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
- 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
- Genus Acritagasyllis Lucas, San Martín & Sikorski, 2010
- Genus Alcyonosyllis Glasby & Watson, 2001
- Genus Alluandella Chamberlin, 1919 accepted as Alluaudella Gravier, 1905
- Genus Alluaudella Gravier, 1905 accepted as Odontosyllis Claparède, 1863
- Genus Ambliosyllis Quatrefages, 1865 accepted as Amblyosyllis Grube, 1857
- Genus Amblosyllis Grube, 1857
- Genus Amblyosillis Eisig, 1881 accepted as Amblyosyllis Grube, 1857
- Genus Amblyosillis Grube, 1857 accepted as Amblyosyllis Grube, 1857
- Genus Amblyosyllis Grube, 1857
- Genus Amytidea Parfitt, 1867
- Genus Amytis Savigny, 1822 accepted as Proceraea Ehlers, 1864
- Genus Anaplosyllis Chamberlin, 1919
- Genus Anguillosyllis Day, 1963
- Genus Anopllosylis Webster & Benedict, 1887
- Genus Anoplosyllis Claparède, 1868
- Genus Antolytides Malaquin, 1893
- Genus Antolytus Gervais & Beneden, 1859 accepted as Autolytus Grube, 1850
- Genus Aporosyllis Quatrefages, 1866 accepted as Syllis Savigny in Lamarck, 1818
- Genus Aporosyllis Quatrefages, 1865
- Genus Astreptosyllis Kudenov & Dorsey, 1982
- Genus Atelesyllis Pruvot, 1930 accepted as Odontosyllis Claparède, 1863
- Genus Autolytides Malaquin, 1893 accepted as Myrianida Milne Edwards, 1845
- Genus Autolytur accepted as Autolytus Grube, 1850
- Genus Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845
- Genus Autosyllis Imajima & Hartman, 1964 accepted as Virchowia Langerhans, 1879
- Genus Basidiosyllis San Martín, López & Aguado, 2009 accepted as Paraopisthosyllis Hartmann-Schröder, 1991
- Genus Bollandia Glasby, 1994 accepted as Bollandiella Glasby & Krell, 2009
- Genus Bollandiella Glasby & Krell, 2009
- Genus Brachiosyllis accepted as Branchiosyllis Ehlers, 1887
- Genus Brachysyllis Imajima & Hartman, 1964
- Genus Branchiosyllis Ehlers, 1887
- Genus Brania Quatrefages, 1866
- Genus Braniella Hartman, 1965 accepted as Anguillosyllis Day, 1963
- Genus Brevicirrosyllis San Martín, López & Aguado, 2009
- Genus Campesyllis Chamberlin, 1919
- Genus Chaetosyllis Malmgren, 1867 accepted as Syllis Savigny in Lamarck, 1818
- Genus Choetosyllis Malaquin, 1893
- Genus Chritida Quatrefages in Quatrefages (Vaillant), 1866
- Genus Cices Diaz-Castaneda & San Martín, 2001
- Genus Cicese Diaz-Castaneda & San Martin, 2001
- Genus Claparedia Quatrefages, 1866
- Genus Clavisyllis Knox, 1957
- Genus Crithida Gosse, 1855 accepted as Myrianida Milne Edwards, 1845
- Genus Cystonereis Kölliker, 1846 accepted as Exogone Örsted, 1845
- Genus Dentatisyllis Perkins, 1981
- Genus Desmosyllis Verrill, 1900 accepted as Eusyllis Malmgren, 1867
- Genus Dioplosyllis Gidholm, 1962
- Genus Diploceraea Grube, 1850 accepted as Myrianida Milne Edwards, 1845
- Genus Diplocerea Schmarda, 1861
- Genus Diploceroea Quatrefages in Quatrefages (Vaillant), 1866
- Genus Ehlersia Quatrefages, 1865 accepted as Syllis Savigny in Lamarck, 1818
- Genus Epigamia Nygren, 2004
- Genus Erinaceusyllis San Martín, 2005
- Genus Erseia Nygren, Sundkvist, Mikac & Pleijel, 2010
- Genus Eucerastes Ehlers, 1864
- Genus Eudontosyllis Knox, 1960
- Genus Eurisyllis Quatrefages in Quatrefages, 1866 accepted as Eurysyllis Ehlers, 1864
- Genus Eurymedusa Kinberg, 1866 accepted as Syllis Savigny in Lamarck, 1818
- Genus Eurysillis Quatrefages in Quatrefages (Vaillant), 1866 accepted as Eurysyllis Ehlers, 1864
