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
- Phylum Cnidaria
- Subphylum Anthozoa
- Class Hexacorallia
- Order Actiniaria
- Order Antipatharia
- Order Ceriantharia
- Order Corallimorpharia
- Order Hexanthiniaria †
- Order Kilbuchophyllida †
- Order Ptychodactiaria accepted as Actiniaria
- Order Scleractinia
- Family Acroporidae Verrill, 1902
- Family Acrosmiliidae †
- Family Actinacididae Vaughan & Wells, 1943 †
- Family Actinastreidae Alloiteau, 1952 †
- Family Agariciidae Gray, 1847
- Family Agatheliidae Beauvais & Beauvais, 1975 †
- Family Agathiphylliidae †
- Family Alpinophylliidae Roniewicz, 1989 †
- Family Amphiastraeidae Ogilvie, 1897 †
- Family Amphiastreidae Ogilvie, 1896 † accepted as Amphiastraeidae Ogilvie, 1897 †
- Family Andemantastraeidae †
- Family Anthemiphylliidae Vaughan, 1907
- Family Astraeomorphidae Frech, 1890 †
- Family Astrangiidae
- Family Astraraeidae Beauvais, 1982 †
- Family Astrocoeniidae Koby, 1890
- Family Aulastraeoporidae Alloiteau, 1957 †
- Family Axosmiliidae Geyer, 1955 †
- Family Brachyphylliidae †
- Family Calamophylliidae †
- Family Carolastaeidae †
- Family Carolastraeidae Eliasova, 1976 †
- Family Caryophyllidae
- Family Caryophylliidae Dana, 1846
- Family Cladophylliidae †
- Family Columastraeidae Alloiteau, 1952 †
- Family Conophyllidae † accepted as Conophylliidae †
- Family Conophylliidae †
- Family Coryphylliidae †
- Family Coscinaraeidae Benzoni, Arrigoni, Stefani & Stolarski, 2012
- Family Cuifastraeidae Mel'nikova, 1983 †
- Family Curtoseriidae Melnikova, 1996 †
- Family Cyathophoridae Vaughan & Wells, 1943 †
- Family Cyclastraeidae Alloiteau, 1952 †
- Family Cyclolitidae d'Orbigny, 1851 †
- Family Cyclophylliidae †
- Family Cyclophyllopsiidae †
- Family Deltocyathidae Kitahara, Cairns, Stolarski & Miller, 2012
- Family Dendrogyridae †
- Family Dendrophyllidae accepted as Dendrophylliidae Gray, 1847
- Family Dendrophylliidae Gray, 1847
- Family Dermosmiliidae Koby, 1889 †
- Family Diploastreidae Chevalier & Beauvais, 1987
- Family Distichophyllidae Cuif, 1976 †
- Family Donacosmilidae † accepted as Donacosmiliidae Krasnov, 1970 †
- Family Donacosmiliidae Krasnov, 1970 †
- Family Eckastraeidae Morycowa in Morycowa & Szulc, 2006 †
- Family Elasmocoeniidae Duncan, 1884 †
- Family Ellipsosmiliidae †
- Family Euheliidae †
- Family Euphyllidae Veron, 2000
- Family Euphylliidae Alloiteau, 1952
- Family Eusmilidae
- Family Faviidae Gregory, 1900
- Family Felixaraeidae Beauvais, 1982 †
- Family Flabellidae Bourne, 1905
- Family Fungiacyathidae Chevalier, 1987
- Family Fungiidae Dana, 1846
- Family Funginellidae †
- Family Gablonzeriidae †
- Family Gardinariidae
- Family Gardineriidae Stolarski, 1996
- Family Gigantostyliidae †
- Family Guembelastraeidae Melnikova, 1984 † accepted as Tropiastraeidae Cuif, 1977 †
- Family Gumbelastraeidae † accepted as Guembelastraeidae Melnikova, 1984 †
- Family Guyniidae Hickson, 1910
- Family Haplaraeidae Vaughan & Wells, 1943 †
- Family Heliastraeidae †
- Family Heterocoeniidae Oppenheim, 1930 †
- Family Hexapetalidae Eliášová, 1976 †
- Family Intersmiliidae Melnikova & Roniewicz, 1976 †
- Family Isastreidae Alloiteau, 1952 † accepted as Thecosmiliidae Duncan, 1884 †
- Family Kobyastraeidae †
- Family Latomeandridae Alloiteau, 1952 †
- Family Lithophylliidae
- Family Lobophylliidae Fukami, Budd & Knowlton, 2012
- Family Madreporidae Ehrenberg, 1834
- Family Margarophylliidae Cuif, 1977 †
- Family Meandriidae †
- Family Meandrinidae Gray, 1847
- Family Merulinidae Verrill, 1866
- Family Micrabaciidae Vaughn, 1905
- Family Microsolenidae Koby, 1890 †
- Family Misistellidae †
- Family Montastraeidae Yabe & Sugiyama, 1941
- Family Montlivaltiidae Dietrich, 1926 † accepted as Thecosmiliidae Duncan, 1884 †
- Family Mussidae Ortmann, 1890
- Family Negoporitidae Eliášová, 1995 †
- Family Oculinidae Gray, 1847
- Genus Archohelia Vaughan, 1919 accepted as Petrophyllia Conrad, 1855
- Genus Astrelia d'Orbigny, 1852 †
