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
           Monostome cercariae
             1 Cercaria ephemera Nitzsch, 1807
             2 Cercaria monostomi Linstow, 1896
             3 Cercaria imbricata Looss, 1893
             4 Cercaria lophocerca Filippi, 1857