- Genus Eurysillis Ehlers, 1864 accepted as Eurysyllis Ehlers, 1864
- Genus Eurysyllis Ehlers, 1864
- Genus Eusyllis Malmgren, 1867
- Genus Exagone Milne-Edwards, 1851 accepted as Exogone Örsted, 1845
- Genus Exagone Örsted, 1845 accepted as Exogone Örsted, 1845
- Genus Exogene Schultze, 1853 accepted as Exogone Örsted, 1845
- Genus Exogona Dujardin, 1851 accepted as Exogone Örsted, 1845
- Genus Exogona Örsted, 1845 accepted as Exogone Örsted, 1845
- Genus Exogone Örsted, 1845
- Genus Exogonella Hartman, 1961 accepted as Parexogone Mesnil & Caullery, 1918
- Genus Exogonita Hartman & Fauchald, 1971
- Genus Exogonoides Day, 1963
- Genus Exotokas Ehlers, 1864 accepted as Exogone Örsted, 1845
- Genus Fauvelia Gravier, 1900
- Genus Gattioa Verrill, 1874
- Genus Gattiola Johnston, 1865 accepted as Amblyosyllis Grube, 1857
- Genus Geminosyllis Imajima, 1966
- Genus Gnathosyllis Schmarda, 1861 accepted as Syllis Savigny in Lamarck, 1818
- Genus Gossia Quatrefages, 1866 accepted as Exogone Örsted, 1845
- Genus Grubea Quatrefages, 1865 accepted as Salvatoria McIntosh, 1885
- Genus Grubeosyllis Verrill, 1900 accepted as Salvatoria McIntosh, 1885
- Genus Guillermogonita Böggemann, 2009
- Genus Haplasyllis Saint-Joseph, 1886 accepted as Haplosyllis Langerhans, 1879
- Genus Haplosyllides Augener, 1922
- Genus Haplosyllis Langerhans, 1879
- Genus Hemisyllis Verrill, 1900
- Genus Hesiosyllis Wesenberg-Lund, 1950 accepted as Pionosyllis Malmgren, 1867
- Genus Hesperalia Chamberlin, 1919 accepted as Odontosyllis Claparède, 1863
- Genus Heterosyllis Claparède, 1863
- Genus Imajimaea Nygren, 2004
- Genus Inermosyllis San Martín, 2003
- Genus Ioda Viguier, 1885 accepted as Ioida Johnston, 1840
- Genus Ioida Johnston, 1840 accepted as Syllis Savigny in Lamarck, 1818
- Genus Irmula Ehlers, 1913
- Genus Isosyllis Ehlers, 1864 accepted as Syllis Savigny in Lamarck, 1818
- Genus Karroonsyllis San Martín & López, 2003
- Genus Lamellisyllis Day, 1960
- Genus Langerhansia Czerniavsky, 1881 accepted as Syllis Savigny in Lamarck, 1818
- Genus Laomedora Kinberg, 1866
- Genus Lapithas Kinberg, 1866
- Genus Levidorum Hartman, 1967
- Genus Lophosyllis Sars, 1867
- Genus Lycastis Audouin & Milne-Edwards, 1833 accepted as Syllis Savigny in Lamarck, 1818
- Genus Lycastis Savigny, 1822 accepted as Syllis Savigny in Lamarck, 1818
- Genus Megasyllis San Martín, Hutchings & Aguado, 2008
- Genus Microsyllis Claparède, 1863 accepted as Exogone Örsted, 1845
- Genus Mikrosyllis Langerhans, 1879
- Genus Miscellania Martin, Alós & Sardá, 1990
- Genus Monocerina Costa, 1861
- Genus Murrindisyllis San Martín, Aguado & Murray, 2007
- Genus Myriadine Frey & Leuckart, 1847 accepted as Myrianida Milne Edwards, 1845
- Genus Myrianida Milne Edwards, 1845
- Genus Neopetitia San Martín, 2003
- Genus Nercisyllis Lamarck, 1845
- Genus Nereidosyllis Agassiz, 1846
- Genus Nereisillis Nardo, 1847
- Genus Nereisylla Chenu, 1855-58
- Genus Nereisyllis Blainville, 1828 accepted as Proceraea Ehlers, 1864
- Genus Nerersylle Gay, 1849
- Genus Nicotia Costa, 1864 accepted as Amblyosyllis Grube, 1857
- Genus Nooralia San Martín, 2002
- Genus Nuchalosyllis Rullier & Amoureux, 1979
- Genus Nudisyllis Knox & Cameron, 1970
- Genus Odontoautolytus Hartmann-Schröder & Hartmann, 1979 accepted as Odontosyllis Claparède, 1863
