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• Domain: Eukaryota () - Whittaker & Margulis,1978
  • Kingdom: Protozoa () - (Goldfuss, 1818) R. Owen, 1858 - Protozoa
    • Subkingdom: Biciliata ()
      • Infrakingdom: Alveolata () - Cavalier-Smith, 1991
        • Phylum: Ciliophora () - (Doflein, 1901) Copeland, 1956 - Ciliates
          • Subphylum: Intramacronucleata () - Lynn, 1996
            • Class: Oligohymenophorea () - De Puytorac Et Al., 1974
              • Subclass: Peritrichia () - Stein, 1859
                • Order: Sessilida () - Kahl, 1933
                  • Family: Vorticellidae () - Ehrenberg, 1838
                    • Genus: Zoothamnium ()
                      • Specific descriptor: pygmaeum
                        • Scientific name: - Zoothamnium pygmaeum