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
- 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
- Genus Amphidromus Hessle, 1925 accepted as Amphiduros Hartman, 1959
- Genus Amphiduropsis Pleijel, 2001
- Genus Amphiduros Hartman, 1959
- Genus Anoplonereis Giard, 1882 accepted as Oxydromus Grube, 1855
- Genus Bonuania Pillai, 1965
- Genus Castalia Savigny, 1822 accepted as Nereimyra Blainville, 1828
- Genus Cirrosyllis Schmarda, 1861
- Genus Costalia McIntosh, 1901 accepted as Nereimyra Blainville, 1828
- Genus Crassichaetae Perkins, 1984 accepted as Heteropodarke Hartmann-Schröder, 1962
- Genus Dalhousia McIntosh, 1885 accepted as Leocrates Kinberg, 1866
- Genus Dalhousiella McIntosh, 1901
- Genus Elisesione Salazar-Vallejo, 2016
- Genus Fallacia Quatrefages, 1866 accepted as Hesione Savigny in Lamarck, 1818
- Genus Fullacia Eisig, 1881
- Genus Gyptis Marion & Bobretzky in Marion, 1874
- Genus Gyptisa accepted as Gyptis Marion & Bobretzky in Marion, 1874
- Genus Halimede Rathke, 1843 accepted as Nereimyra Blainville, 1828
- Genus Halymede Quatrefages in Quatrefages (Vaillant), 1866
- Genus Herione Berthold in Latreille, 1827
- Genus Hesiobranchia Ruta & Pleijel, 2006
- Genus Hesiocaeca Hartman, 1965
- Genus Hesiodeira Blake & Hilbig, 1990
- Genus Hesiolyra Blake, 1985
- Genus Hesiona Guérin-Méneville, 1844
- Genus Hesione Savigny in Lamarck, 1818
- Genus Hesionella Friedrich, 1956 accepted as Fridericiella Hartmann-Schröder, 1959
- Genus Hesionella Wesenberg-Lund, 1950 accepted as Elisesione Salazar-Vallejo, 2016
- Genus Hesiospina Imajima & Hartman, 1964
- Genus Heteromorpha accepted as Heteropodarke Hartmann-Schröder, 1962
- Genus Heteropodarke Hartmann-Schröder, 1962
- Genus Ichthyohesione Uchida, 2004 accepted as Ichthyohesione Uchida in Uchida et al., 2019
- Genus Ichthyohesione Uchida in Uchida et al., 2019
- Genus Irma Grube, 1878 accepted as Oxydromus Grube, 1855
- Genus Kefersteinia Quatrefages, 1866 accepted as Psamathe Johnston, 1836
- Genus Keferstenia Hallez, 1890 accepted as Psamathe Johnston, 1836
- Genus Lamproderma Grube, 1877 accepted as Leocrates Kinberg, 1866
- Genus Lamprophaes Grube, 1867 accepted as Leocrates Kinberg, 1866
- Genus Lamprophaës Grube, 1867 accepted as Lamprophaes Grube, 1867
- Genus Leocrates Kinberg, 1866
- Genus Leocratides Ehlers, 1908
- Genus Liocrates Perrier, 1897 accepted as Leocrates Kinberg, 1866
- Genus Lizardia Pleijel & Rouse, 2005
- Genus Magalia Marion & Bobretzky in Marion, 1874 accepted as Syllidia Quatrefages, 1865
- Genus Mahesia Westheide, 2000
- Genus Mania Quatrefages, 1865
- Genus Micropodarke Okuda, 1938
- Genus Micropodarkea accepted as Micropodarke Okuda, 1938
- Genus Morgulia Eisig, 1910
- Genus Neogyptis Pleijel, Rouse, Sundkvist & Nygren, 2012
- Genus Neopodarke Hartman, 1965 accepted as Nereimyra Blainville, 1828
- Genus Nereimya accepted as Nereimyra Blainville, 1828
- Genus Nereimyra Blainville, 1828
- Genus Ophiodromus Sars, 1862 accepted as Oxydromus Grube, 1855
- Genus Orseis Ehlers, 1864 accepted as Oxydromus Grube, 1855
- Genus Orthodromus Ehlers, 1908 accepted as Oxydromus Grube, 1855
- Genus Oxydromus Grube, 1855
- Species Oxydromus adorsosetosus (Hartmann-Schröder, 1985)
- Species Oxydromus adspersus (Grube, 1874)
- Species Oxydromus agilis (Ehlers, 1864)
- Species Oxydromus angolaensis (Hartmann-Schröder, 1974)
- Species Oxydromus angustifrons (Grube, 1878)
- Species Oxydromus arenicolus La Greca, 1947
- Species Oxydromus aucklandicus Willey, 1902
- Species Oxydromus berrisfordi (Day, 1967)
- Species Oxydromus brevipalpa Hartmann-Schröder, 1959 accepted as Gyptis brevipalpa (Hartmann-Schröder, 1959)
- Species Oxydromus brevipodius (Uchida, 2004)
- Species Oxydromus brunnea Hartman, 1961 accepted as Gyptis brunnea (Hartman, 1961)
- Species Oxydromus bunbuku (Uchida, 2004)
- Species Oxydromus capensis Day, 1963 accepted as Podarkeopsis capensis (Day, 1963)
- Species Oxydromus constrictus (Uchida, 2004)
- Species Oxydromus didymocerus (Schmarda, 1861)