- Genus Odontosyllis Claparède, 1863
- Genus Odotosyllis accepted as Odontosyllis Claparède, 1863
- Genus Oophylax Ehlers, 1864 accepted as Exogone Örsted, 1845
- Genus Ophisthodonta Langerhans, 1879 accepted as Opisthodonta Langerhans, 1879
- Genus Opisthodonta Langerhans, 1879
- Genus Opisthosyllis Langerhans, 1879
- Genus Pachyprocerastea Nygren, 2004
- Genus Paedophylax Claparède, 1868 accepted as Exogone Örsted, 1845
- Genus Paedophyllax Fage, 1906
- Genus Paedophyllax Claparède, 1868 accepted as Exogone Örsted, 1845
- Genus Pagenstecheria Quatrefages, 1866 accepted as Syllis Savigny in Lamarck, 1818
- Genus Palposyllis Hartmann-Schröder, 1977
- Genus Paraehlersia San Martín, 2003
- Genus Parahaplosyllis Hartmann-Schröder, 1990
- Genus Paraopisthosyllis Hartmann-Schröder, 1991
- Genus Parapionosyllis Fauvel, 1923
- Genus Paraproceraea Nygren, 2004
- Genus Paraprocerastea San Martín & Alós, 1989
- Genus Parapterosyllis Hartmann-Schröder, 1960
- Genus Parasitosyllis Potts, 1912
- Genus Parasphaerosyllis Monro, 1937
- Genus Paratyposyllis Hartmann-Schröder, 1962
- Genus Parautolytus Ehlers, 1900
- Genus Parexogone Mesnil & Caullery, 1918
- Genus Pedophylax Verrill, 1879
- Genus Periboea Kinberg, 1866
- Genus Perkinsyllis San Martín, López & Aguado, 2009
- Genus Petitia Siewing, 1956 accepted as Neopetitia San Martín, 2003
- Genus Petitia Deboutteville, Gerlach & Siewing, 1955 accepted as Neopetitia San Martín, 2003
- Genus Petrosyllis
- Genus Pharyngeovalvata Day, 1951 accepted as Odontosyllis Claparède, 1863
- Genus Photocaris Quatrefages, 1850
- Genus Photocharis Ehrenberg, 1835
- Genus Phyllosyllis Ehlers, 1897
- Genus Pionisyllis Pierantoni, 1905 accepted as Pionosyllis Malmgren, 1867
- Genus Pionosyllis Malmgren, 1867
- Genus Plakosyllis Hartmann-Schröder, 1956
- Genus Planicirrata Nygren, 2004
- Genus Platysyllis Grube, 1878
- Genus Podenereis Blainville, 1818 accepted as Myrianida Milne Edwards, 1845
- Genus Podonereis Oken, 1818 accepted as Myrianida Milne Edwards, 1845
- Genus Podonereis Blainville, 1818 accepted as Myrianida Milne Edwards, 1845
- Genus Poedophylax Claparède, 1868
- Genus Polybostrichus Örsted, 1843 accepted as Proceraea Ehlers, 1864
- Genus Polybostricus Quatrefages, 1865
- Genus Polybostrychus Agassiz, 1846
- Genus Polymastus Claparède, 1864 accepted as Eurysyllis Ehlers, 1864
- Genus Polynice Savigny, 1822 accepted as Proceraea Ehlers, 1864
- Genus Procera [auct. misspelling] accepted as Proceraea Ehlers, 1864
- Genus Proceraea Ehlers, 1864
- Genus Procerastea Langerhans, 1884
- Genus Procerea Quatrefages in Quatrefages (Vaillant), 1866 accepted as Proceraea Ehlers, 1864
- Genus Procereastea Fage, 1906 accepted as Procerastea Langerhans, 1884
- Genus Proceroea Saint-Joseph, 1885 accepted as Proceraea Ehlers, 1864
- Genus Procome Ehlers, 1864 accepted as Odontosyllis Claparède, 1863
- Genus Pronosyllis Langerhans, 1879 accepted as Pionosyllis Malmgren, 1867
- Genus Prosphaerosyllis San Martín, 1984
- Genus Protogrubea Czerniavsky, 1881 accepted as Salvatoria McIntosh, 1885
- Genus Psammosyllis Westheide, 1990
- Genus Pseudobrania San Martín, 1984 accepted as Salvatoria McIntosh, 1885
- Genus Pseudosyllides Augener, 1927 accepted as Inermosyllis San Martín, 2003
- Genus Pseudosyllis Grube, 1863 accepted as Trypanosyllis Claparède, 1864
- Genus Pterautolytus Ehlers, 1907 accepted as Proceraea Ehlers, 1864
