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 Scuticociliatida Small, 1967 see Subclass Scuticociliatia (E.B. Small, 1967)
                 Suborder Thigmotrichina Chatton & Lwoff, 1922 see Order Thigmotrichida Chatton & Lwoff, 1922
                   Family Hysterocinetidae Diesing, 1866
                     1 Genus Hysterocineta Diesing, 1866
                     2 Genus Ptychostomum Stein, 1860