Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Subphylum Cephalochordata
- Subphylum Tunicata accepted as Urochordata
- Subphylum Urochordata
- Class Appendicularia
- Class Ascidiacea
- Order Aplousobranchia
- Order Ascidiacea (awaiting allocation)
- Order Cassianomorpha †
- Order Enterogona
- Order Khmeriamorpha †
- Order Phlebobranchia
- Family Agnesiidae Huntsman, 1912 accepted as Agneziidae Monniot & Monniot, 1991
- Family Agneziidae Monniot & Monniot, 1991
- Family Ascidiidae Herdman, 1882
- Family Ciallusiidae Huus, 1936 accepted as Agneziidae Monniot & Monniot, 1991
- Family Cionidae Lahille, 1887
- Family Corellidae Lahille, 1888
- Genus Abyssascidia Herdman, 1880
- Genus Agnesiopsis C. Monniot, 1969 accepted as Corynascidia Herdman, 1882
- Genus Cheliosoma Redikorzev in Derjugin, 1910 accepted as Chelyosoma Broderip & Sowerby, 1830
- Genus Chelisoma Swainson, 1840 accepted as Chelyosoma Broderip & Sowerby, 1830
- Genus Chelyosoma Broderip & Sowerby, 1830
- Genus Chelyozoma Redikorzev, 1911 accepted as Chelyosoma Broderip & Sowerby, 1830
- Genus Chelysoma Gravenhorst, 1843 accepted as Chelyosoma Broderip & Sowerby, 1830
- Genus Chevreulia Schmarda, 1872
- Genus Chevreulius Lacaze-Duthiers, 1865 accepted as Rhodosoma Ehrenberg, 1828
- Genus Chorynascidia Ritter, 1912 accepted as Corynascidia Herdman, 1882
- Genus Chrevreulius Rolleston, 1870
- Genus Clatripes F. Monniot & C. Monniot, 1976
- Genus Corella Alder & Hancock, 1870
- Genus Corellascidia Hartmeyer, 1900 accepted as Rhodosoma Ehrenberg, 1828
- Genus Corelloides Oka, 1926
- Genus Corellopsis Hartmeyer in Roemer & Schaudinn, 1903
- Genus Corinascidia Agassiz, 1892 accepted as Corynascidia Herdman, 1882
- Genus Correllopsis Schepotieff, 1911 accepted as Corellopsis Hartmeyer in Roemer & Schaudinn, 1903
- Genus Coryanascidia Ritter, 1907 accepted as Corynascidia Herdman, 1882
- Genus Corynascidia Herdman, 1882
- Genus Dextrogaster F. Monniot, 1962
- Genus Mysterascidia C. Monniot & F. Monniot, 1982
- Genus Pera Macdonald, 1862
- Genus Peroides Macdonald, 1864 accepted as Rhodosoma Ehrenberg, 1828
- Genus Rhodosema Paetel, 1875 accepted as Rhodosoma Ehrenberg, 1828
- Genus Rhodosoma Ehrenberg, 1828
- Genus Schizascus Stimpson, 1855 accepted as Rhodosoma Ehrenberg, 1828
- Genus Xenobranchion Ärnbäck-Christie-Linde, 1950
- Species Xenobranchion insigne Ärnbäck, 1950
- Species Xenobranchion tenue F. & C. Monniot, 1976
- Family Diazonidae Seeliger, 1906
- Family Hypobythiidae
- Family Octacnemidae
- Family Perophoridae Giard, 1872
- Order Pleurogona
- Order Stolidobranchia
- Genus Gongylis N. Hoffmann, 1970 †
- Genus Perforocalcinella Bóna, 1964 †
- Genus Tansinius M.G. Filipescu & E. Hanganu, 1960 †
- Class Thaliacea
- Class Urochordata (awaiting allocation)
- Genus Chaonites Passy, 1832 † accepted as Choanites Mantell, 1822 †
- Genus Choanites Mantell, 1822 †
- Genus Megasiphon Nanglu, Lerosey-Aubril, Weaver & Ortega-Hernández, 2023 †
- Subphylum Vertebrata
- Class Chordata (awaiting allocation)
- Class Eotetrapodiformes incertae sedis
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia 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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