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
         Suborder Prosostomata Odhner
           01 Family Fellodistomatidae Woolcock, 1912
           02 Family Allocreadiidae Stossich, 1904
           03 Family Acanthocolpidae Lühe, 1902
           04 Family Acanthostomatidae Poche, 1926
           05 Family Zoogonidae Odhner, 1911
           06 Family Ptychogonimidae Dollfus, 1936
           07 Family Azygiidae Odhner, 1911
           08 Family Hemiuridae Lühe, 1901
           09 Family Halipegidae Poche, 1926
           10 Family Accacoeliidae Dollfus, 1923
           11 Family Haplosplanchnidae Poche, 1926
           12 Family Monorchiidae Odhner, 1911
           13 Family Haploporidae Nicoll, 1914
           14 Family Didymozoidae Poche, 1907
           15 Family Aporocotylidae Odhner, 1912
           16 Family Bunoderidae Nicoll, 1914
           17 Family Gorgoderidae Looss, 1901
           18 Family Plagiorchiidae Lühe, 1901
           19 Family Lecithodendriidae Odhner, 1911
           20 Family Cephalogonimidae Looss, 1899
           21 Family Dicrocoeliidae Odhner, 1910
           22 Family Microphallidae Travassos, 1920
           23 Family Opisthorchiidae Lühe, 1901
           24 Family Heterophyidae Odhner, 1914
           25 Family Stomylotrematidae Poche, 1926
           26 Family Philophthalmidae Looss, 1899
           27 Family Orchipedidae Skrjabin, 1924
           28 Family Psilostomatidae Odhner, 1911
           29 Family Eucotylidae Skrjabin, 1924
           30 Family Cathaemasiidae Fuhrmann, 1928
           31 Family Troglotrematidae Odhner, 1914
           32 Family Cyclocoelidae Kossack, 1911
           33 Family Notocotylidae Lühe, 1909
           34 Family Brachylaemidae Joyeux & Foley, 1930 see Family Brachylaimidae Joyeux & Foley, 1930
           35 Family Echinostomatidae Looss, 1902
           36 Family Mesotretidae Poche, 1926
           37 Family Fasciolidae Railliet, 1895
           38 Family Campulidae Odhner, 1926
           39 Family Paramphistomatidae Fischoeder, 1901 see Family Paramphistomidae Fischoeder, 1901
           40 Family Microscaphidiidae Travassos, 1922
           41 Family Mesometridae Poche, 1926
           42 Family Cyathocotylidae Poche, 1926
           43 Family Strigeidae Railliet, 1919
           44 Family Diplostomatidae Poirier, 1886
           45 Family Clinostomatidae Lühe, 1901
           46 Family Schistosomatidae Looss, 1899