- Species Oxydromus fasciatus Grube, 1855 accepted as Oxydromus flexuosus (delle Chiaje, 1827)
- Species Oxydromus fauveli (Uchida, 2004)
- Species Oxydromus flexuosus (delle Chiaje, 1827)
- Species Oxydromus furcatus (Hartmann-Schröder, 1962)
- Species Oxydromus fuscescens Marenzeller, 1875
- Species Oxydromus guanicus (Hoagland, 1919)
- Species Oxydromus heteroculatus Hartmann-Schröder, 1965 accepted as Gyptis heteroculatus (Hartmann-Schröder, 1965)
- Species Oxydromus incomptus (Ehlers, 1912)
- Species Oxydromus latifrons (Grube, 1878)
- Species Oxydromus limicolus (Willey, 1905)
- Species Oxydromus lobatus Hessle, 1925 accepted as Gyptis lobatus (Hessle, 1925)
- Species Oxydromus longicirratus (Knox & Cameron, 1971)
- Species Oxydromus longifundus (Uchida, 2004)
- Species Oxydromus longisetis Grube, 1857 accepted as Dalhousiella longisetis (Grube, 1857)
- Species Oxydromus microantennatus (Hutchings & Murray, 1984)
- Species Oxydromus minutus (Hartmann-Schröder, 1959)
- Species Oxydromus mutilatus (Treadwell, 1901)
- Species Oxydromus notospinosus (Rosito, 1983)
- Species Oxydromus obscurus (Verrill, 1873)
- Species Oxydromus okudai (Uchida, 2004)
- Species Oxydromus pacificus Hessle, 1925 accepted as Gyptis pacificus (Hessle, 1925)
- Species Oxydromus pallidus Claparède, 1864
- Species Oxydromus parapallidus (Uchida, 2004)
- Species Oxydromus pelagicus (Rioja, 1923)
- Species Oxydromus propinquus (Marion & Bobretzky, 1875) accepted as Gyptis propinqua Marion & Bobretzky, 1875
- Species Oxydromus pugettensis (Johnson, 1901)
- Species Oxydromus raluanensis Augener, 1927 accepted as Gyptis raluanensis (Augener, 1927)
- Species Oxydromus spinapandens (Storch & Niggemann, 1967)
- Species Oxydromus spinosus (Ehlers, 1908)
- Species Oxydromus viridescens (Ehlers, 1864)
- Species Oxydromus vittata accepted as Gyptis vittata Webster & Benedict, 1887
- Species Oxydromus vittatus (Sars, 1862)
- Genus Paradalhousia Salazar-Vallejo, 2020
- Genus Paragyptis Pocklington, 1984 accepted as Gyptis Marion & Bobretzky in Marion, 1874
- Genus Parahesiocaeca Uchida, 2004 accepted as Parahesiocaeca Uchida in Uchida et al., 2019
- Genus Parahesiocaeca Uchida in Uchida et al., 2019
- Genus Parahesione Pettibone, 1956
- Genus Paralamprophaea Salazar-Vallejo, 2020
- Genus Paraleocrates Salazar-Vallejo, 2020
- Genus Parapodarke Czerniavsky, 1882
- Genus Parasyllidea Pettibone, 1961 accepted as Oxydromus Grube, 1855
- Genus Peribaea Quatrefages in Quatrefages (Vaillant), 1866 accepted as Periboea Ehlers, 1864
- Genus Periboea Ehlers, 1864
- Genus Pleijelius Salazar-Vallejo & Orensanz, 2006
- Genus Podarke Ehlers, 1864 accepted as Oxydromus Grube, 1855
- Genus Podarkeopsis Laubier, 1961
- Genus Psamate Quatrefages in Quatrefages (Vaillant), 1866 accepted as Psamathe Johnston, 1836
- Genus Psamathe Johnston, 1836
- Genus Psamathea accepted as Ophiodromus Sars, 1862
- Genus Psammate Sars, 1853 accepted as Psamathe Johnston, 1836
- Genus Psammate [auctt. misspelling] accepted as Psamathe Johnston, 1836
- Genus Pseudosyllidia Czerniavsky, 1882 accepted as Syllidia Quatrefages, 1865
- Genus Schmardiella Czerniavsky, 1882 accepted as Ophiodromus Sars, 1862
- Genus Sinohesione Westheide, Purschke & Mangerich, 1994
- Genus Sirsoe Pleijel, 1998
- Genus Stehpania Claparède, 1870
- Genus Stephania Claparède, 1870
- Genus Syllidea Chamberlin, 1919 accepted as Syllidia Quatrefages, 1865
- Genus Syllidia Quatrefages, 1865
- Genus Synsyllidia Uchida, 2004 accepted as Synsyllidia Uchida in Uchida et al., 2019
- Genus Synsyllidia Uchida in Uchida et al., 2019
- Genus Telamone Claparède, 1868
- Genus Tyrrhena Claparède, 1868 accepted as Leocrates Kinberg, 1866
- Genus Vrijenhoekia Pleijel, Rouse, Ruta, Wiklund & Nygren, 2008
- Genus Wesenbergia Hartman, 1955 accepted as Elisesione Salazar-Vallejo, 2016
- 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
- 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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