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 Peritricha Stein, 1859 - peritrichs see Subclass Peritrichia Stein, 1859
               Order Peritrichida Stein, 1859 see Subclass Peritrichia Stein, 1859
                 1 Genus Opercularia Goldfuss, 1820
                 2 Suborder Sessilina Kahl, 1933 see Order Sessilida Kahl, 1933
                 3 Suborder Mobilina Kahl, 1933 see Order Mobilida Kahl, 1933