Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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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 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
- Family Apistobranchidae Mesnil & Caullery, 1898
- Family Disomidae accepted as Trochochaetidae Pettibone, 1963
- Family Poecilochaetidae Hannerz, 1956
- Family Spionidae Sars, 1861
- Genus Amphipolydora Blake, 1983
- Genus Anaspio Chamberlin, 1920 accepted as Prionospio Malmgren, 1867
- Genus Aonidella López-Jamar, 1989
- Genus Aonides Claparède, 1864
- Genus Aonopsis Wagner, 1885
- Genus Apoprionospio Foster, 1969 accepted as Prionospio Malmgren, 1867
- Genus Apoprionospio [auctorum] accepted as Prionospio Malmgren, 1867
- Genus Appelloefia Sikorski, Gunton & Pavlova, 2017 accepted as Laonice Malmgren, 1867
- Genus Aquilaspio Foster, 1971 accepted as Prionospio Malmgren, 1867
- Genus Aquilaspio [auctorum] accepted as Prionospio Malmgren, 1867
- Genus Aricideopsis Johnson, 1901 accepted as Laonice Malmgren, 1867
- Genus Asetocalamyzas Tzetlin, 1985 accepted as Scolelepis Blainville, 1828
- Genus Atherospio Mackie & Duff, 1986
- Genus Aurospio Maciolek, 1981
- Genus Aurospira accepted as Aurospio Maciolek, 1981
- Genus Australospio Blake & Kudenov, 1978
- Genus Blydora Rouville, 1905 † accepted as Polydora Bosc, 1802
- Genus Boccardia Carazzi, 1893
- Genus Boccardiella Blake & Kudenov, 1978
- Genus Carazzia Mesnil, 1896
- Genus Carazziella Blake & Kudenov, 1978
- Genus Carrazia Chamberlin, 1919
- Genus Carzziella accepted as Carazziella Blake & Kudenov, 1978
- Genus Cheironotus Costa, 1861
- Genus Colobranchus Schmarda, 1861 accepted as Malacoceros Quatrefages, 1843
- Genus Colohranchus Tauber, 1879
- Genus Ctenospio Sars, 1867
- Genus Diplotes Cuvier, 1830 accepted as Polydora Bosc, 1802
- Genus Diplotis Montagu, 1816
- Genus Diplotis Garner, 1838
- Genus Diplotus McIntosh, 1915
- Genus Dipolydora Verrill, 1881
- Genus Dispio Hartman, 1951
- Genus Euspio McIntosh, 1915 accepted as Spio Fabricius, 1785
- Genus Gisela Müller in Grube, 1858
- Genus Glandulospio Meißner, Bick, Guggolz & Götting, 2014
- Genus Glyphochaeta Bick, 2005
- Genus Hekaterobranchus Buchanan, 1890 accepted as Streblospio Webster, 1879
- Genus Kinbergella McIntosh, 1909 accepted as Prionospio Malmgren, 1867
- Genus Laonice Malmgren, 1867
- Genus Laubieriellus Maciolek, 1981
- Genus Leipoceras Möbius, 1874 accepted as Dipolydora Verrill, 1881
- Genus Leipoceros Tauber, 1879
- Genus Leucadore Parfitt, 1871 accepted as Polydora Bosc, 1802
- Genus Leucodora Claparède, 1863 accepted as Polydora Bosc, 1802
- Genus Leucodore Johnston, 1838 accepted as Polydora Bosc, 1802
- Genus Leucodorum Örsted, 1843 accepted as Polydora Bosc, 1802
- Genus Lidaspio
- Genus Lindaspio Blake & Maciolek, 1992
- Genus Malacoceros Quatrefages, 1843
- Genus Mandane Kinberg, 1866 accepted as Laonice Malmgren, 1867
- Genus Marenzelleria Mesnil, 1896
- Genus Mesospio Gravier, 1911 accepted as Microspio Mesnil, 1896
- Genus Microspio Mesnil, 1896
