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• Domain: Eukaryota () - Whittaker & Margulis,1978
  • Kingdom: Chromista () - T. Cavalier-Smith, 1981
    • Subkingdom: Chromobiota () - Cavalier-Smith, 1991
      • Infrakingdom: Heterokonta () - (Cavalier-Smith, 1986) Cavalier-Smith, 1995
        • Phylum: Ochrophyta () - (Cavalier-Smith, 1986) T. Cavalier-Smith, 1995
          • Subphylum: Phaeista () - Cavalier-Smith, 1995
            • Infraphylum: Chrysista () - (Cavalier-Smith, 1986) Cavalier-Smith, 1995
              • Superclass: Phaeistia () - Cavalier-Smith, 1995
                • Class: Phaeophyceae ()
                  • Order: Dictyotales ()
                    • Family: Dictyotaceae () -  
                      • Genus: Pachydictyon ()
                        • Specific descriptor: polycladum - Alg-20217
                          • Scientific name: - Pachydictyon polycladum (Sonder ex Kützing) Womersley