Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Class Cestoda
- Class Platyhelminthes (awaiting allocation)
- Class Platyhelminthes incertae sedis
- Class Trematoda
- Order Aspidogastrea (awaiting allocation)
- Order Aspidogastrida
- Order Azygiida
- Order Capsalidea
- Order Chimaericolidea
- Order Dactylogyrida (awaiting allocation)
- Order Dactylogyridea
- Order Diclybothriidea
- Order Digenea (awaiting allocation)
- Order Digenea incertae sedis
- Order Diplostomida
- Order Echinostomida
- Order Fasciolatoidea
- Order Gymnophalloidea (awaiting allocation)
- Order Gyrodactylidea
- Order Hemiuroidea (awaiting allocation)
- Order Lepocreadioidea (awaiting allocation)
- Order Mazocraeidea
- Order Monocotylidea
- Order Monogenea (awaiting allocation)
- Order Monopisthocotylea (awaiting allocation)
- Order Montchadskyellidea
- Order Opisthorchiida
- Order Paramphistomoidea (awaiting allocation)
- Order Plagiorchiida
- Family Aephnidiogenidae Yamaguti, 1934
- Family Allassogonoporidae
- Family Allocreadiidae Looss, 1902
- Family Alloglossidiidae Hernández-Mena, Mendoza-Garfias, Ornelas-García & Pérez-Ponce de León, 2016
- Family Anchitrematidae Mehra, 1935
- Family Anenterotrematidae Yamaguti, 1958
- Family Angiodictydae accepted as Microscaphidiidae Looss, 1900
- Family Angiodictyidae Looss, 1902 accepted as Microscaphidiidae Looss, 1900
- Family Apocreadiidae Skrjabin, 1942
- Family Atractotrematidae Yamaguti, 1939 accepted as Emprostiotrematidae Ceccolini & Cianferoni, 2021
- Family Auridistomatidae
- Family Auridistomidae Lühe, 1901
- Family Balanorchiidae Stunkard, 1925
- Family Bathcotylidae
- Family Batrachotrematidae Dollfus & Williams, 1966
- Family Brachycladiidae Odhner, 1905
- Family Brachycoelidae accepted as Brachycoeliidae Looss, 1899
- Family Brachycoeliidae Looss, 1899
- Family Braunotrematidae Yamaguti, 1958
- Family Caballerotrematidae Tkach, Kudlai & Kostadinova, 2016
- Family Callodistomatidae
- Family Callodistomidae Odhner, 1910
- Family Calycodidae Dollfus, 1929
- Family Cephalogonimidae Looss, 1899
- Family Cephaloporidae
- Family Choanocotylidae Jue Sue & Platt, 1998
- Family Choerocotylidae Yamaguti, 1971
- Family Collyriclidae Ward, 1917
- Family Cortrematidae Yamaguti, 1958
- Family Derogenidae Nicoll, 1910
- Family Deropristidae Cable & Hunninen, 1942
- Family Deropristiidae accepted as Deropristidae Cable & Hunninen, 1942
- Family Dicrocoeliidae Looss, 1899
- Genus Allocorrigia Turner & Corkum, 1977
- Genus Athesmia Looss, 1899
- Genus Brachydistomum Travassos, 1944
- Genus Brachylecithum Strom, 1940
- Genus Brodenia Gedoelst, 1913
- Genus Caballerolecythus Lamothe-Argumedo, Falcón-Ordaz, García-Prieto & Fernández-Fernández, 2005
- Genus Concinnum Bhalerao, 1936
- Genus Conspicuum
- Genus Controrchis Price, 1928
- Genus Corrigia Strom, 1940
- Genus Diacrocoelium Neumann, 1897 accepted as Dicrocoelium Dujardin, 1844
- Genus Dicrocaelium Pontallié, 1853 accepted as Dicrocoelium Dujardin, 1844
- Genus Dicrococlium Sonsino, 1893 accepted as Dicrocoelium Dujardin, 1844
- Genus Dicrocoelioides Dollfus, 1954
- Genus Dicrocoelium Dujardin, 1844
- Genus Dictyonograptus Travassos, 1919
- Genus Dricocoelium Railliet, 1900 accepted as Dicrocoelium Dujardin, 1844
- Genus Ducrocoelium Neumann, 1897 accepted as Dicrocoelium Dujardin, 1844
- Genus Euparadistomum Tubangui, 1931
- Genus Eurytrema Looss, 1907
- Genus Leptophallus Lühe in Brauer, 1909
- Genus Lubens Bhalerao, 1936
- Genus Lutztrema Travassos, 1941
- Species Lutztrema monenteron
- Genus Lyperosomum Looss, 1899
- Genus Lyperostomum Pratt, 1912 accepted as Lyperosomum Looss, 1899
- Genus Otongatrema Achatz, Cleveland, Carrión Bonilla, Cronin & Tkach, 2020 †
- Genus Paradistomum Kossack, 1910
- Genus Platynosomum Looss, 1907
- Genus Platynosum Stiles & Hassall, 1908 accepted as Platynosomum Looss, 1907
