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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: Diatomeae () - (Dumortier, 1821) Cavalier-Smith, 1995 - Diatoms
            • Class: Bacillariophyceae () - Haeckel, 1878
              • Subclass: Bacillariophycidae () - (Haeckel, 1878) Mann, 1990
                • Order: Bacillariales () - Hendey, 1937
                  • Family: Bacillariaceae () - Ehrenberg, 1831
                    • Genus: Denticula ()
                      • Specific descriptor: obtusa - W.Sm.
                        • Scientific name: - Denticula obtusa W.Sm.