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
- Family Archaeoprionidae Mierzejewski & Mierzejewska, 1975 †
- Family Atraktoprionidae Kielan-Jaworowska, 1966 †
- Family Conjungaspidae Hints, 1999 †
- Family Dinophilidae Macalister, 1876
- Family Diurodrilidae Kristensen & Niilonen, 1982
- Family Dorvilleidae Chamberlin, 1919
- Family Eunicida incertae sedis
- Family Eunicidae Berthold, 1827
- Genus Aciculomarphysa Hartmann-Schröder in Hartmann-Schröder & Zibrowius, 1998
- Genus Aglaurides Ehlers, 1866 accepted as
- Genus Amphelothrix Chamberlin, 1919 accepted as Marphysa Quatrefages, 1866
- Genus Amphiro Kinberg, 1865 accepted as Marphysa Quatrefages, 1866
- Genus Amphiron Chamberlin, 1919 accepted as Marphysa Quatrefages, 1866
- Genus Aphelothrix Chamberlin, 1919 accepted as Marphysa Quatrefages, 1866
- Genus Blainvillea Quatrefages, 1866 accepted as Lysidice Lamarck, 1818
- Genus Bleinvillea Grube, 1878 accepted as Blainvillea Quatrefages, 1866
- Genus Eriphyle Kinberg, 1865 accepted as Eunice Cuvier, 1817
- Genus Esconites Thompson & Johnson, 1977 †
- Genus Eunice Cuvier, 1817
- Species Eunice aciculata (Treadwell, 1922)
- Species Eunice adriatica Schmarda, 1861
- Species Eunice aedificatrix Monro, 1933
- Species Eunice aenea Blanchard in Gay, 1849
- Species Eunice aequabilis Grube, 1878
- Species Eunice afra Peters, 1854
- Species Eunice afuerensis Hartman, 1944
- Species Eunice alata Miura, 1977
- Species Eunice americana Hartman, 1944
- Species Eunice amoureuxi Rullier, 1974
- Species Eunice amphiheliae Marion in Filhol, 1885
- Species Eunice anceps Pruvot in Fauvel, 1930 accepted as Eunice pruvoti Fauchald, 1992
- Species Eunice annulicirrata Miura, 1986
- Species Eunice annulicornis Johnston, 1865
- Species Eunice antarctica Baird, 1869
- Species Eunice antennata (Savigny, 1820)
- Species Eunice antennata (Savigny in Lamarck, 1818)
- Species Eunice antillensis Ehlers, 1887 accepted as Eunice websteri Fauchald, 1969
- Species Eunice antipathum (Pourtales, 1867)
- Species Eunice aphroditois (Pallas, 1788)
- Species Eunice arcturi (Treadwell, 1928)
- Species Eunice arenosa Kinberg, 1865
- Species Eunice argentinensis (Treadwell, 1929)
- Species Eunice armillata (Treadwell, 1922)
- Species Eunice articulata Ehlers, 1887
- Species Eunice atlantica Kinberg, 1865
- Species Eunice attenuata Grube, 1866
- Species Eunice aucklandica Averincev, 1972
- Species Eunice auriculata Treadwell, 1900 accepted as Euniphysa auriculata (Treadwell, 1900)
- Species Eunice australis Quatrefages, 1866
- Species Eunice austropacifica Orensanz, 1990
- Species Eunice badia Grube, 1878
- Species Eunice balfouriana (McIntosh, 1885)
- Species Eunice barvicensis McIntosh, 1885
- Species Eunice bassensis McIntosh, 1885
- Species Eunice bellii Audouin & Milne Edwards, 1833 accepted as Marphysa bellii (Audouin & Milne-Edwards, 1833)
- Species Eunice benedicti (Verrill, 1885)
- Species Eunice bertoloni (Delle Chiaje, 1828)
- Species Eunice biannulata Moore, 1904
- Species Eunice bicirrata Rullier, 1964
- Species Eunice biformicirrata (Treadwell, 1922)
- Species Eunice bilobata Treadwell, 1906
- Species Eunice binominata Quatrefages, 1866
