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 Digenea Carus, 1863
               Order Strigeidida
                 Suborder Brachylaimata
                   Superfamily Brachylaimoidea Joyeux & Foley, 1930
                     Family Leucochloridiidae Poche, 1907
                       1 Genus Leucochloridium Carus, 1835
                       2 Genus Dollfusinus Biocca & Ferretti, 1958
                       3 Genus Urorygma Braun, 1901
                       4 Genus Urotocus Looss, 1899