living organisms
 see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
  
 Superkingdom Eukaryotae
 see Domain Eukaryota Chatton, 1925
    
 Kingdom Animalia Linnaeus, 1758 - animals
      
 Subkingdom Protozoa Goldfuss, 1818
 see Kingdom Protozoa Goldfuss, 1818
        
 Phylum Ciliophora Doflein, 1901 - ciliates
          
 Class Kinetofragminophora
 see Class Kinetofragminophorea
            
 1 Subclass Gymnostomata
 see Subclass Gymnostomatia
            
 2 Subclass Vestibulifera
 see Subclass Vestibuliferia de Puytorac et al., 1974
            
 3 Subclass Hypostomata Schewiakoff, 1896
 see Subclass Hypostomatia
            
 4 Subclass Suctoria Claparède & Lachmann, 1858 - suctorians