- Genus Pteroautolytus [auctt. misspelling] accepted as Pterautolytus Ehlers, 1907
- Genus Pterosyllis Claparède, 1863 accepted as Amblyosyllis Grube, 1857
- Genus Ramisyllis Glasby, Schroeder & Aguado, 2012
- Genus Reductotyposyllis Hartmann-Schröder, 1974 accepted as Syllis Savigny in Lamarck, 1818
- Genus Regulatus Imajima, 1966 accepted as Proceraea Ehlers, 1864
- Genus Rhopalosyllis Augener, 1913
- Genus Sacconereis J. Müller, 1853 accepted as Myrianida Milne Edwards, 1845
- Genus Salvatoria McIntosh, 1885
- Genus Schmardia Quatrefages, 1866 accepted as Exogone Örsted, 1845
- Genus Scolopendra Slabber, 1781 accepted as Myrianida Milne Edwards, 1845
- Genus Scolopendra Cordiner, 1785 accepted as Myrianida Milne Edwards, 1845
- Genus Scyllis Johnston, 1845
- Genus Sinpalposyllis Hartmann-Schröder, 1983 accepted as Odontosyllis Claparède, 1863
- Genus Spaerosyllis accepted as Sphaerosyllis Claparède, 1863
- Genus Spermosyllis Claparède, 1864 accepted as Exogone Örsted, 1845
- Genus Sphaerophyllis Saint-Joseph, 1886 accepted as Sphaerosyllis Claparède, 1863
- Genus Sphaerosyllis Claparède, 1863
- Genus Sphoerosyllis Quatrefages in Quatrefages (Vaillant), 1866 accepted as Sphaerosyllis Claparède, 1863
- Genus Spionsyllis Hempelmann in Kükenthal & Krumbach, 1931 accepted as Pionosyllis Malmgren, 1867
- Genus Stephanosyllis Claparède, 1864 accepted as Proceraea Ehlers, 1864
- Genus Streptodonta San Martín & Hutchings, 2006
- Genus Streptospinigera Kudenov, 1983
- Genus Streptosyllis Webster & Benedict, 1884
- Genus Syllia Quatrefages in Quatrefages (Vaillant), 1866
- Genus Syllia Quatrefages, 1865
- Genus Syllides Örsted, 1845
- Genus Sylline Grube, 1860 accepted as Myrianida Milne Edwards, 1845
- Genus Sylline Claparède, 1864 accepted as Exogone Örsted, 1845
- Genus Syllis Savigny in Lamarck, 1818
- Genus Syllos Michel, 1897
- Genus Synmerosyllis San Martín, López & Aguado, 2009
- Genus Synsyllis Verrill, 1900
- Genus Tetraglena Quatrefages, 1866 accepted as Trypanosyllis Claparède, 1864
- Genus Tetraglene Grube, 1863 accepted as Trypanosyllis Claparède, 1864
- Genus Tetrapalpia San Martín, Hutchings & Aguado, 2008
- Genus Thoe Kinberg, 1866 accepted as Syllis Savigny in Lamarck, 1818
- Species Thoe fusiformis Kinberg, 1866
- Genus Thylaciphorus Quatrefages, 1866 accepted as Amblyosyllis Grube, 1857
- Genus Thylacophorus Malaquin, 1893
- Genus Trichosyllis Schmarda, 1861 accepted as Syllis Savigny in Lamarck, 1818
- Genus Trypanedenta Imajima & Hartman, 1964
- Genus Trypanobia Imajima & Hartman, 1964
- Genus Trypanospina Álvarez-Campos, Taboada, San Martín, Leiva & Riesgo, 2018
- Genus Trypanosyllis Claparède, 1864
- Genus Typanosyllis Verrill, 1900 accepted as Trypanosyllis Claparède, 1864
- Genus Typosillis Marenzeller, 1890 accepted as Typosyllis Langerhans, 1879
- Genus Typosyllis Langerhans, 1879 accepted as Syllis Savigny in Lamarck, 1818
- Genus Typosyylis accepted as Typosyllis Langerhans, 1879
- Genus Umbellisyllis M. Sars, 1869
- Genus Umbellisyllys M. Sars, 1869 accepted as Umbellisyllis M. Sars, 1869
- Genus Virchowia Langerhans, 1879
- Genus Westheidesyllis San Martín, López & Aguado, 2009
- Genus Xenosyllides Perejaslavzeva, 1891
- Genus Xenosyllis Marion & Bobretzky, 1875
- 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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