Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
     Class Trematoda Rudolphi, 1808 - flukes see Infraclass Trematoda Rudolphi, 1808
       Order Monogenea see Infraclass Monogenea
         Suborder Monopisthocotylea Odhner, 1912 see Subclass Monopisthocotylea
           Superfamily Capsaloidea Baird, 1853
             1 Family Monocotylidae Taschenberg, 1879
             2 Family Capsalidae Baird, 1853
             3 Family Acanthocotylidae Price, 1936
             4 Family Microbothriidae Price, 1936
             5 Family Udonellidae Taschenberg, 1879