- Species Eunice bipapillata Grube, 1866
- Species Eunice bitorquata Grube, 1870
- Species Eunice borneensis (Grube, 1878)
- Species Eunice bottae Quatrefages, 1866
- Species Eunice bowerbanki Baird, 1869
- Species Eunice brasiliensis Kinberg, 1865
- Species Eunice brevis (Ehlers, 1887)
- Species Eunice bucciensis (Treadwell, 1921)
- Species Eunice burmeisteri Müller in Grube, 1878
- Species Eunice caeca Shisko, 1982
- Species Eunice capensis Schmarda, 1861 accepted as Marphysa capensis (Schmarda, 1861)
- Species Eunice cariboea Grube, 1856
- Species Eunice cedroensis Fauchald, 1970
- Species Eunice challengeriae McIntosh, 1885
- Species Eunice chicasi Leon-Gonzalez, Rivera & Romero, 2004
- Species Eunice cincta (Kinberg, 1865)
- Species Eunice cingulata Claparède, 1868 accepted as Eunice purpurea Grube, 1866
- Species Eunice cirribranchis Grube, 1870
- Species Eunice cirrobranchiata McIntosh, 1885 accepted as Eunice filamentosa Grube & Örsted in Grube, 1856
- Species Eunice claparedii Quatrefages, 1866 accepted as Eunice torquata Quatrefages, 1866
- Species Eunice coccinea Grube, 1878
- Species Eunice coccinioides Augener, 1922
- Species Eunice collaris Grube, 1870
- Species Eunice collini Augener, 1906
- Species Eunice colombia Ardila, Fauchald & Lattig, 2005
- Species Eunice complanata Grube, 1877
- Species Eunice congesta Marenzeller, 1879 accepted as Eunice vittata (Delle Chiaje, 1828)
- Species Eunice conglomerans Ehlers, 1887 accepted as Eunice denticulata Webster, 1884
- Species Eunice contingens (Chamberlin, 1919)
- Species Eunice crassitentaculata (Treadwell, 1922)
- Species Eunice culebra Treadwell, 1901 accepted as Eunice cariboea Grube, 1856
- Species Eunice curticirrus Knox, 1960
- Species Eunice denticulata Webster, 1884
- Species Eunice depressa Schmarda, 1861 accepted as Marphysa depressa (Schmarda, 1861)
- Species Eunice dilatata Grube, 1877
- Species Eunice djiboutiensis Gravier, 1900
- Species Eunice donathi Carrera-Parras & Salazar-Vallejo, 1998
- Species Eunice dubia Woodworth, 1907 accepted as Palola dubia (Woodworth, 1907)
- Species Eunice dubitata Fauchald, 1974
- Species Eunice dubitatus Fauchald, 1974
- Species Eunice ebranchiata Quatrefages, 1866
- Species Eunice edwardsi McIntosh, 1885
- Species Eunice edwinlinkae Carrera-Parras & Salazar-Vallejo, 1998
- Species Eunice ehlersi Gravier, 1900
- Species Eunice eimeorum Fauchald, 1992
- Species Eunice elegans (Verrill, 1900)
- Species Eunice elseyi Baird, 1869
- Species Eunice elsyi Baird, 1869
- Species Eunice enteles (Chamberlin, 1918) accepted as Eunice monilifer (Chamberlin, 1919)
- Species Eunice enteles (Chamberlin, 1918) accepted as Leodice enteles Chamberlin, 1918
- Species Eunice equibranchiata McIntosh, 1885
- Species Eunice eugeniae Fauchald, 1992
- Species Eunice excariboea Fauchald, 1992
- Species Eunice fasciata McIntosh, 1910 accepted as Eunice harassii Audouin & Milne Edwards, 1834
- Species Eunice fauchaldi Miura, 1986
- Species Eunice fauveli Gravier, 1900
- Species Eunice fauveli Gravier, 1901
- Species Eunice fijiensis Baird, 1869
- Species Eunice filamentosa Grube & Örsted in Grube, 1856
