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 Echinostomida LaRue, 1957
                 Suborder Paramphistomata
                   Superfamily Paramphistomatoidea Fischoeder, 1901 see Superfamily Paramphistomoidea Fischoeder, 1901
                     Family Gastrothylacidae Stiles & Goldberger, 1910
                       Genus Gastrothylax Poirier, 1883