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 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
- 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
- Species Nauphanta brasiliensis Hansen, 1882 accepted as Marphysa brasiliensis (Hansen, 1882)
- Species Nauphanta celox Greeff, 1876 accepted as Alciopa reynaudi Audouin & Milne Edwards, 1833
- Species Nauphanta corallina Kinberg, 1865 accepted as Marphysa corallina (Kinberg, 1865)
- Species Nauphanta mossambica (Peters, 1855) accepted as Marphysa mossambica (Peters, 1854)
- Species Nauphanta novaehollandiae Kinberg, 1865
- Species Nauphanta spectabilis Greeff, 1876 accepted as Alciopa reynaudi Audouin & Milne Edwards, 1833
- 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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