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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: Biddulphiales () - F.e. Round & R.m. Crawford, in F.e. Round Et Al., 1990
              • Subclass: Biddulphiophycidae () - F.e. Round & R.m. Crawford, in F.e. Round Et Al., 1990
                • Order: Coscinodiscophyceae () - Krieger, 1954
                  • Family: Biddulphiaceae () - Kützing, 1844
                    • Genus: Isthmia ()
                      • Specific descriptor: obliquata - (J.E. Smith) C. Agardh
                        • Scientific name: - Isthmia obliquata (J.E. Smith) C. Agardh