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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 ()
          • Subphylum: Diatomeae () - (Dumortier, 1821) Cavalier-Smith, 1995 - Diatoms
            • Class: Coscinodiscophyceae ()
              • Subclass: Thalassiosirophycidae () - F.e. Round & R.m. Crawford in F.e. Round, R.m. Crawford & D.g.
                • Order: Thalassiosirales ()
                  • Family: Thallassiosiraceae ()
                    • Genus: Thalassiosira ()
                      • Specific descriptor: cormandeliana
                        • Scientific name: - Thalassiosira cormandeliana