- Species Eunice fimbriata Grube, 1870
- Species Eunice flaccida Grube, 1869
- Species Eunice flavapunctata (Treadwell, 1922)
- Species Eunice flavocuprea Grube, 1869
- Species Eunice flavofasciata Grube, 1878
- Species Eunice flavopicta Izuka, 1912 accepted as Eunice aphroditois (Pallas, 1788)
- Species Eunice floridana (Pourtalès, 1867) accepted as Eunice norvegica (Linnaeus, 1767)
- Species Eunice franklini Monro, 1924
- Species Eunice frauenfeldi Grube, 1868 accepted as Eunice magellanica McIntosh, 1885
- Species Eunice fucata Ehlers, 1887
- Species Eunice fuscafasciata (Treadwell, 1922)
- Species Eunice fusicirris Grube, 1878
- Species Eunice gagzoi Augener, 1922
- Species Eunice gagzoi Augener, 1924 accepted as Eunice gagzoi Augener, 1922
- Species Eunice gaimardi Quatrefages, 1866
- Species Eunice gallica (Savigny in Lamarck, 1818)
- Species Eunice goodei Fauchald, 1992
- Species Eunice goodsiri (McIntosh, 1885)
- Species Eunice gracilicirrata (Treadwell, 1922)
- Species Eunice gracilis Moore, 1903 accepted as Eunice kobiensis McIntosh, 1885
- Species Eunice gravieri Fauvel, 1911
- Species Eunice grubei Gravier, 1900
- Species Eunice guanica (Treadwell, 1921)
- Species Eunice guildingi Baird, 1869
- Species Eunice gunneri Storm, 1879 accepted as Eunice norvegica (Linnaeus, 1767)
- Species Eunice guttata Baird, 1869
- Species Eunice hamata Schmarda, 1861 accepted as Marphysa hamata (Schmarda, 1861)
- Species Eunice harassii Audouin & Milne Edwards, 1834
- Species Eunice hartmanae Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice havaica Kinberg, 1865
- Species Eunice hawaiensis Treadwell, 1906
- Species Eunice hawaiiensis Treadwell, 1906
- Species Eunice hernandezi Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice heterochaeta Quatrefages, 1866
- Species Eunice hirschi Fauchald, 1992
- Species Eunice hispanica (Savigny in Lamarck, 1818)
- Species Eunice ibarzabalae Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice imogena (Monro, 1924)
- Species Eunice impexa Grube, 1878
- Species Eunice indica Kinberg, 1865
- Species Eunice insolata Amoureux, 1977
- Species Eunice insolita Amoureux, 1977 accepted as Fauchaldius insolita (Amoureux, 1978)
- Species Eunice insularis Nogueira, Steiner & Amaral, 2001
- Species Eunice interrupta Treadwell, 1906
- Species Eunice investigatoris Fauvel, 1932
- Species Eunice jagori Grube, 1878
- Species Eunice januarii Grube, 1881 accepted as Marphysa januarii (Grube, 1881)
- Species Eunice japonica Fauchald, 1992
- Species Eunice jeffreysii McIntosh, 1903 accepted as Euniphysa jeffreysii (McIntosh, 1903)
- Species Eunice johnsoni Hartman, 1954
- Species Eunice kerguelensis Averincev, 1972
- Species Eunice kinbergi Ehlers, 1868
- Species Eunice kobiensis McIntosh, 1885
- Species Eunice kristiani Hartmann-Schröder & Zibrowius, 1998
- Species Eunice lanai Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice langi (Treadwell, 1943)
- Species Eunice laticeps Ehlers, 1868
- Species Eunice laurillardi Quatrefages, 1866
- Species Eunice leptocirrus Grube, 1870
- Species Eunice leucodon Ehlers, 1901
- Species Eunice leuconuchalis Benham, 1900
