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
- Class Annelida (awaiting allocation)
- Class Clitellata
- Subclass Hirudinea
- Subclass Oligochaeta
- Order Capilloventrida
- Order Crassiclitellata
- Order Haplotaxida
- Family Acanthodrilidae Claus, 1990
- Family Ailoscolecidae
- Family Alluroididae Michaelsen 1900
- Family Almidae
- Family Biwadrilidae
- Family Criodrilidae
- Family Dorydrilidae
- Family Enchytraeidae Vejdovsky, 1879
- Family Eudrilidae Claus, 1880
- Family Exxiidae
- Family Glossoscolecidae
- Family Haplotaxidae
- Family Hormogastridae Michaelsen, 1900
- Family Kynotidae
- Family Lumbricidae Claus, 1876
- Family Lutodrilidae
- Family Megascolecidae Rosa, 1891
- Family Microchaetidae
- Family Naididae Ehrenberg, 1828
- Genus Abyssidrilus Erséus, 1992
- Genus Adelodriloides Cook, 1970 accepted as Adelodrilus Cook, 1969
- Genus Adelodrilus Cook, 1969
- Genus Ainudrilus Wang & Erséus, 2003
- Genus Ainudrilus Finogenova, 1982
- Genus Aktedrilus Knöllner, 1935
- Genus Albanidrilus Erséus, 1992
- Genus Alexandrovia Hrabe, 1962
- Genus Allonais Sperber, 1950
- Genus Amphichaeta Tauber, 1879
- Genus Antipodrilus Brinkhurst & Jamieson, 1971
- Genus Arcteonais Piguet, 1928
- Genus Arctodrilus Brinkhurst & Kathman, 1983
- Genus Atlantidrilus Erséus, 1982
- Genus Aulodrilus Bretscher, 1899
- Genus Aulophorus Schmarda, 1861
- Genus Bacescuella Hrabe, 1973 accepted as Aktedrilus Knöllner, 1935
- Genus Baikalodrilus Holmquist, 1978
- Genus Baltidrilus Timm, 2013
- Genus Bathydrilus Cook, 1980
- Genus Bermudrilus Erséus, 1979
- Genus Biprostatus Pinder & Brinkhurst, 2000
- Genus Blanonais Gervais, 1838 accepted as Ophidonais Gervais, 1838
- Genus Blanonaïs Gervais, 1838 accepted as Ophidonais Gervais, 1838
- Genus Bohadschia Hrabe, 1971 accepted as Limnodriloides Pierantoni, 1904
- Genus Bohemilla Vejdovský, 1884 accepted as Vejdovskyella Michaelsen, 1903
- Genus Bohemillula Strand, 1928 accepted as Vejdovskyella Michaelsen, 1903
- Genus Bothrioneuron Stolč, 1886 accepted as Bothrioneurum Stolc, 1888
- Genus Bothrioneurum Stolc, 1888
- Genus Bothrioneurum Michaelsen, 1900 accepted as Bothrioneurum Stolc, 1888
- Genus Branchiodrilus Michaelsen, 1900
- Genus Branchiura Beddard, 1892
- Genus Bratislava Kosel, 1976 accepted as Bratislavia Kosel, 1976
- Genus Bratislavia Kosel, 1976
- Genus Breviatria Pinder & Brinkhurst, 2000
- Genus Burchanidrilus Martin & Brinkhurst, 1998
- Genus Camptodrilus Eisen, 1879
- Genus Chaetobranchus Bourne, 1890 accepted as Branchiodrilus Michaelsen, 1900
- Genus Chaetogaster Baer, 1827
- Genus Chatogaster Parfitt, 1873 accepted as Chaetogaster Baer, 1827
- Genus Chetogaster Gervais, 1838 accepted as Chaetogaster Baer, 1827
- Genus Choetogaster de Blainville, 1828 accepted as Chaetogaster Baer, 1827
- Genus Christerius Holmquist, 1985
