life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukarya Chatton, 1925 see Domain Eukaryota Chatton, 1925
     Kingdom Protoctista Hogg, 1860
       "alveolates" Cavalier-Smith see [unranked] Alveolata Cavalier-Smith, 1991
         Phylum Ciliophora Doflein, 1901 - ciliates
           Subphylum Cyrtophora see Subphylum Intramacronucleata Lynn, 1996
             Class Oligohymenophora see Class Oligohymenophorea de Puytorac et al., 1974
               Subclass Scuticociliatida (E.B. Small, 1967) see Subclass Scuticociliatia (E.B. Small, 1967)
                 Genus Tetrahymena Furgason, 1940