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
- Order Aciculata
- Order Amphinomida
- Order Amphinomorpha
- Order Athecanephria
- Order Canalipalpata
- Order Capitellida
- Family Arenicolidae Johnston, 1835
- Family Bogueidae Hartman & Fauchald, 1971 accepted as Maldanidae Malmgren, 1867
- Family Capitellida (awaiting allocation)
- Family Capitellidae Grube, 1862
- Genus Abyssocapitella Buzhinskaja & Smirnov, 2000
- Genus Amastigos Piltz, 1977
- Genus Ancistia Schmarda, 1877
- Genus Ancistra Pernier, 1897
- Genus Ancistria Quatrefages, 1866 accepted as Heteromastus Eisig, 1887
- Genus Ancystria Czerniavsky, 1881
- Genus Anotomastus Hartman, 1947
- Genus Arenia Quatrefages, 1866 accepted as Notomastus M. Sars, 1851
- Genus Areniella Verrill, 1874 accepted as Heteromastus Eisig, 1887
- Genus Baldia Garwood & Bamber, 1988
- Genus Barantolla Southern, 1921
- Genus Branchiocapitella Fauvel, 1932 accepted as Capitella Blainville, 1828
- Genus Branchoscolex Schmarda, 1861 accepted as Dasybranchus Grube, 1850
- Genus Bucherta Rullier, 1965 accepted as Dasybranchus Grube, 1850
- Genus Capitata Hartman, 1947
- Genus Capitella Blainville, 1828
- Genus Capitellethus Chamberlin, 1919
- Genus Capitellides Mesnil, 1897 accepted as Capitella Blainville, 1828
- Genus Capitellides Ehlers, 1907 accepted as Capitellethus Chamberlin, 1919
- Genus Capitita Hartman, 1947
- Genus Capitobranchus Day, 1962
- Genus Capitomastus Eisig, 1887 accepted as Capitella Blainville, 1828
- Genus Clistomastus Eisig, 1887 accepted as Notomastus M. Sars, 1851
- Genus Dasybranchethus Monro, 1931
- Genus Dasybranchetus Monro, 1931
- Genus Dasybranchus Grube, 1850
- Genus Dasymallus Grube, 1846 accepted as Dasybranchus Grube, 1850
- Species Dasymallus caducus Grube, 1846 accepted as Dasybranchus caducus (Grube, 1846)
- Genus Decamastus Hartman, 1963
- Genus Dodecamastus Blake in Blake, Hilbig & Scott, 2000
- Genus Dodecaseta McCammon & Stull, 1978
- Genus Eisigella Gravier, 1901
- Genus Eunotomastus McIntosh, 1885
- Genus Heteromastides Augener, 1914
- Genus Heteromastus McIntosh, 1885
- Genus Heteromastus Eisig, 1887
- Genus Isomastus Gravier, 1911 accepted as Capitella Blainville, 1828
- Genus Leiocapitella Hartman, 1947
- Genus Leiocapitellides Hartmann-Schröder, 1960
- Genus Leiochrides Augener, 1914
- Genus Leiochrus Ehlers, 1908
- Genus Lombricus Vérany, 1846
- Genus Lumbricomastus Thomassin, 1970
- Genus Lumbriconais Örsted, 1842
- Genus Mastobranchus Eisig, 1887
- Genus Matla Stephenson, 1908 accepted as Capitella Blainville, 1828
- Genus Mediomastus Hartman, 1944
- Genus Neoheteromastus Hartman, 1960
- Genus Neomediomastus Hartman, 1969
- Genus Neonotomastus Fauchald, 1972
- Genus Neopseudocapitella Rullier & Amoureux, 1979
- Genus Nonatus Amaral, 1980
- Genus Notamastus Saint-Joseph, 1898 accepted as Notomastus M. Sars, 1851
- Genus Notodasus Fauchald, 1972
- Genus Notomastus M. Sars, 1851
- Genus Notosmatus Panceri, 1875 accepted as Notomastus M. Sars, 1851
- Genus Octocapitella Brown, 1987
- Genus Paracapitella Kirkegaard, 1983
- Genus Paracapitella Carrasco & Gallardo, 1987
- Genus Paraleiocapitella Thomassin, 1970 accepted as Notomastus M. Sars, 1851
- Genus Paraleiochrides Zhang & Sun, 1997
- Genus Parheteromastides Hartmann-Schröder, 1962
- Genus Parheteromastus Monro, 1937
- Genus Peresiella Harmelin, 1968
- Genus Polymastigos Green, 2002
- Genus Promastobranchus Gallardo, 1968
- Genus Protomastobranchus [auct.] accepted as Promastobranchus Gallardo, 1968
- Genus Pseudocapitella Fauvel, 1913
- Genus Pseudoleiocapitella Harmelin, 1964
- Genus Pseudomastus Capaccioni-Azzati & Martin, 1992
- Genus Pseudonotomastus Warren & Parker, 1994
- Genus Pulliella Fauvel, 1929 accepted as Scyphoproctus Gravier, 1904
- Genus Rashgua Wesenberg-Lund, 1949
- Genus Saenuris Grube, 1860
- Genus Sandanis Kinberg, 1866
- Genus Scyphoproctus Gravier, 1904
- Genus Tremastomastus Chamberlin, 1919
- Genus Tremomastus Eisig, 1887
- Genus Undecimastus Amoureux, 1983
- Genus Valla Johnston, 1865 accepted as Capitella Blainville, 1828
- Family Maldanidae Malmgren, 1867
- Order Chaetopterida
- Order Cirratulida
- Order Cossurida
- Order Ctenodrilida
- Order Dinophilida
- Order Errantida †
- Order Eunicemorpha
- Order Eunicida
- Order Flabelligerida
- Order Magelonida
- Order Myzostomida
- Order Nerillida
- Order Opheliida
- Order Orbiniida
- Order Oweniida
- Order Phyllodocemorpha
- Order Phyllodocida
- 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 †
- 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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