- Genus Clitellio Savigny, 1820
- Genus Clitelloides Finogenova, 1985
- Genus Coccavus Shcherbakov, 2007 †
- Genus Coralliodriloides Erséus, 1985
- Genus Coralliodrilus Erséus, 1979
- Genus Curacaodrilus Righi & Kanner, 1979 accepted as Thalassodrilides Brinkhurst & Baker, 1979
- Genus Dera Bory, 1827 accepted as Dero Oken, 1807
- Genus Dero Oken, 1807
- Genus Discordiprostatus Baker, 1982 accepted as Nootkadrilus Baker, 1982
- Genus Doliodrilus Erséus, 1984
- Genus Duridrilus Erséus, 1983
- Genus Duridrulus Erséus, 1983
- Genus Edmondsonia Brinkhurst, 1965
- Genus Edukemius Holmquist, 1978
- Genus Embolocephalus Randolph, 1892
- Genus Epirodrilus Hrabe, 1931
- Genus Euilyodrilus Brinkhurst, 1963 accepted as Potamothrix Vejdovský & Mrázek, 1903
- Genus Gianius Erséus, 1992
- Genus Giereidrilus Erséus, 1981 accepted as Heterodrilus Pierantoni, 1902
- Genus Haber Holmquist, 1978
- Genus Haemonais Bretscher, 1900
- Genus Hemitubifex Eisen, 1879
- Genus Heronidrilus Erséus & Jamieson, 1981
- Genus Heterochaeta Claparède, 1863 accepted as Baltidrilus Timm, 2013
- Genus Heterodriloides Erséus, 1981 accepted as Heterodrilus Pierantoni, 1902
- Genus Heterodrilus Pierantoni, 1902
- Genus Homochaeta Bretscher, 1896
- Genus Hrabeus Semernoy, 2001
- Genus Illyodrilus
- Genus Ilyodrilus Eisen, 1879
- Genus Inanidrilus Erséus, 1979
- Genus Inermidrilus Erséus, 1992
- Genus Isochaeta Pointner, 1911 accepted as Isochaetides Hrabĕ, 1966
- Genus Isochaetides Hrabĕ, 1966
- Genus Jamiesoniella Erséus, 1981
- Genus Janiesoniella Erseus, 1981 accepted as Jamiesoniella Erséus, 1981
- Genus Jolydrilus Marcus in Titschack et al., 1965
- Genus Kaketio Righi & Kanner, 1979 accepted as Thalassodrilides Brinkhurst & Baker, 1979
- Genus Krenedrilus Dumnicka, 1983
- Genus Lahoria Stephenson, 1910
- Genus Lamadrilus Timm, 1998
- Genus Limnodriloideds Pierantoni, 1904 accepted as Limnodriloides Pierantoni, 1904
- Genus Limnodriloides Pierantoni, 1904
- Genus Limnodrilus Claparède, 1862
- Genus Littodrilus Chen, 1940 accepted as Monopylephorus Levinsen, 1884
- Genus Lophochaeta Štolc, 1886
- Genus Lycodrilus Grube, 1873
- Genus Macquaridriloides Erséus & Jamieson, 1981 accepted as Heronidrilus Erséus & Jamieson, 1981
- Genus Macquaridriloidess
- Genus Macquaridrilus Jamieson, 1968
- Genus Macrochaeta Bretscher, 1896 accepted as Vejdovskyella Michaelsen, 1903
- Genus Macrochaetina Bretscher, 1899 accepted as Vejdovskyella Michaelsen, 1903
- Genus Macroseta Erséus, 1975 accepted as Bathydrilus Cook, 1980
- Genus Marcusaedrilus Righi & Kanner, 1979 accepted as Smithsonidrilus Brinkhurst, 1966
- Genus Marionidrilus Erséus, 1992
- Genus Mesenchytroeus
- Genus Mexidrilus Erséus, 1992
- Genus Milliganius Erséus, 1992
- Genus Mitinokuidrilus Takashima & Mawatari, 1998
- Genus Monopylephorus Levinsen, 1884
