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 Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
           Class Trematoda Rudolphi, 1808 - flukes see Infraclass Trematoda Rudolphi, 1808
             Subclass Monogenea Carus, 1863 see Infraclass Monogenea
               Suborder Monopisthocotylea Odhner, 1912 see Subclass Monopisthocotylea
                 1 Superfamily Gyrodactyloidea Cobbold, 1864
                 2 Superfamily Dactylogyroidea Bychowsky, 1933
                 3 Superfamily Tetraonchoidea
                 4 Superfamily Udonelloidea Taschenberg, 1879
                 5 Superfamily Capsaloidea Baird, 1853
                 6 Superfamily Acanthocotyloidea Price, 1936