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 Kinetofragminophora see Class Kinetofragminophorea
             Subclass Gymnostomata see Subclass Gymnostomatia
               Order Prostomatida Schewiakoff, 1896
                 Suborder Prostomatina see Order Prostomatida Schewiakoff, 1896
                   Family Metacystidae Kahl, 1926
                     1 Genus Metacystis Cohn, 1866
                     2 Genus Pelatractus Kahl, 1930
                     3 Genus Vasicola Tatem, 1869