- Genus Pojmanskatrema Hildebrand & Tkach, 2019
- Genus Prosolecithus Yamaguti, 1971
- Genus Pseudoparadistomum Roca, 2003
- Genus Robertdigenea Caballero y Caballero & Caballero, 1970 †
- Genus Skrjabinus Bhalerao, 1936
- Genus Stromitrema Skrjabin & Evranova, 1944
- Genus Unilaterilecithum Oshmarin in Skrjabin, 1952
- Genus Yungasicola Gardner & Perez-Ponce De Leon, 2002
- Genus Zonorchis Travassos, 1944
- Family Diplangidae Yamaguti, 1971
- Family Dolichoperidae
- Family Dolichoperoididae Johnston & Angel, 1940
- Family Echinochasmidae Odhner, 1910
- Family Emprostiotrematidae Ceccolini & Cianferoni, 2021
- Family Encyclometridae Mehra, 1931
- Family Enenteridae Yamaguti, 1958
- Family Eucotylidae Cohn, 1904
- Family Eumegacetidae Travassos, 1922
- Family Exotidendriidae Mehra, 1935
- Family Faustulidae Poche, 1926
- Family Fellodistomidae Nicoll, 1909
- Family Gibsonivermidae Bray, Cribb & Cutmore, 2018
- Family Glypthelminthidae Cheng, 1959
- Family Gorgocephalidae Manter, 1966
- Family Gorgoderidae Looss, 1899
- Family Gyrabascidae Macy, 1935
- Family Haematoloechidae Freitas & Lent, 1939
- Family Haploporidae Nicoll, 1914
- Family Himasthlidae Odhner, 1910
- Family Homalometridae
- Family Labicolidae Blair, 1979
- Family Laterotrematidae
- Family Lecithodendriidae Lühe, 1901
- Family Lepidapedidae Yamaguti, 1958
- Family Lepocreadiidae Odhner, 1905
- Family Lepocreadioidea incertae sedis
- Family Leptophallidae Dayal, 1938
- Family Leyogonimidae Dollfus, 1951
- Family Liliatrematidae Gubanov, 1953
- Family Lissorchiidae Magath, 1917
- Family Macroderidae
- Family Macroderoididae McMullen, 1937
- Family Maseniidae
- Family Mesocoeliidae Dollfus, 1929
- Family Microphallidae Ward, 1901
- Family Monorchiidae Odhner, 1911
- Family Nanophyetidae
- Family Nuitrematidae Kurochkin, 1975
- Family Ocadiatrematidae Fischthal & Kuntz, 1981
- Family Ochetosomatidae
- Family Octotestidae
- Family Olveriidae Yamaguti, 1958
- Family Omphalometridae Looss, 1899
- Family Opecoelidae Ozaki, 1925
- Family Opisthogonimidae Travassos, 1928
- Family Opistholebetidae Fukui, 1929
- Family Pachypsolidae Yamaguti, 1958
- Family Paragonimidae Dollfus, 1939
- Family Phaneropsolidae Mehra, 1935
- Family Plagiorchiidae Lühe, 1901
- Family Pleorchiidae
- Family Pleurogenidae Looss, 1899
- Family Prosthogonimidae Lühe, 1909
- Family Prouterinidae Foreyt, Schell & Beyer, 1996
- Family Renicolidae Dollfus, 1939
- Family Reniferidae Pratt, 1902
- Family Renschetrematidae Yamaguti, 1971
- Family Rhytidodidae Odhner, 1926
- Family Sclerodistomoididae Gibson & Bray, 1979
- Family Steganodermatidae accepted as Zoogonidae Odhner, 1902
- Family Stephanopharyngidae Stiles & Goldberger, 1910
- Family Stomylotrematidae Poche, 1926
- Family Styphlotrematidae Baer, 1924
- Family Taiwantrematidae Fischthal & Kuntz, 1981
- Family Tandanicolidae Johnston, 1927
- Family Telorchiidae Looss, 1899
- Family Thrinascotrematidae Jue Sue & Platt, 1999
- Family Troglotrematidae Odhner, 1914
- Family Waretrematidae Srivastava, 1937 accepted as Haploporidae Nicoll, 1914
- Family Zonocotylidae Yamaguti, 1963
- Family Zoogonidae Odhner, 1902
- Family Zygocotylidae Ward, 1917
- Genus Cadenatella Dollfus, 1946
- Genus Jeancadenatia Dollfus, 1946 accepted as Cadenatella Dollfus, 1946
- Genus Zdzitowieckitrema Sokolov, Lebedeva, Gordeev & Khasanov, 2019
- Order Polyopisthocotylea
- Order Polyopisthocotylea (awaiting allocation)
- Order Polystomatidea
- Order Stichocotylida
- Order Strigeidida
- Order Trematoda (awaiting allocation)
- Order Trematoda incertae sedis
- Order Zoogonoidea (awaiting allocation)
- Genus Kunckelia Künstler, 1881
- Genus Künckelia Künstler, 1881 accepted as Kunckelia Künstler, 1881
- Class Turbellaria
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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