- Genus Minuspio Foster, 1971 accepted as Prionospio Malmgren, 1867
- Genus Minuspio [auctorum] accepted as Prionospio Malmgren, 1867
- Genus Moranis Chamberlin, 1919 accepted as Spiophanes Grube, 1860
- Genus Morants Chamberlin, 1919 accepted as Spiophanes Grube, 1860
- Genus Neoboccardia Buzhinskaja, 1985 accepted as Boccardia Carazzi, 1893
- Genus Neopygospio Berkeley & Berkeley, 1954 accepted as Pseudopolydora Czerniavsky, 1881
- Genus Nerina Burmeister, 1856 accepted as Scolelepis Blainville, 1828
- Genus Nerine Johnston, 1838 accepted as Scolelepis Blainville, 1828
- Species Nerine agilis Verrill, 1873 accepted as Scolelepis squamata (O.F. Müller, 1806)
- Species Nerine alaskensis accepted as Scolelepis alaskensis (Treadwell, 1914)
- Species Nerine auriseta Claparède, 1868
- Species Nerine beata Williams, 1859
- Species Nerine bonnieri Mesnil, 1896 accepted as Scolelepis bonnieri (Mesnil, 1896)
- Species Nerine capensis McIntosh, 1924 accepted as Scolelepis squamata (O.F. Müller, 1806)
- Species Nerine cirrata Sars, 1851 accepted as Laonice cirrata (M. Sars, 1851)
- Species Nerine cirratulus (Delle Chiaje, 1831) accepted as Scolelepis cirratulus
- Species Nerine coniocephala Johnston, 1838 accepted as Scolelepis foliosa (Audouin & Milne Edwards, 1833)
- Species Nerine faughani Gallardo, 1968
- Species Nerine floroensis Saint-Joseph, 1894 accepted as Malacoceros girardi Quatrefages, 1843
- Species Nerine foliata Dalyell, 1853 accepted as Scolelepis foliosa (Audouin & Milne Edwards, 1833)
- Species Nerine foliosa (Audouin & Milne Edwards, 1833) accepted as Scolelepis foliosa (Audouin & Milne Edwards, 1833)
- Species Nerine heteropoda Webster, 1879 accepted as Scolelepis squamata (O.F. Müller, 1806)
- Species Nerine lefebvrei Gravier, 1905 accepted as Scolelepis lefebvrei (Gravier, 1905)
- Species Nerine longirostris (Quatrefages, 1843) accepted as Scolelepis longirostris (Quatrefages, 1843)
- Species Nerine macrochaeta Schmarda, 1861
- Species Nerine marcella Williams, 1851
- Species Nerine mesnili Bellan & Lagardere, 1971 accepted as Scolelepis mesnili (Bellan & Lagardere, 1971)
- Species Nerine minuta Treadwell, 1939 accepted as Scolelepis squamata (O.F. Müller, 1806)
- Species Nerine oligobranchia Chlebovitsch, 1959 accepted as Scolelepis oligobranchia (Chlebovitsch, 1959)
- Species Nerine oxycephala Sars, 1862 accepted as Aonides oxycephala (Sars, 1862)
- Species Nerine perrieri Fauvel, 1902 accepted as Scolelepis perrieri (Fauvel, 1902)
- Species Nerine sarsiana Claparède, 1869 accepted as Scolelepis foliosa (Audouin & Milne Edwards, 1833)
- Genus Nerinides Mesnil, 1896 accepted as Scolelepis Blainville, 1828
- Genus Nerinne Johnston, 1840 accepted as Scolelepis Blainville, 1828
- Genus Nerino Quatrefages in Quatrefages (Vaillant), 1866 accepted as Scolelepis Blainville, 1828
- Genus Nerinopsis Ehlers, 1913
- Genus Norgensia Sikorski, Gunton & Pavlova, 2017 accepted as Laonice Malmgren, 1867
- Genus Orthoprionospio Blake & Kudenov, 1978
- Genus Paraboccardia Rainer, 1973 accepted as Boccardia Carazzi, 1893
