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
- Class Machaeridia
- Class Myzostomaria
- Class Polychaeta
- Subclass Echiura
- Order Aciculata
- Order Amphinomida
- Order Amphinomorpha
- Order Athecanephria
- Order Canalipalpata
- Order Capitellida
- Order Chaetopterida
- Order Cirratulida
- Order Cossurida
- Order Ctenodrilida
- Order Dinophilida
- Order Errantida †
- Order Eunicemorpha
- Order Eunicida
- Order Flabelligerida
- Order Magelonida
- Order Myzostomida
- Order Nerillida
- Order Opheliida
- Order Orbiniida
- Order Oweniida
- Order Phyllodocemorpha
- Order Phyllodocida
- Family Acoetidae Kinberg, 1856
- Family Alciopidae Ehlers, 1864
- Family Antonbruunidae Fauchald, 1977
- Family Antonbruuniidae Auct. accepted as Antonbruunidae Fauchald, 1977
- Family Aphroditidae Malmgren, 1867
- Family Aphroditoidea (awaiting allocation)
- Family Calamyzidae Hartmann-Schröder, 1971 accepted as Syllidae Grube, 1850
- Family Chrysopetalidae Ehlers, 1864
- Family Eulepethidae Chamberlin, 1919
- Family Fossundecimidae Thompson, 1979 †
- Family Glyceridae Grube, 1850
- Family Goniadidae Kinberg, 1866
- Family Hesionidae Grube, 1850
- Family Ichthyotomidae Eisig, 1906
- Family Iopsilidae accepted as Iospilidae Bergström, 1914
- Family Iospilidae Bergström, 1914
- Family Iphionidae Kinberg, 1856
- Family Isopilidae accepted as Iospilidae Bergström, 1914
- Family Kynephoridae Ehlers, 1920 accepted as Pilargidae de Saint-Joseph, 1899
- Family Lacydoniidae Bergström, 1914
- Family Levidoridae
- Family Lopadorhynchidae accepted as Lopadorrhynchidae Claparède, 1868
- Family Lopadorrhynchidae Claparède, 1868
- Family Microphthalmidae Hartmann-Schröder, 1971
- Family Nautilinidae Miura & Laubier, 1989 accepted as Nautiliniellidae Miura & Laubier, 1990
- Family Nautiliniellidae Miura & Laubier, 1990
- Family Nephthyidae [Polychaeta, misspelling of Nephtyidae] accepted as Nephtyidae Grube, 1850
- Family Nephtyidae Grube, 1850
- Family Nereidae Savigny, 1820 accepted as Nereididae Blainville, 1818
- Family Nereididae Blainville, 1818
- Genus Alitta Kinberg, 1865
- Genus Arete Kinberg, 1865 accepted as Perinereis Kinberg, 1865
- Genus Australonereis Hartman, 1954
- Genus Ceratocephala Malmgren, 1867 accepted as Ceratocephale Malmgren, 1867
- Genus Ceratocephale Malmgren, 1867
- Genus Ceratocephale Ehlers, 1868
- Genus Ceratonereis Kinberg, 1865
- Genus Ceratophale accepted as Ceratocephale Malmgren, 1867
- Genus Chaunorhynchus Chamberlin, 1919 accepted as Ceratocephale Malmgren, 1867
- Genus Cheilonereis Benham, 1916
- Genus Chinonereis Chamberlin, 1924 accepted as Tylorrhynchus Grube, 1866
- Genus Cirrhoceros Quatrefages, 1865
- Genus Cirroceros Claparède, 1863
- Genus Cirroneis Gravier, 1901
- Genus Cirronereis Kinberg, 1865
- Genus Cirronereis Blainville, 1818
- Genus Composetia Hartmann-Schröder, 1985
- Genus Cryptonereis Gibbs, 1971
- Genus Dawbinia Benham, 1950
- Genus Dendronereides Southern, 1921
- Genus Dendronereis Peters, 1854
- Genus Dendronerëis Peters, 1854 accepted as Dendronereis Peters, 1854
- Genus Eunereis Malmgren, 1865
- Genus Ganganereis Misra, 1999
