Acanthocolpidae Lühe, 1906 (basis of record)
Allocreadioidea Looss, 1902 accepted as Gorgoderoidea Looss, 1901 (basis of record)
Anomalotrema Zhukov, 1957 (basis of record)
Anomalotrema koiae Gibson & Bray, 1984 (basis of record)
Azygiidae Lühe, 1909 (basis of record)
Bacciger Nicoll, 1914 (basis of record)
Bacciger bacciger (Rudolphi, 1819) Nicoll, 1914 (basis of record)
Botulus Guiart, 1938 (basis of record)
Botulus microporus (Monticelli, 1889) Gibson & Bray, 1977 (basis of record)
Brachyenteron Manter, 1934 (basis of record)
Brachyenteron campbelli Bray & Gibson, 1986 (basis of record)
Brachyenteron pycnorganum (Rees, 1953) Overstreet & Pritchard, 1977 (basis of record)
Brachyphallus Odhner, 1905 (basis of record)
Brachyphallus crenatus (Rudolphi, 1802) Odhner, 1905 (basis of record)
Cirkennedya Gibson & Bray, 1979 (basis of record)
Cirkennedya porlockensis Gibson & Bray, 1979 (basis of record)
Copiatestes Crowcroft, 1948 (basis of record)
Copiatestes filiferus (Leuckart in Sars, 1885) Gibson & Bray, 1977 (basis of record)
Cryptocotyle Lühe, 1899 (basis of record)
Cryptocotyle concava (Creplin, 1825) Lühe, 1899 (basis of record)
Cryptocotyle lingua (Creplin, 1825) Fischoeder, 1903 (basis of record)
Derogenes Lühe, 1900 (basis of record)
Derogenes varicus (Müller, 1784) Looss, 1901 (basis of record)
Derogenidae Nicoll, 1910 (basis of record)
Derogenoides Nicoll, 1913 (basis of record)
Didymozoidae Monticelli, 1888 (basis of record)
Digenea (basis of record)
Dinosoma Manter, 1934 (basis of record)
Dinosoma ventrovesiculare Gibson & Bray, 1986 (basis of record)
Diphterostomum betencourti (Monticelli, 1893) Odhner, 1911 (basis of record)
Diphterostomum brusinae (Stossich, 1888) Stossich, 1904 (basis of record)
Diphterostomum vividum (Nicoll, 1912) Bray & Gibson, 1986 (basis of record)
Ectenurus Looss, 1907 (basis of record)
Ectenurus lepidus Looss, 1907 (basis of record)
Faustulidae Poche, 1926 (basis of record)
Fellodistomidae Nicoll, 1909 (basis of record)
Fellodistomum Stafford, 1904 (basis of record)
Fellodistomum agnotum Nicoll, 1909 (basis of record)
Fellodistomum fellis (Olsson, 1868) Nicoll, 1909 (basis of record)
Gaevskajatrema Gibson & Bray, 1982 (basis of record)
Gaevskajatrema perezi (Mathias, 1926) Gibson & Bray, 1982 (basis of record)
Glomericirrus Yamaguti, 1937 (basis of record)
Glomericirrus macrouri (Gaevskaja, 1973) Gaevskaja, 1979 (basis of record)
Gymnophalloidea Odhner, 1905 (basis of record)
Halvorsenius Gibson, MacKenzie & Cottle, 1981 (basis of record)
Halvorsenius exilis Gibson, MacKenzie & Cottle, 1981 (basis of record)
Hemipera Nicoll, 1913 (basis of record)
Hemipera ovocaudata Nicoll, 1913 (basis of record)
Hemipera sharpei Jones, 1933 (basis of record)
Hemiuridae Looss, 1899 (basis of record)
Hemiuroidea Looss, 1899 (basis of record)
Hemiurus Rudolphi, 1809 (basis of record)
Hemiurus communis Odhner, 1905 (basis of record)
Hemiurus levinseni Odhner, 1905 (basis of record)
Hirudinella de Blainville, 1828 (basis of record)
Hirudinella ventricosa (Pallas, 1774) Baird, 1853 (basis of record)
Hirudinellidae Dollfus, 1932 (basis of record)
Kenmackenzia Gibson, 1983 (basis of record)
Kenmackenzia gigas (Nardo, 1827) Gibson, 1983 (basis of record)
Lampritrema Yamaguti, 1940 (basis of record)
Lecithochirium Lühe, 1901 (basis of record)
Lecithochirium furcolabiatum (Jones, 1933) Dawes, 1947 (basis of record)
Lecithochirium fusiforme Lühe, 1901 accepted as Lecithochirium grandiporum (Rudolphi, 1819) Lühe, 1901 (basis of record)
Lecithochirium musculus (Looss, 1907) Nasir & Diaz, 1971 (basis of record)
Lecithochirium rufoviride (Rudolphi, 1819) Lühe, 1901 (basis of record)
Lecithocladium Lühe, 1901 (basis of record)
Lecithocladium excisum (Rudolphi, 1819) Lühe, 1901 (basis of record)
Lepidauchen Nicoll, 1913 (basis of record)
Lepidauchen stenostoma Nicoll, 1913 (basis of record)
Lepidophyllum Odhner, 1902 (basis of record)
Lepidophyllum appyi Bray & Gibson, 1986 (basis of record)
Lepidophyllum steenstrupi Odhner, 1902 (basis of record)
Lepocreadioidea Odhner, 1905 (basis of record)
Macroderoididae McMullen, 1937 (basis of record)
Microphalloidea Ward, 1901 (basis of record)
Monascus Looss, 1907 (basis of record)
Monascus filiformis (Rudolphi, 1819) Looss, 1907 (basis of record)
Neophasis Stafford, 1904 (basis of record)
Neophasis anarrhichae (Nicoll, 1909) Bray, 1987 (basis of record)
Neosteganoderma Byrd, 1964 accepted as Proctophantastes Odhner, 1911 (basis of record)
Neosteganoderma glandulosa Byrd, 1964 accepted as Proctophantastes glandulosa (Byrd, 1964) Yamaguti, 1971 (basis of record)
Olssonium Bray & Gibson, 1980 (basis of record)
Olssonium turneri Bray & Gibson, 1980 (basis of record)
Opecoelidae Ozaki, 1925 (basis of record)
Opisthorchiidae Looss, 1899 (basis of record)
Opisthorchioidea Looss, 1899 (basis of record)
Otodistomum Stafford, 1904 (basis of record)
Otodistomum cestoides (Van Beneden, 1870) Odhner, 1911 (basis of record)
Otodistomum plunketi Fyfe, 1953 (basis of record)
Otodistomum veliporum (Creplin, 1837) Stafford, 1904 (basis of record)
Panopula Overstreet & Pritchard, 1977 (basis of record)
Panopula bridgeri Bray & Gibson, 1986 (basis of record)
Plagiorchiida (basis of record)
Plagiorchioidea Lühe, 1901 (basis of record)
Podocotyle Dujardin, 1845 (basis of record)
Podocotyle angulata Dujardin, 1845 (basis of record)
Podocotyle atomon (Rudolphi, 1802) Odhner, 1905 (basis of record)
Podocotyle reflexa (Creplin, 1825) Odhner, 1905 (basis of record)
Podocotyle syngnathi Nicoll, 1913 (basis of record)
Proctoeces Odhner, 1911 (basis of record)