- Species Eunice leucosticta Grube, 1878
- Species Eunice levibranchia (Hoagland, 1920)
- Species Eunice limosa Ehlers, 1868
- Species Eunice lita (Chamberlin, 1919)
- Species Eunice longicirrata Webster, 1884
- Species Eunice longicirrata (Kinberg, 1865)
- Species Eunice longicirris Grube, 1870
- Species Eunice longicornis Grube, 1866
- Species Eunice longiqua Kinberg, 1865 accepted as Eunice antennata (Savigny in Lamarck, 1818)
- Species Eunice longisetis Webster, 1884 accepted as Eunice macrobranchia (Schmarda, 1861)
- Species Eunice lucei Grube, 1856
- Species Eunice macrobranchia (Schmarda, 1861)
- Species Eunice macrochaeta Schmarda, 1861
- Species Eunice madeirensis Baird, 1869
- Species Eunice magellanica McIntosh, 1885
- Species Eunice magnifica Grube, 1866
- Species Eunice makemoana (Chamberlin, 1919)
- Species Eunice manihine Longbottom, 1970
- Species Eunice manorae Aziz, 1938
- Species Eunice marconii Nogueira, Steiner & Amaral, 2001
- Species Eunice marcusi Zanol, Paiva & Attolini, 2000
- Species Eunice marenzelleri Gravier, 1900
- Species Eunice margaritacea Williams, 1853
- Species Eunice margariticacea Fischli, 1900
- Species Eunice marianae Hartmann-Schröder & Zibrowius, 1998
- Species Eunice marovoi Gibbs, 1971
- Species Eunice martensi Grube, 1878
- Species Eunice masudai Miura, 1986
- Species Eunice maxima Quatrefages, 1866 accepted as Eunice roussaei Quatrefages, 1866
- Species Eunice medicina Moore, 1903
- Species Eunice megabranchia Fauchald, 1970
- Species Eunice megalodus Grube, 1878
- Species Eunice metatropos Hanley, 1986
- Species Eunice microprion Marenzeller, 1879
- Species Eunice mikeli Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice mindanavensis McIntosh, 1885
- Species Eunice minuta Grube, 1850 accepted as Eunice vittata (Delle Chiaje, 1828)
- Species Eunice misakiensis (Miura, 1987)
- Species Eunice miurai Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice modesta Grube, 1866
- Species Eunice monilifer (Chamberlin, 1919)
- Species Eunice mossambica Peters, 1854
- Species Eunice mucronata Moore, 1903
- Species Eunice multicylindri Shisko, 1981
- Species Eunice multipectinata Moore, 1911
- Species Eunice murrayi McIntosh, 1885
- Species Eunice musorstomica Hartmann-Schröder & Zibrowius, 1998
- Species Eunice mutabilis Gravier, 1901
- Species Eunice mutabilis Gravier, 1900
- Species Eunice mutilata Webster, 1884
- Species Eunice mutilatoides Augener, 1924 accepted as Eunice mutilata Webster, 1884
- Species Eunice narconi Baird, 1869
- Species Eunice neocaledoniensis Lechapt, 1992
- Species Eunice nesiotes (Chamberlin, 1919)
- Species Eunice nicidioformis Treadwell, 1906
- Species Eunice nigricans Schmarda, 1861 accepted as Eunice macrobranchia (Schmarda, 1861)
- Species Eunice nonatoi Carrera-Parra & Salazar-Vallejo, 1998
- Species Eunice northioidea Moore, 1903
- Species Eunice norvegica (Linnaeus, 1767)
- Species Eunice notata (Treadwell, 1921)
- Species Eunice oerstedii Stimpson, 1853
- Species Eunice oliga (Chamberlin, 1919)
- Species Eunice orensanzi Leon-Gonzalez, 1991
- Species Eunice ornata Andrews, 1891
- Species Eunice ovalifera Fauvel, 1936