- Genus Paranerine Czerniavsky, 1881
- Genus Paraprionospio Caullery, 1914
- Genus Parascolelepis Maciolek, 1987
- Genus Paraspio Czerniavsky, 1881 accepted as Spio Fabricius, 1785
- Genus Pasithoe Rafinesque, 1815
- Genus Perialla Kinberg, 1866
- Genus Periptyches Grube, 1873 accepted as Prionospio Malmgren, 1867
- Genus Polidora Rafinesque, 1815 † accepted as Polydora Bosc, 1802
- Genus Polybranchia Potts, 1928
- Genus Polydora Bosc, 1802
- Genus Polydore Blainville, 1825 † accepted as Polydora Bosc, 1802
- Genus Polydorella Augener, 1914
- Genus Polydorichnus Ishikawa & Kase, 2007 †
- Genus Polydoru Czerniavsky, 1881 † accepted as Polydora Bosc, 1802
- Genus Polydorus Blainville, 1826 † accepted as Polydora Bosc, 1802
- Genus Polyodorus Massalongo, 1855 † accepted as Polydora Bosc, 1802
- Genus Prionospio Malmgren, 1867
- Genus Prionospio [auctorum] accepted as Prionospio Malmgren, 1867
- Genus Protopolydora Czerniavsky, 1881
- Genus Pseudatherospio Lovell, 1994
- Genus Pseudoleucodore Czerniavsky, 1881
- Genus Pseudomalacoceros Czerniavsky, 1881 accepted as Scolelepis Blainville, 1828
- Genus Pseudonerine Augener, 1926 accepted as Scolelepis Blainville, 1828
- Genus Pseudopolydora Czerniavsky, 1881
- Genus Pteriptyches Grube, 1872 accepted as Periptyches Grube, 1873
- Genus Pygophyllum Schmarda, 1861
- Genus Pygospio Claparède, 1863
- Genus Pygospiopsis Blake, 1983
- Genus Rhynchospio Hartman, 1936
- Genus Sarsiana Sikorski, Gunton & Pavlova, 2017 accepted as Laonice Malmgren, 1867
- Genus Scolecolepides Ehlers, 1907
- Genus Scolecolepis Malmgren, 1867 accepted as Scolelepis Blainville, 1828
- Genus Scolecolepis Agassiz, 1846 accepted as Scolelepis Blainville, 1828
- Genus Scolecolipis Chamberlin, 1919 accepted as Scolelepis Blainville, 1828
- Genus Scolelepe Westwood in Blyth, 1840 accepted as Scolelepis Blainville, 1828
- Genus Scolelepides
- Genus Scolelepis Blainville, 1828
- Genus Scolepis [auctt.] accepted as Scolelepis Blainville, 1828
- Genus Scolicolepis McIntosh, 1915 accepted as Scolelepis Blainville, 1828
- Genus Scololepis Attems, 1902 accepted as Scolelepis Blainville, 1828
- Genus Spio Fabricius, 1785
- Genus Spiogalea Aguirrezabalaga & Ceberio, 2005
- Genus Spiohanes accepted as Spiophanes Grube, 1860
- Genus Spione Örsted, 1844
- Genus Spionereis Sars, 1853
- Genus Spioneresis Sars, 1853 accepted as Spio Fabricius, 1785
- Genus Spionides Webster & Benedict, 1887 accepted as Laonice Malmgren, 1867
- Genus Spiophagnes Ehlers, 1874 accepted as Spiophanes Grube, 1860
- Genus Spiophane Quatrefages in Quatrefages (Vaillant), 1866 accepted as Spiophanes Grube, 1860
- Genus Spiophanella Fauchald & Hancock, 1981
- Genus Spiophanes Grube, 1860
- Genus Spo Cuvier, 1836 accepted as Spio Fabricius, 1785
- Genus Streblospio Webster, 1879
- Genus Tripolydora Woodwick, 1964
- Genus Uncinia Quatrefages, 1865
- Genus Xandaros Maciolek, 1981
- Family Trochochaetidae Pettibone, 1963
- Family Uncispionidae Green, 1982
- 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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