- Genus Gnatholycastis Ehlers, 1920 accepted as Perinereis Kinberg, 1865
- Genus Gymnonereis Horst, 1919
- Genus Gymnorhynchus Horst, 1918 accepted as Gymnonereis Horst, 1919
- Genus Hediste Malmgren, 1867
- Genus Herfriedia Holly, 1935
- Genus Hetenoreis Grube, 1870
- Genus Heteronereis Örsted, 1843
- Genus Imajimainereis de Léon-González & Solís-Weiss, 2000
- Genus Iphinereis Malmgren, 1865
- Genus Kainonereis Chamberlin, 1919
- Genus Kinberginereis Pettibone, 1971
- Genus Laeonereis Hartman, 1945
- Genus Laevispinereis He & Wu, 1989 accepted as Leonnates Kinberg, 1865
- Genus Leonnates Kinberg, 1865
- Genus Leontis Malmgren, 1867
- Genus Lepidonereis Blainville, 1818
- Genus Leptonereis Kinberg, 1865
- Genus Licoris Lamarck, 1838
- Genus Liepphile Bohn, 1906
- Genus Lipephila Malmgren, 1867
- Genus Lipephile Malmgren, 1867
- Genus Lycartis Gravier, 1905
- Genus Lycastella Feuerborn, 1931
- Genus Lycastes Burmeister, 1837
- Genus Lycastilla Solís-Weiss & Espinasa, 1991 accepted as Namanereis Chamberlin, 1919
- Genus Lycastoides Johnson, 1903
- Genus Lycastonereis Nageswara Rao, 1981
- Genus Lycastopsis Augener, 1922 accepted as Namanereis Chamberlin, 1919
- Genus Lycastris Gervais, 1846
- Genus Lycastys Audouin, 1826
- Genus Lycoris Lamarck, 1818 accepted as Nereis Linnaeus, 1758
- Genus Mastigonereis Schmarda, 1861
- Genus Meganereis Blainville, 1818
- Genus Micronereides Day, 1962
- Genus Micronereis Claparède, 1863
- Genus Namalycastes accepted as Namalycastis Hartman, 1959
- Genus Namalycastis Hartman, 1959
- Genus Namanereis Chamberlin, 1919
- Genus Naumachius Kinberg, 1865 accepted as Nereis Linnaeus, 1758
- Genus Neanthes Kinberg, 1865
- Genus Neanthioides Rioja, 1918
- Genus Nectoneanthes Imajima, 1972
- Genus Nectonereis Verrill, 1873 accepted as Platynereis Kinberg, 1865
- Genus Neireis Rochebrune, 1881 accepted as Nereis Linnaeus, 1758
- Genus Neonereis Holly, 1935
- Genus Nephthys Cuvier accepted as Nephtys Cuvier, 1817
- Genus Nereida Blainville, 1818 accepted as Nereis Linnaeus, 1758
- Genus Nereilepa Blainville, 1828
- Genus Nereilepas Örsted, 1843 accepted as Neanthes Kinberg, 1865
- Genus Nereilepas [auctt.] accepted as Nereilepa Blainville, 1828
- Genus Nereis Linnaeus, 1758
- Genus Nevis Moquin-Tandon, 1869 accepted as Nereis Linnaeus, 1758
- Genus Nicomedes Kinberg, 1865
- Genus Nicon Kinberg, 1865
- Genus Nossis Kinberg, 1865
- Genus Notophycus Knox & Cameron, 1970 accepted as Micronereis Claparède, 1863
- Genus Olganereis Hartmann-Schröder, 1977
- Genus Paraleonnates Chlebovitsch & Wu, 1962
- Genus Paraleonnates Amoureux, 1985
- Genus Paralycastis Ehlers, 1920
- Genus Paranereis Kinberg, 1865
- Genus Parasetia Villalobos-Guerrero, Conde-Vela & Sato, 2021
- Genus Perinereis Kinberg, 1865
- Genus Periserrula Paik, 1977 accepted as Paraleonnates Chlebovitsch & Wu, 1962
- Genus Phyllodocella Fauchald & Belman, 1972 accepted as Micronereis Claparède, 1863
- Genus Phyllonereis Hansen, 1882 accepted as Pseudonereis Kinberg, 1865
- Genus Pisenoe Kinberg, 1865 accepted as Platynereis Kinberg, 1865
- Genus Pisionura Hartman & Fauchald, 1971 accepted as Ceratocephale Malmgren, 1867
