochrophyta
            Bacillariophyceae
                    Naviculales
                            Naviculaceae
                                     Navicula
                                             Navicula bottnica
                                                   [Schizonema smithii]
                                             Navicula ramosissima
                                                   [Schizonema ramosissimum]