Between brackets is the number of accepted species
1 Click on "-" to collapse/hide all child taxa
2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
4 Click on "+" to expand/show all child taxa
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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
- Family Didemnidae Giard, 1872
- Family Euherdmaniidae Ritter, 1904
- Family Placentelidae Kott, 1992
- Family Polycitoridae Michaelsen, 1904
- Genus Archdistoma accepted as Archidistoma Garstang, 1891
- Genus Archidistoma Garstang, 1891
- Genus Brevicollus Kott, 1990
- Genus Cavellina Maitland, 1897 accepted as Clavelina Savigny, 1816
- Genus Claphelina Haeckel, 1896 accepted as Clavelina Savigny, 1816
- Genus Clavalina Burmeister, 1837 accepted as Clavelina Savigny, 1816
- Genus Clavclina Sharp, 1911 accepted as Clavelina Savigny, 1816
- Genus Clavella Sluiter, 1904 accepted as Clavelina Savigny, 1816
- Genus Clavellina Savigny, 1816 accepted as Clavelina Savigny, 1816
- Genus Clavilina Lefevre, 1897 accepted as Clavelina Savigny, 1816
- Genus Cystodites Drasche, 1884 accepted as Cystodytes Drasche, 1884
- Genus Cystodytes Drasche, 1884
- Genus Dimorpha Pérès, 1948
- Genus Distalium Verrill, 1900 accepted as Distaplia Della Valle, 1881
- Genus Distalpa Morgan, 1891 accepted as Distaplia Della Valle, 1881
- Genus Distalpia Bochenek, 1905 accepted as Distaplia Della Valle, 1881
- Genus Distapelia Clark, 1906 accepted as Distaplia Della Valle, 1881
- Genus Distaphia Bjerkan, 1908 accepted as Distaplia Della Valle, 1881
- Genus Distoma Savigny, 1816 accepted as Eudistoma Caullery, 1909
- Genus Distomum Savigny, 1816 accepted as Eudistoma Caullery, 1909
- Genus Encaelium Blainville, 1819 accepted as Eucoelium Savigny, 1816
- Genus Encoelia Voigt in Cuvier, 1834 accepted as Eucoelium Savigny, 1816
- Genus Encoelium della Chiaje, 1828 accepted as Eucoelium Savigny, 1816
- Genus Eucaelium Cuvier, 1817 accepted as Eucoelium Savigny, 1816
- Genus Eucalium Alder & Hancock, 1912 accepted as Eucoelium Savigny, 1816
- Genus Eucelium Goldfuss, 1818 accepted as Eucoelium Savigny, 1816
- Genus Euclaeium Johnston, 1850 accepted as Eucoelium Savigny, 1816
- Genus Eucoelinus Hesse, 1865 accepted as Eucoelium Savigny, 1816
- Genus Eucoelium Savigny, 1816
- Genus Eucoelum Woodward in Cassell, 1883 accepted as Eucoelium Savigny, 1816
- Genus Eucollium Oken, 1829 accepted as Eucoelium Savigny, 1816
- Genus Eudistoma Caullery, 1909
- Genus Eudistonia Michaelsen, 1915 accepted as Eudistoma Caullery, 1909
- Genus Euscelium Guérin-Méneville, 1844 accepted as Eucoelium Savigny, 1816
- Genus Exostoma Kott, 1990
- Genus Lavelina Kirkpatrick, 1905 accepted as Clavelina Savigny, 1816
- Genus Millarus C. Monniot & F. Monniot, 1988
- Genus Paessleria Michaelsen, 1909 accepted as Eudistoma Caullery, 1909
- Genus Paradistoma Caullery, 1909 accepted as Polycitor Renier, 1804
- Genus Polycitor Renier, 1804
- Genus Polycitorella Michaelsen, 1924
- Genus Rhombifera Pérès, 1956
- Genus Salix Kott, 2005
- Genus Sigillima Savigny, 1816 accepted as Sigillina Savigny, 1816
- Species Sigillima moebiusi (Hertmeyer, 1905)
- Genus Tetrazona Michaelsen, 1930 accepted as Polycitor Renier, 1804
- Family Polyclinidae Milne-Edwards, 1841
- Family Vitrumidae Kott, 2009
- Order Ascidiacea (awaiting allocation)
- Order Cassianomorpha †
- Order Enterogona
- Order Khmeriamorpha †
- Order Phlebobranchia
- 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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