- Genus Nadium accepted as Pristina Ehrenberg, 1828
- Genus Naibia Shcherbakov, 2007 †
- Genus Naidispora Liu, Stentiford, Ren, Yuan, Song, Yu, Li, Xiang & Zhang, 2022
- Genus Naidium Schmidt, 1847 accepted as Pristina Ehrenberg, 1828
- Genus Nais Müller, 1774
- Genus Naïs Müller, 1771 accepted as Nais Müller, 1774
- Genus Naisea Rafinesque, 1815 accepted as Nais Müller, 1774
- Genus Neonais Sokolskaya, 1962
- Genus Nootkadrilus Baker, 1982
- Genus Olavius Erséus, 1984
- Genus Opheonais Gistl, 1857 accepted as Ophidonais Gervais, 1838
- Genus Ophidonais Gervais, 1838
- Genus Pacifidrilus Erséus, 1992
- Genus Panirena Shcherbakov, 2007 †
- Genus Parakaketio Erséus, 1982
- Genus Paraktedrilus Erséus, 1992
- Genus Paranadrilus Gavrilov, 1955
- Genus Paranais Czerniavsky, 1880
- Genus Pararhyacodrilus Snimshchikova, 1985
- Genus Pararhyacodrilus Snimstschikova, 1986
- Genus Paupidrilus Erséus, 1990
- Genus Pectinodrilus Erséus, 1992
- Genus Pedonais Collado & Schmelz, 2000
- Genus Peipsidrilus Timm, 1977 †
- Genus Peloryctes Leuckart, 1849 accepted as Clitellio Savigny, 1820
- Genus Peloscolex Leidy, 1851
- Genus Peosidrilus Baker & Erséus, 1979
- Genus Peristodrilus Baker & Brinkhurst, 1981
- Genus Phallobaikalus Martínez-Ansemil in Martin, Martínez-Ansemil & Sambugar, 2010
- Genus Phallodriloides Erséus, 1992
- Genus Phallodrilus Pierantoni, 1902
- Genus Piguetiella Sperber, 1940
- Genus Piquetiella accepted as Piguetiella Sperber, 1940
- Genus Pirodriloides Erséus, 1992
- Genus Pirodrilus Erséus, 1992
- Genus Pomatothrix accepted as Potamothrix Vejdovský & Mrázek, 1903
- Genus Postiodrilus Boldt, 1926 accepted as Monopylephorus Levinsen, 1884
- Genus Potamothrix Vejdovský & Mrázek, 1903
- Genus Pristina Ehrenberg, 1828
- Genus Pristinella Brinkhurst, 1985
- Genus Protuberodrilus Giani & Martinez-Ansemil, 1980
- Genus Psammoryctes Vejdovský, 1876 accepted as Psammoryctides Hrabe, 1964
- Genus Psammoryctides Hrabe, 1964
- Genus Pseudochaetogaster Lafont, 1981
- Genus Pseudospiridion Erséus, 1992
- Genus Quistadrilus Brinkhurst, 1981
- Genus Quistradrilus accepted as Quistadrilus Brinkhurst, 1981
- Species Quistradrilus multisetosus Brinkhurst & Cook, 1966
- Genus Rhacodrilus
- Genus Rhizodrilus Smith, 1900
- Genus Rhyacodrilis accepted as Rhyacodrilus Bretscher, 1901
- Genus Rhyacodriloides Chekanovskaya, 1975
- Genus Rhyacodrilus Bretscher, 1901
- Genus Ripistes Dujardin, 1842
- Genus Rossidrilus Erséus & Rota, 1996
- Genus Schmardaella Michaelsen, 1900
- Genus Semernodrilus Timm, 2020
- Genus Siolidrilus Marcus, 1949
- Genus Sketodrilus Karaman, 1976 †
- Genus Slavina Vejdovský, 1884
- Genus Smithsonidrilus Brinkhurst, 1966
- Genus Somalidrilus Erséus, 1992
- Genus Specaria Sperber, 1940
- Genus Spiridion Knöllner, 1935