- Species Eunice pacifica Kinberg, 1865
- Species Eunice palauensis Okuda, 1937
- Species Eunice paloloides Moore, 1909 accepted as Palola paloloides (Moore, 1909)
- Species Eunice panamena (Chamberlin, 1919)
- Species Eunice papeetensis (Chamberlin, 1919)
- Species Eunice parasegregata Hartmann-Schröder, 1965
- Species Eunice parca Grube, 1878
- Species Eunice parva Hansen, 1882 accepted as Eunice rubra Grube, 1856
- Species Eunice parvibranchis Grube, 1870
- Species Eunice paucibranchis Grube, 1866 accepted as Eunice australis Quatrefages, 1866
- Species Eunice paupera Grube, 1878
- Species Eunice pauroneurata (Chamberlin, 1919)
- Species Eunice pectinata Grube, 1869
- Species Eunice pelamidis Quatrefages, 1866
- Species Eunice pellucida Kinberg, 1865 accepted as Eunice vittata (Delle Chiaje, 1828)
- Species Eunice pennata (O.F. Müller, 1776)
- Species Eunice pennate (Müller, 1776) accepted as Eunice pennata (O.F. Müller, 1776)
- Species Eunice perimensis Gravier, 1900
- Species Eunice perimensis Gravier, 1901
- Species Eunice perrieri Gravier, 1900
- Species Eunice petersi Fauchald, 1992
- Species Eunice philippinensis Hartmann-Schröder & Zibrowius, 1998
- Species Eunice philocorallia Buchanan, 1893
- Species Eunice pinnata (Müller, 1776) accepted as Nereis pinnata Müller, 1776
- Species Eunice plessisi Rullier, 1972
- Species Eunice plicata Baird, 1869
- Species Eunice polybranchia (Verrill, 1880)
- Species Eunice prayensis Kinberg, 1865
- Species Eunice procera Grube, 1866
- Species Eunice profunda Miura, 1987
- Species Eunice prognatha McIntosh, 1885
- Species Eunice pruvoti Fauchald, 1992
- Species Eunice pulvinopalpata Fauchald, 1982
- Species Eunice punctata (Risso, 1826)
- Species Eunice punctata Peters, 1854 accepted as Eunice petersi Fauchald, 1992
- Species Eunice punctata Grube, 1856 accepted as Eunice binominata Quatrefages, 1866
- Species Eunice purpurea Grube, 1866
- Species Eunice pycnobranchiata McIntosh, 1885
- Species Eunice quadrioculata Grube, 1856 accepted as Marphysa quadrioculata (Grube, 1856)
- Species Eunice quinquefida Moore, 1903
- Species Eunice quoya Quatrefages, 1866
- Species Eunice reducta Fauchald, 1970
- Species Eunice riojai León-González, 1988
- Species Eunice rissoi Quatrefages, 1866 accepted as Eunice harassii Audouin & Milne Edwards, 1834
- Species Eunice rosaurae Monro, 1939
- Species Eunice roussaei Quatrefages, 1866
- Species Eunice rousseai Quatrefages, 1866
- Species Eunice rousseaui Quatrefages, 1865
- Species Eunice rubella Knox, 1951
- Species Eunice rubra Grube, 1856
- Species Eunice rubrivittata (Treadwell, 1921)
- Species Eunice rubrocincta Ehlers, 1868
- Species Eunice rullieri Fauchald, 1992
- Species Eunice salvadorensis Leon-Gonzalez, Rivera & Romero, 2004
- Species Eunice savignyi Grube, 1878
- Species Eunice schemacephala Schmarda, 1861
- Species Eunice schemcephala
- Species Eunice schizobranchia Claparède, 1870
- Species Eunice scombrinis Quatrefages, 1866
- Species Eunice sebastiani Nonato, 1965
- Species Eunice segregata (Chamberlin, 1919)
- Species Eunice semisegregata Fauchald, 1969
- Species Eunice senta (Moore, 1902)
