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 Peniculina see Order Peniculida Fauré-Fremiet, 1956
                   Family Frontoniidae Kahl, 1926
                     1 Genus Disematostoma Lauterborn, 1894
                     2 Genus Frontonia Ehrenberg, 1838
                     3 Genus Frontoniella Wetzel, 1927
                     4 Genus Schistophrya Kahl, 1933
                     5 Genus Sigmostomum Gulati, 1925
                     6 Genus Wenrichia Jankowski, 1967