- Genus Spiroderma Spengal, 1880 accepted as Spirosperma Eisen, 1879
- Genus Spirosperma Eisen, 1879
- Genus Stephensoniana Černosvitov, 1938
- Genus Stochidrilus Martinez-Ansemil, Sambugar & Giani, 1997
- Genus Stylaria Lamarck, 1816
- Genus Svetlovia Chekanovskaya, 1975
- Genus Tasserkidrilus Holmquist, 1985
- Genus Taupodrilus Benham, 1904
- Genus Tectidrilus Erséus, 1982
- Genus Telliclio Timm in Timm & Popchenko, 1978
- Genus Telmatodrilus Eisen, 1879
- Genus Teneridrilus Holmquist, 1985
- Genus Teneridrilus Eisen, 1879
- Genus Thalassodrilides Brinkhurst & Baker, 1979
- Genus Thalassodrilus Brinkhurst, 1963
- Genus Torodrilus Cook, 1970
- Genus Trasserkidrilus accepted as Tasserkidrilus Holmquist, 1985
- Genus Troglodrilus Juget, des Châtelliers & Rodriguez, 2006
- Genus Tubifex Lamarck, 1816
- Genus Tubificidarum Karaman, 1973
- Genus Tubificoides Lastočkin, 1937
- Genus Uncinais Levinsen, 1884
- Genus Uniporodrilus Erséus, 1979
- Genus Uronais Gervais, 1837
- Genus Vadicola Baker, 1982 accepted as Ainudrilus Finogenova, 1982
- Genus Varichaeta Brinkhurst, 1981 accepted as Varichaetadrilus Brinkhurst & Kathman, 1983
- Genus Varichaetadrilus Brinkhurst & Kathman, 1983
- Genus Vejdovskiella Michaelsen, 1903 accepted as Vejdovskyella Michaelsen, 1903
- Genus Vejdovskyella Michaelsen, 1903
- Genus Vermiculus Goodrich, 1892 accepted as Monopylephorus Levinsen, 1884
- Genus Wapsa Marcus in Titschack et al., 1965
- Genus Waspa Marcus, 1965 accepted as Paranais Czerniavsky, 1880
- Family Narapidae
- Family Ocnerodrilidae Beddard, 1892
- Family Octochaetidae
- Family Opisthocystidae accepted as Opistocystidae Cernosvitov, 1936
- Family Opistocystidae Cernosvitov, 1936
- Family Phreodrilidae Beddard, 1891
- Family Propappidae
- Family Randiellidae Erséus & Strehlow, 1986
- Family Sparganophilidae
- Family Syngenodrilidae accepted as Alluroididae Michaelsen 1900
- Family Tubificidae Vejdovský, 1884 accepted as Naididae Ehrenberg, 1828
- Order Lumbriculida
- Order Moniligastrida
- Order Oligochaeta (awaiting allocation)
- Order Oligochaeta incertae sedis
- Order Tubificida
- Order Branchiobdellida
- Class Machaeridia
- Class Myzostomaria
- Class Polychaeta
- Family Lobatocerebridae Rieger, 1980
- Genus Aulozoon Gehling & Runnegar, 2022 †
- Genus Gabavermis Troppenz, 2013 †
- Genus Lapillitubus Belaústegui & Belaústegui, 2017 †
- Genus Meanderovaleichnus Cónsole-Gonella & Aceñolaza, 2014 †
- Genus Shaihuludia Kimmig, LaVine, Schiffbauer, Egenhoff, Shelton & Leibach, 2023 †
- Genus Spitiprion Tonarová, Suttner, & Hints, 2024 †
- Genus Taonurus Saporta & Marion, 1881 †
- Genus Xiaoshibachaeta Yang, Aguado, Yang & Bleidorn, 2024 †
- 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
- 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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