- Species Eunice siciliensis (Grube, 1840) accepted as Palola siciliensis (Grube, 1840)
- Species Eunice simplex Peters, 1854 accepted as Palola simplex (Peters, 1854)
- Species Eunice solita Amoureux, 1978
- Species Eunice sonorae Fauchald, 1970
- Species Eunice spinea Miura, 1977 accepted as Euniphysa spinea (Miura, 1977)
- Species Eunice splendida Grube, 1856
- Species Eunice spongicola (Treadwell, 1921)
- Species Eunice stanleyi Fauchald, 1992
- Species Eunice stigmatura (Verrill, 1900)
- Species Eunice stragulum Grube, 1878
- Species Eunice subdepressa Grube, 1866
- Species Eunice suviensis (Treadwell, 1922)
- Species Eunice taenia Claparède, 1864
- Species Eunice tahitana Kinberg, 1865
- Species Eunice tanseiae Miura, 1986
- Species Eunice tentaculata Quatrefages, 1866
- Species Eunice tenuicirrata (Verrill, 1900)
- Species Eunice tenuis (Treadwell, 1921)
- Species Eunice teretiuscula Schmarda, 1861 accepted as Marphysa teretiuscula (Schmarda, 1861)
- Species Eunice thomasiana Augener, 1924
- Species Eunice tibiana (Pourtales, 1967)
- Species Eunice torquata Quatrefages, 1866
- Species Eunice torresiensis McIntosh, 1885
- Species Eunice tovarae Carrera-Parra & Salazar-Vallejo, 2011
- Species Eunice triantennata (Risso, 1826) accepted as Marphysa triantennata (Risso, 1826)
- Species Eunice tribranchiata McIntosh, 1885
- Species Eunice tridentata Ehlers, 1905
- Species Eunice tristriata Grube, 1870
- Species Eunice tubicola (Treadwell, 1922)
- Species Eunice tubifex Crossland, 1904
- Species Eunice unibranchiata Imajima, 2006
- Species Eunice unidentata Rioja, 1962
- Species Eunice unifrons (Verrill, 1900)
- Species Eunice uschakovi Wu, Sun & Liu, 2013
- Species Eunice valenciennesii Grube, 1878
- Species Eunice valens (Chamberlin, 1919)
- Species Eunice valida Gravier, 1900
- Species Eunice validissima Grube, 1866 accepted as Eunice roussaei Quatrefages, 1866
- Species Eunice validobranchiata Monro, 1937
- Species Eunice violacea Grube, 1856 accepted as Eunice macrobranchia (Schmarda, 1861)
- Species Eunice violaceomaculata Ehlers, 1887
- Species Eunice vittata (Delle Chiaje, 1828)
- Species Eunice vittatopsis Fauchald, 1970
- Species Eunice vivida Stimpson, 1853
- Species Eunice wasinensis Fauchald, 1992
- Species Eunice websteri Fauchald, 1969
- Species Eunice weintraubi Lu & Fauchald, 1998
- Species Eunice woodwardi Baird, 1869
- Species Eunice wui Lu & Fauchald, 1998
- Species Eunice yamamotoi Miura, 1986
- Species Eunice zonata Delle Chiaje, 1841
- Genus Eunice Rafinesque, 1815
- Genus Eunicea Bosch, 1817 accepted as Eunice Cuvier, 1817
- Genus Euniphysa Wesenberg-Lund, 1949
- Genus Euuice Stossich, 1882 accepted as Eunice Cuvier, 1817
- Genus Fauchaldius Carrera-Parra & Salazar Vallejo, 1998
- Genus Heteromarphysa Verrill, 1900
- Genus Heterophysa Shen & Wu, 1990 accepted as Euniphysa Wesenberg-Lund, 1949
- Genus Laodice Guérin-Méneville, 1844
- Genus Leodice Lamarck, 1818
- Genus Leodicea Valenciennes, 1833
- Genus Leodicoe Bory, 1831
- Genus Lisidice Risso, 1826
- Genus Lithognatha Stewart, 1881 accepted as Palola Gray, 1847
- Genus Lycidice Westwood in Blyth, 1840 accepted as Lysidice Lamarck, 1818
