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
- Family Capsalidae Baird, 1853
- Genus Allobedenenia Yamaguti, 1963
- Genus Allobenedenia Yamaguti, 1963
- Genus Alloencotyllabe Khalil & Abdul-Salam, 1988
- Genus Allomegalocotyla Yamaguti, 1963
- Genus Allometabenedeniella Velasquez, 1982
- Genus Allosprostonia Lawler & Hargis, 1968 accepted as Allobenedenia Yamaguti, 1963
- Genus Ancyrocotile Massa, 1903 accepted as Ancyrocotyle Parona & Monticelli, 1903
- Genus Ancyrocotyle Parona & Monticelli, 1903
- Genus Armatobenedenia Nitta, 2021
- Genus Benedenea Linstow, 1878 accepted as Benedenia Diesing, 1858
- Genus Benedenia Diesing, 1858
- Genus Benedeniella Yamaguti, 1958 accepted as Benedeniella Johnston, 1929
- Genus Benedeniella Johnston, 1929
- Genus Branchobdella Kearn, Whittington & Evans-Gowing, 2007
- Genus Caballerocotyla Price, 1960 accepted as Capsala Bosc, 1811
- Genus Calicobenedenia Kritsky & Fennessy, 1999
- Genus Capsala Bosc, 1811
- Genus Capsaloides Price, 1936
- Genus Capsula Agassiz, 1846 accepted as Capsala Bosc, 1811
- Genus Dioncopseudobenedenia Yamaguti, 1965
- Genus Encotylabe Gamble in Harmer & Shipley, 1896 accepted as Encotyllabe Diesing, 1850
- Genus Encotyllabe Diesing, 1850
- Genus Encotyllahe Monticelli, 1888 accepted as Encotyllabe Diesing, 1850
- Genus Encotyllobe Braun in Bronn, 1889 accepted as Encotyllabe Diesing, 1850
- Genus Entobdella Blainville in Lamarck, 1818
- Genus Entopdella Baer, 1827 accepted as Entobdella Blainville in Lamarck, 1818
- Genus Epibdella Blainville, 1828 accepted as Entobdella Blainville in Lamarck, 1818
- Genus Epiddella Monticelli, 1891 accepted as Epibdella Blainville, 1828
- Genus Epidella Monticelli, 1891 accepted as Epibdella Blainville, 1828
- Genus Epihdella Monticelli, 1888 accepted as Epibdella Blainville, 1828
- Genus Ertopdella Rathke, 1843 accepted as Entobdella Blainville in Lamarck, 1818
- Genus Gracilobenedenia Nitta, 2021
- Genus Interniloculus Suriano & Beverley-Burton, 1979
- Genus Lagenivaginopseudobenedenia Yamaguti, 1966
- Genus Listrocephalos Bullard, Payne & Braswell, 2004
- Genus Macrophylla Hughes, 1928
- Genus Macrophyllida Johnston, 1929
- Genus Mediavagina Lawler & Hargis, 1968
- Genus Megalobenedenia Egorova, 1994
- Genus Megalocotyle Folda, 1928
- Genus Megalocotyloides Bychowsky & Nagibina, 1967 accepted as Allobenedenia Yamaguti, 1963
- Genus Menziesia Gibson, 1976 †
- Genus Metabenedeniella Yamaguti, 1958
- Genus Nasicola Yamaguti, 1968
- Genus Neobenedenia Yamaguti, 1963
- Genus Neobenedeniella Yamaguti, 1963 accepted as Benedenia Diesing, 1858
- Genus Neoencotyllabe Gupta & Krishna, 1975
- Genus Neoentobdella Kearn & Whittington, 2005
- Genus Nitzschia Baer, 1826
- Genus Oligoncobenedenia Yamaguti, 1965
- Genus Parabenedenia Gibson, 1976 † accepted as Menziesia Gibson, 1976 †
- Genus Phyllene Fleming, 1822 accepted as Entobdella Blainville in Lamarck, 1818
- Genus Phylline Oken, 1815
- Genus Phyllonella Van Beneden & Hesse, 1863 accepted as Entobdella Blainville in Lamarck, 1818
- Genus Pseudentobdella
- Genus Pseudoallobenedenia Yamaguti, 1966
- Genus Pseudobenedenia Johnston, 1931
- Genus Pseudobenedeniella Timofeeva, Gaevskaja & Kovaliova, 1987
- Genus Pseudobenedenoides Szidat, 1969 †
- Genus Pseudoentobdella Yamaguti, 1963 †
- Genus Pseudomegalocotyla Yamaguti, 1963
- Genus Pseudonitzschia Yamaguti, 1968
- Genus Sessilorbis Mamaev in Oshmarin, Mamaev & Lebedev, 1970
- Genus Sprostonia Bychowsky, 1957
- Genus Sprostoniella Bychowsky & Nagibina, 1967 †
- Genus Tareenia Hussey, 1986 accepted as Benedenia Diesing, 1858
- Genus Tetrasepta Suriano, 1975
- Species Tetrasepta dischizosepta Suriano, 1975
- Genus Tistomum Taschenberg, 1879 accepted as Tristoma Cuvier, 1817
- Genus Trachopus van Beneden, 1858 accepted as Trochopus Diesing, 1850
- Genus Trechopus Parona & Monticelli, 1902 accepted as Trochopus Diesing, 1850
- Genus Tricotyla accepted as Capsala Bosc, 1811
- Genus Trilobiodiscus Bychowsky & Nagibina, 1967 †
- Genus Trimusculotrema Whittington & Barton, 1990
- Genus Triotoma Goodsir, 1844 accepted as Tristoma Cuvier, 1817
- Genus Tristoma Cuvier, 1817
- Genus Tristomella Guiart, 1938
- Genus Tristomum Nitzsch, 1826 accepted as Tristoma Cuvier, 1817
- Genus Tristonum Setti, 1899 accepted as Tristoma Cuvier, 1817
- Genus Trochopella Euzet & Trilles, 1962
- Genus Trochopus Diesing, 1850
- Family Dionchidae Bychowsky, 1959
- Family Enoplocotylidae Malmberg, 1990
- 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
- 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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