Between brackets is the number of accepted species
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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
- Genus Achaeta Vejdovský, 1878
- Genus Anachaeta Vejdovsky, 1879 accepted as Achaeta Vejdovský, 1878
- Genus Analycus Levinsen, 1884
- Genus Archenchytraeus Michaelsen, 1885 accepted as Archienchytraeus Eisen, 1878
- Genus Archienchytraeus Eisen, 1878
- Genus Aspidodrilus Baylis, 1914
- Genus Barbidrilus Loden & Locy, 1981
- Genus Bryodrilus Ude, 1892
- Genus Bryohenlea Černosvitov, 1934
- Genus Buchholzia Michaelsen, 1886
- Genus Cernosvitoviella Nielsen & Christensen, 1959
- Genus Chirodrillus Verrill, 1871
- Genus Chirodrilus Vejdovský, 1884
- Genus Christensenia Dózsa-Farkas & Convey, 1997 accepted as Christensenidrilus Dózsa-Farkas & Convey, 1998
- Genus Christensenidrilus Dózsa-Farkas & Convey, 1998
- Genus Claparedrilus Klinth, Rota & Erseus, 2017
- Genus Cognettia Nielsen & Christensen, 1959
- Genus Cogniettia Nielsen & Christensen, 1959 accepted as Cognettia Nielsen & Christensen, 1959
- Genus Decimodrilus Dózsa-Farkas, Nagy, Felföldi & Hong, 2019
- Genus Distichopus Leidy, 1882
- Genus Enchylea Nielsen & Christensen, 1963
- Genus Enchytracus Bärensprung, 1843 accepted as Enchytraeus Henle, 1837
- Genus Enchytraeina Bülow, 1957
- Genus Enchytraeoides Roule, 1888 accepted as Lumbricillus Örsted, 1844
- Genus Enchytraeus Henle, 1837
- Genus Enchytreus Udekem, 1854 accepted as Enchytraeus Henle, 1837
- Genus Enchytronia Nielsen & Christensen, 1959
- Genus Epitelphusa Drago, 1887
- Genus Epithelphusa Drago, 1887 accepted as Lumbricillus Örsted, 1844
- Genus Fridericia Michaelsen, 1889
- Genus Globulidrilus Christensen & Dózsa-Farkas, 2012
- Genus Grania Southern, 1913
- Genus Guaranidrilus Černosvitov, 1937
- Genus Hemienchytraeus Černosvitov, 1934
- Genus Hemifridericia Nielsen & Christensen, 1949
- Genus Hemigrania Lasserre, 1971 accepted as Grania Southern, 1913
- Genus Henlea Michaelsen, 1889
- Genus Henleanella Friend, 1913 accepted as Henlea Michaelsen, 1889
- Genus Lumbricillus Örsted, 1844
- Genus Marionia Michaelsen, 1889 accepted as Marionina Michaelsen in Pfeffer, 1890
- Genus Marionina Michaelsen in Pfeffer, 1890
- Genus Mesenchytraeus Eisen, 1878
- Genus Michaelsena Ude, 1896 accepted as Marionina Michaelsen in Pfeffer, 1890
- Genus Neoenchytraeus Eisen, 1878
- Species Neoenchytraeus bulbosa Rosa, 1887 accepted as Fridericia bulbosa (Rosa, 1887)
- Species Neoenchytraeus callosus Eisen, 1878 accepted as Fridericia callosa (Eisen, 1878)
- Species Neoenchytraeus fenestratus Eisen, 1878
- Genus Oconnorella Rota, 1995
- Genus Pachydrilus Claparède, 1861 accepted as Lumbricillus Örsted, 1844
- Genus Palaeoenchytraeus Poinar, 2007 †
- Genus Parenchytraeus Hesse, 1893 accepted as Marionina Michaelsen in Pfeffer, 1890
- Genus Pelmatodrilus
- Genus Randidrilus Coates & Erséus, 1985
- Genus Stephensoniella Černosvitov, 1934
- Genus Stercutus Michaelsen, 1888
- Genus Stevensoniella Cernosvitov, 1934
- Genus Timmodrilus Dózsa-Farkas, 1997
- Genus Xetadrilus Schmelz, Collado & Römbke, 2011
- 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
- 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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