Phylum Platyhelminthes Gegenbaur, 1859 - flatworms Class Trematoda Rudolphi, 1808 - flukes see Infraclass Trematoda Rudolphi, 1808 1 Subclass Monogenea Carus, 1863 see Infraclass Monogenea 2 Subclass Digenea Carus, 1863 3 Subclass Aspidogastrea Faust & Tang, 1936