- Genus Lysibranchia Cantone, 1983 accepted as Marphysa Quatrefages, 1866
- Genus Lysidia Schweigger, 1820
- Genus Lysidica Burmeister, 1837
- Genus Lysidice Lamarck, 1818
- Genus Macduffia McIntosh, 1885 accepted as Marphysa Quatrefages, 1866
- Genus Marphisia Westwood in Blyth, 1840 accepted as Marphysa Quatrefages, 1866
- Genus Marphya Pruvot & Racovitza, 1895 accepted as Marphysa Quatrefages, 1866
- Genus Marphysa Quatrefages, 1866
- Genus Mayeria Verrill, 1900 accepted as Eunice Cuvier, 1817
- Genus Morphysa Grube, 1869 accepted as Marphysa Quatrefages, 1866
- Genus Nauficaa Grube, 1878
- Genus Nauphanta Kinberg, 1865 accepted as Marphysa Quatrefages, 1866
- Genus Nauphante Carus, 1884 accepted as Nauphanta Kinberg, 1865
- Genus Nausica Chamberlin, 1919
- Genus Nausicaa Kinberg, 1865 accepted as Marphysa Quatrefages, 1866
- Genus Nausicea McIntosh, 1910
- Genus Nematonereis Schmarda, 1861 accepted as Lysidice Lamarck, 1818
- Genus Nereidice Blainville, 1828 accepted as Lysidice Lamarck, 1818
- Genus Nereidon Griffith, 1833
- Genus Nereidonta Blainville, 1828 accepted as Palola Gray, 1847
- Genus Nereidonte Lamarck, 1838
- Genus Nereidontha Chiaje, 1841
- Genus Nereidontis Desmarest, 1846
- Genus Nereiodonta Quatrefages in Quatrefages (Vaillant), 1866
- Genus Nicidion Kinberg, 1865
- Genus Nicidon McIntosh, 1908 accepted as Eunice Cuvier, 1817
- Genus Nicidon [auctt.] accepted as Nicidion Kinberg, 1865
- Genus Nikidion McIntosh, 1910 accepted as Eunice Cuvier, 1817
- Genus Palola Gray, 1847
- Genus Palolo Macdonald, 1858 accepted as Palola Gray, 1847
- Genus Palpiglossus Wagner, 1885
- Genus Paraeuniphysa Wu & He, 1988 accepted as Euniphysa Wesenberg-Lund, 1949
- Genus Paramarphysa Ehlers, 1887 accepted as Marphysa Quatrefages, 1866
- Genus Paucibranchia Molina-Acevedo, 2018
- Genus Pseudopalolo Friedländer, 1907
- Genus Tibiana Lamarck, 1816 accepted as Eunice Cuvier, 1817
- Genus Treadwellphysa Molina-Acevedo & Carrera-Parra, 2017
- Family Euniphysidae accepted as Eunicidae Berthold, 1827
- Family Hartmaniellidae Imajima, 1977
- Family Histriobdellidae Vaillant, 1890
- Family Iphitimidae Fauchald, 1970 accepted as Dorvilleidae Chamberlin, 1919
- Family Kalloprionidae Kielan-Jaworowska, 1966 †
- Family Kielanoprionidae Szaniawski, 1968 †
- Family Lumbrinereidae Malmgren, 1867 accepted as Lumbrineridae Schmarda, 1861
- Family Lumbrineridae Schmarda, 1861
- Family Lysaretidae Kinberg, 1865 accepted as Lumbrineridae Schmarda, 1861
- Family Mochtyellidae Kielan-Jaworowska, 1966 †
- Family Onuphidae Kinberg, 1865
- Family Paulinitidae Lange, 1947 †
- Family Polychaetaspidae Kielan-Jaworowska, 1966 †
- Family Polychaeturidae Kozlowski, 1956 †
- Family Ramphoprionidae Kielan-Jaworowska, 1966 †
- Family Rhytiprionidae Kielan-Jaworowska, 1966 †
- Family Skalenoprionidae Kielan-Jaworowska, 1962 †
- Family Symmetroprionidae Kielan-Jaworowska, 1966 †
- Family Tetraprionidae Kielan-Jaworowska, 1966 †
- Family Tretoprionidae Hints, 1999 †
- Family Xianioprionidae Kielan-Jaworowska, 1962 †
- Order Phyllodocida
- 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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