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 Digenea Carus, 1863
         "Cercaria" Müller, 1773, incertae sedis
           Distome cercariae
             1 'Cystocercous' cercariae
             2 'Rhopalocercous' cercariae
             3 'Leptocercous' cercariae
             4 'Trichocercous' cercariae
             5 'Furcocercous' cercariae
             6 'Microcercous' cercariae
             7 'Cercariaea'
             8 'Rat-King' cercariae