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• Domain: Eukaryota () - Whittaker & Margulis,1978
  • Kingdom: Chromista () - T. Cavalier-Smith, 1981
    • Subkingdom: Chromobiota () - Cavalier-Smith, 1991
      • Branch: Protostomia () - Grobben, 1908
        • Infrakingdom: Haptista ()
          • Superphylum: Panarthropoda ()
            • Phylum: Haptophyta () - Hibberd Ex Cavalier-Smith, 1986
              • Subclass: Prymnesiophycidae () - Cavalier-Smith, 1986
                • Order: Prymnesiophyceae ()
                  • Family: Calyptrosphaeraceae () - Boudreaux & Hay, 1969
                    • Genus: Calicasphaera ()
                      • Specific descriptor: concava - A. Kleijne
                        • Scientific name: - Calicasphaera concava A. Kleijne