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 Hemiurata Skrjabin & Guschanskaja, 1954
                   Superfamily Hemiuroidea Faust, 1929
                     Family Halipegidae Poche, 1926
                       1 Genus Halipegus Looss, 1899
                       2 Genus Dollfusiella nom. nud.
                       3 Genus Deropegus J.E. McCauley & I. Pratt, 1961