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 Oligohymenophora see Class Oligohymenophorea de Puytorac et al., 1974
             Subclass Hymenostomata see Subclass Hymenostomatia (Delage & Hérouard, 1896) Cavalier-Smith, 1993
               Order Hymenostomatidaᵀ Delage & Hérouard, 1896 see Subclass Hymenostomatia (Delage & Hérouard, 1896) Cavalier-Smith, 1993
                 Suborder Tetrahymenina Fauré-Fremiet, 1956 see Order Tetrahymenida Fauré-Fremiet, 1956
                   Family Tetrahymenidae Corliss, 1952
                     1 Genus Blepharostoma Schewiakoff, 1891, nom. nud.
                     2 Genus Colpidium Stein, 1860
                     3 Genus Deltopylum Fauré-Fremiet & Mugard, 1947
                     4 Genus Lambornella Keilin, 1921
                     5 Genus Melacophrya
                     6 Genus Stegochilum Schewiakoff, 1893
                     7 Genus Tetrahymena Furgason, 1940