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 Stichotrichina Fauré-Fremiet, 1961 see Order Stichotrichida Fauré-Fremiet, 1961
                   Family Holostichidae Fauré-Fremiet, 1961 see Family Urostylidae Bütschli, 1889
                     01 Genus Amphisiella Gourret & Roeser, 1888
                     02 Genus Balladyna Kowalewsky, 1882
                     03 Genus Gonostomum Sterki, 1878
                     04 Genus Holosticha Wrzesniowski, 1877
                     05 Genus Keronopsis Penard, 1922
                     06 Genus Paruroleptus Kahl, 1932 see Genus Uroleptus Ehrenberg, 1831[1832]
                     07 Genus Psammomitra Borror, 1972
                     08 Genus Pseudourostyla Borror, 1972
                     09 Genus Trachelostyla Kahl, 1932
                     10 Genus Trichotaxis Stokes, 1891
                     11 Genus Uroleptopsis Dragesco, 1970
                     12 Genus Uroleptus Ehrenberg, 1831[1832]