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 Polyhymenophora Jankowski, 1967 see Class Spirotrichea Bütschli, 1889
             Subclass Spirotricha see Class Spirotrichea Bütschli, 1889
               Order Hypotrichida Stein, 1859 - hypotrichs see Subclass Hypotrichia (Stein, 1859) Cavalier-Smith, 1993
                 Suborder Sporadotrichina Fauré-Fremiet, 1961 see Order Sporadotrichida Fauré-Fremiet, 1961
                   Family Oxytrichidae Ehrenberg, 1838
                     1 Genus Ancystropodium Fauré-Fremiet, 1908
                     2 Genus Gastrostyla Engelmann, 1862
                     3 Genus Histriculus Corliss, 1960
                     4 Genus Onychodromus Stein, 1859
                     5 Genus Oxytrichaᵀ Bory, 1824
                     6 Genus Pleurotricha Stein, 1859
                     7 Genus Steinia Diesing, 1866
                     8 Genus Stylonychia Ehrenberg, 1830
                     9 Genus Urosoma Kowalewski, 1882