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 Azygiida Schell, 1982
                 Suborder Azygiata
                   Superfamily Azygioidea Lühe, 1909
                     Family Azygiidae Odhner, 1911
                       1 Genus Azygia Looss, 1899
                       2 Genus Otodistomum Stafford, 1904
                       3 Genus Proterometra Horsfall, 1933
                       4 Genus Leuceruthrus Marshall & Gilbert, 1905