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
- Subclass Errantia
- Order Amphinomida
- Order Eunicida
- 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
- 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
- Genus Anoplopisione Laubier, 1967
- Genus Claparedepelogenia Pettibone, 1997
- Genus Conconia Schmarda, 1861 accepted as Sthenelais Kinberg, 1856
- Genus Dayipsammolyce Pettibone, 1997
- Genus Ehlersileanira Pettibone, 1970
- Genus Euleanira Horst, 1916 accepted as Sthenelanella Moore, 1910
- Genus Eupholoe McIntosh, 1885 accepted as Pelogenia Schmarda, 1861
- Genus Eupholoë McIntosh, 1885 accepted as Eupholoe McIntosh, 1885
- Genus Eusigalion Augener, 1918 accepted as Sigalion Audouin & Milne Edwards in Cuvier, 1830
- Genus Eusthenelais McIntosh, 1876
- Genus Euthalanessa Chamberlin, 1919 accepted as Euthalenessa Darboux, 1900
- Genus Euthalenessa Darboux, 1900
- Genus Fauveliella Tebble, 1953 accepted as Pisionidens Aiyar & Alikunhi, 1943
- Genus Fimbriosthenelais Pettibone, 1971
- Genus Hartmanipsammolyce Pettibone, 1997
- Genus Haswellia Darboux, 1899
- Genus Heteropelogenia Pettibone, 1997
- Genus Horstileanira Pettibone, 1970
- Genus Labioleanira Pettibone, 1992
- Genus Labiosthenolepis Pettibone, 1992
- Genus Leanira Kinberg, 1856
- Genus Leanithalessa Hartmann-Schröder in Hartmann-Schröder & Hartmann, 1965
- Genus Lepidopleum Perrier, 1897 accepted as Claparedepelogenia Pettibone, 1997
- Genus Lepidopleum Auctt. accepted as Claparedepelogenia Pettibone, 1997
- Genus Lepidopleurus Claparède, 1868 accepted as Claparedepelogenia Pettibone, 1997
- Genus Mayella Hartmann-Schröder, 1959
- Genus Mustaquimsthenelais Wehe, 2007
- Genus Neoleanira Pettibone, 1970
- Genus Neopsammolyce Pettibone, 1997
- Genus Parapholoe Hartmann-Schröder in Hartmann-Schröder & Hartmann, 1965 accepted as Pholoides Pruvot, 1895
- Genus Parasthenelais Amoureux, 1972 accepted as Eusthenelais McIntosh, 1876
- Genus Pareupholoe Hartmann-Schröder, 1962 accepted as Pholoides Pruvot, 1895
- Genus Peisidice Johnson, 1897 accepted as Pholoides Pruvot, 1895
- Genus Pelagonia auct. [misspelling] accepted as Pelogenia Schmarda, 1861
- Genus Pelogenia Schmarda, 1861
- Genus Phammolyce Grube, 1875 accepted as Psammolyce Kinberg, 1856
- Genus Phloe Schmidt, 1854 accepted as Pholoe Johnston, 1839
- Genus Pholoë Johnston, 1839 accepted as Pholoe Johnston, 1839
- Genus Pholoee Marion & Bobretzky, 1875 accepted as Pholoe Johnston, 1839
- Genus Pholoëe Marion & Bobretzky, 1875 accepted as Pholoe Johnston, 1839
- Genus Pholoides Pruvot, 1895
- Genus Pisione Grube, 1857
- Genus Pisionella Hartman, 1939
- Genus Pisionella Aiyar & Alikunhi, 1940 accepted as Pisionidens Aiyar & Alikunhi, 1943
- Genus Pisionidens Aiyar & Alikunhi, 1943
- Genus Pottsipelogenia Pettibone, 1997
- Genus Praegeria Southern, 1914 accepted as Pisione Grube, 1857
- Species Praegeria complexa Alikuhni, 1942 accepted as Pisione complexa (Alikuhni, 1942)
- Species Praegeria gopalai Alikuhni, 1941
- Species Praegeria remota Southern, 1914 accepted as Pisione remota (Southern, 1914)
- Genus Prageria Chamberlin, 1919
- Genus Psammolyce Kinberg, 1856
- Genus Sicalion Monticelli, 1888 accepted as Sigalion Audouin & Milne Edwards in Cuvier, 1830
- Genus Sigalion Audouin & Milne Edwards in Cuvier, 1830
- Genus Stenelais Schmarda, 1861 accepted as Sthenelais Kinberg, 1856
- Genus Sthelenais Pruvot, 1895 accepted as Sthenelais Kinberg, 1856
- Genus Sthenalais Malaquin, 1893 accepted as Sthenelais Kinberg, 1856
- Genus Sthenelais Kinberg, 1856
- Genus Sthenelanella Moore, 1910
- Genus Sthenolepis Willey in Herdman, 1905
- Genus Sygalion Quatrefages, 1843 accepted as Sigalion Audouin & Milne Edwards in Cuvier, 1830
- Genus Sylloides Nolte, 1941 accepted as Pisione Grube, 1857
- Genus Thalanessa Chamberlin, 1919 accepted as Thalenessa Baird, 1868
- Genus Thalanessa Baird emend McIntosh, 1885 accepted as Thalenessa Baird, 1868
- Genus Thalenessa McIntosh, 1885 accepted as Euthalenessa Darboux, 1900
- Genus Thalenessa Baird, 1868 accepted as Sigalion Audouin & Milne Edwards in Cuvier, 1830
- Genus Willeysthenelais Pettibone, 1971
- 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 Aciculata
- Order Amphinomorpha
- Order Athecanephria
- Order Canalipalpata
- Order Capitellida
- Order Chaetopterida
- Order Cirratulida
- Order Cossurida
- Order Ctenodrilida
- Order Dinophilida
- Order Errantida †
- Order Eunicemorpha
- Order Flabelligerida
- Order Magelonida
- Order Myzostomida
- Order Nerillida
- Order Opheliida
- Order Orbiniida
- Order Oweniida
- Order Phyllodocemorpha
- 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 †
- Genus Pseudoarenicola Liu & Yang, 1991 †
- 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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