- Genus Platynereis Kinberg, 1865
- Genus Potamonereis Villalobos-Guerrero, Conde-Vela & Sato, 2021
- Genus Praxithea Malmgren, 1867 accepted as Neanthes Kinberg, 1865
- Species Praxithea irrorata Malmgren, 1867 accepted as Neanthes irrorata (Malmgren, 1867)
- Genus Profundilycastis Hartmann-Schröder, 1977 accepted as Rullierinereis Pettibone, 1971
- Genus Pseudonereis Kinberg, 1865
- Genus Quadricirra Banse, 1977 accepted as Micronereis Claparède, 1863
- Genus Rullierinereis Pettibone, 1971
- Genus Simplisetia Hartmann-Schröder, 1985
- Genus Sinonereis Wu & Sun, 1979
- Genus Solomonereis accepted as Solomononereis Gibbs, 1971
- Genus Solomononereis Gibbs, 1971
- Genus Steninonereis accepted as Stenoninereis Wesenberg-Lund, 1958
- Genus Stenoninereis Wesenberg-Lund, 1958
- Genus Stratonice Malmgren, 1867
- Genus Tambalagamia Pillai, 1961
- Genus Thoosa Kinberg, 1865 accepted as Nereis Linnaeus, 1758
- Genus Tyllorhynchus Chamberlin, 1919 accepted as Tylorrhynchus Grube, 1866
- Genus Tylonereis Fauvel, 1911
- Genus Tylorhynchus McIntosh, 1910 accepted as Tylorrhynchus Grube, 1866
- Genus Tylorhynchus [auctt.] accepted as Tylorrhynchus Grube, 1866
- Genus Tylorrhynchus Grube, 1866
- Genus Typhlonereis Hansen, 1878
- Genus Unanereis Day, 1962
- Genus Uncinereis Chamberlin, 1919 accepted as Platynereis Kinberg, 1865
- Genus Websterinereis Pettibone, 1971
- Genus Webstinereis accepted as Websterinereis Pettibone, 1971
- Genus Wuinereis Khlebovich, 1996
- Family Notophycidae Knox & Cameron, 1970 accepted as Nereididae Blainville, 1818
- Family Palmyridae Kinberg, 1858 accepted as Aphroditidae Malmgren, 1867
- Family Paralacydoniidae Pettibone, 1963
- Family Peisidicidae accepted as Pholoidae Kinberg, 1858
- Family Pholoidae Kinberg, 1858
- Family Pholoididae Fauchald, 1977 accepted as Sigalionidae Malmgren, 1867
- Family Phyllodocida incertae sedis
- Family Phyllodocidae Örsted, 1843
- Family Pilargidae de Saint-Joseph, 1899
- Family Pisionidae Southern, 1914 accepted as Sigalionidae Malmgren, 1867
- Family Polynoidae Malmgren, 1867
- Family Polyodontidae Buchanan, 1894 accepted as Acoetidae Kinberg, 1856
- Family Pontodoridae Bergström, 1914
- Family Sigalionidae Malmgren, 1867
- Family Sphaerodoridae Malmgren, 1867
- Family Syllidae Grube, 1850
- Family Talehsapiidae Misra, 1999 accepted as Pilargidae de Saint-Joseph, 1899
- Family Tomopteridae Johnston, 1865
- Family Typhloscolecidae Uljanin, 1878
- Family Yndolaciidae Støp-Bowitz, 1987
- Order Poeobiida
- Order Polychaeta (awaiting allocation)
- Order Polychaeta incertae sedis
- Order Polygordiida
- Order Protodrilida
- Order Psammodrilida
- Order Pseudocirratulida
- Order Sabellida
- Order Scolecida
- Order Serpulimorpha
- Order Spintherida
- Order Spiomorpha
- Order Spionida
- Order Sternaspida
- Order Terebellida
- Order Terebellomorpha
- Order Thecanephria
- Genus Echinokleptus Muir, Botting, Lefebvre, Upton & Zhang, 2019 †
- Genus Kootenayscolex Nanglu & Caron, 2018 †
- 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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