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 Polyopisthocotylea Odhner, 1912 see Subclass Polyopisthocotylea
                 Superfamily Polystomatoidea Gamble, 1896
                   1 Family Polystomatidae Gamble, 1896
                   2 Family Hexabothriidae Price, 1942
                   3 Family Diclybothriidae Bychowsky & Gusev, 1950
                   4 Family Sphyranuridae