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 Polyopisthocotylea Odhner, 1912 see Subclass Polyopisthocotylea Superfamily Diclidophoroidea Fuhrmann, 1928 Family Mazocraëidae Price, 1936 see Family Mazocraeidae Price, 1936