- Genus Astrhelia Milne-Edwards & Haime, 1849 †
- Genus Astrohelia Haime & Milne-Edwards in Milne-Edwards, 1857 †
- Genus Bantamia Yabe & Eguchi, 1943 †
- Genus Bathelia Moseley, 1881
- Genus Caenopsammia Milne-Edwards & Haime, 1848
- Genus Coelohelia Vaughan, 1900 † accepted as Oculina Lamarck, 1816
- Genus Cyathelia Milne Edwards & Haime, 1849
- Genus Cyathohelia Carus & Gerstaecker, 1863 accepted as Cyathelia Milne Edwards & Haime, 1849
- Genus Cyathohelia Milne Edwards & Haime, 1849 accepted as Cyathelia Milne Edwards & Haime, 1849
- Genus Dentipora de Blainville, 1830 accepted as Oculina Lamarck, 1816
- Genus Diblasus Lonsdale in Dixon, 1850 †
- Genus Diplhelia Milne-Edwards & Haime, 1850
- Genus Haplohelia Reuss, 1865 †
- Genus Lophohelia Milne Edwards & Haime, 1857 accepted as Lophelia Milne Edwards & Haime, 1849
- Genus Oculina Lamarck, 1816
- Genus Palaeohelia Alloiteau, 1958 †
- Genus Petrophyllia Conrad, 1855
- Genus Schizoculina Wells, 1937
- Genus Schizooculina Wells, 1937 accepted as Oculina Lamarck, 1816
- Genus Sclerhelia Milne Edwards & Haime, 1850
- Genus Sclerohelia Milne-Edwards, 1857 accepted as Sclerhelia Milne Edwards & Haime, 1850
- Genus Stylopsammia Oppenheim, 1930 † accepted as Madracis Milne Edwards & Haime, 1849
- Genus Trymhelia Milne-Edwards & Haime, 1849 accepted as Oculina Lamarck, 1816
- Genus Trymohelia Haime & Milne-Edwards in Milne-Edwards, 1857 accepted as Oculina Lamarck, 1816
- Family Opisthophyllidae †
- Family Oppelismiliidae Melnikova & Roniewicz, 2017 †
- Family Orbicellidae Vaughan
- Family Pachyphyllidae †
- Family Pachyphylliidae Beauvais, 1982 †
- Family Pachythecalidae Cuif, 1975 †
- Family Pamiroseriidae Melnikova, 1984 †
- Family Parasmiliidae Alloiteau, 1952 †
- Family Parepismiliidae Melnikova & Roniewicz, 2017 †
- Family Pectiniidae Vaughan & Wells, 1943 accepted as Merulinidae Verrill, 1866
- Family Phyllosmiliidae Felix, 1903 †
- Family Placocoeniidae Alloiteau, 1952 †
- Family Placophylliidae d'Orbigny, 1849 †
- Family Placosmiliidae Alloiteau, 1952 †
- Family Pocilloporidae Gray, 1842
- Family Polystylidiidae Lathuilière, Charbonnier & Pacaud, 2017 †
- Family Poritidae Gray, 1842
- Family Procyclolitidae Vaughan & Wells, 1943 †
- Family Protoheterastraeidae Cuif, 1977 †
- Family Psammocoridae Chevalier & Beauvais, 1987
- Family Rayasmiliidae Löser, 2022 †
- Family Reimaniphylliidae Melnikova, 1975 †
- Family Rhipidastraeidae †
- Family Rhipidogyridae Koby, 1904 †
- Family Rhizangiidae d'Orbigny, 1851
- Family Schizocyathidae Stolarski, 2000
- Family Scleractinia (awaiting allocation)
- Family Scleractinia incertae sedis
- Family Seriatoporidae accepted as Pocilloporidae Gray, 1842
- Family Siderasteridae
- Family Siderastraeidae accepted as Siderastreidae Vaughan & Wells, 1943
- Family Siderastreidae Vaughan & Wells, 1943
- Family Smilostyliidae †
- Family Smilotrochiidae †
- Family Solenocoeniidae Roniewicz, 2008 †
- Family Stenocyathidae Stolarski, 2000
- Family Stephanocyathidae Vaga, Cairns & Kitahara, 2024
- Family Stylinidae d'Orbigny, 1851 †
- Family Stylophoridae accepted as Pocilloporidae Gray, 1842
- Family Stylophyllidae Volz, 1896 †
- Family Sylviellidae Eliášová, 2015 †
- Family Synastraeidae Alloiteau, 1952 †
- Family Synastreidae accepted as Poritidae Gray, 1842
- Family Thamnasteriidae Vaughan & Wells, 1943
- Family Thecosmiliidae Duncan, 1884 †
- Family Trachyphylliidae Verrill, 1901
- Family Trochoidomeandridae Turnsek, 1981 †
- Family Trochosmiliidae
- Family Tropiastraeidae Cuif, 1977 †
- Family Tropidastraeidae † accepted as Tropiastraeidae Cuif, 1977 †
- Family Turbinoliidae Milne-Edwards & Haime, 1848
- Family Volzeiidae Melnikova, 1974 †
- Family Zardinophyllidae Montanaro-Gallitelli, 1975 †
- Family Zardinophylliidae † accepted as Zardinophyllidae Montanaro-Gallitelli, 1975 †
- Order Zoantharia
- Order Zoanthinaria accepted as Zoantharia
- Genus Eolympia Han, Yao, Kubota, Uchida & Yasui in Han et al., 2010 †
- Class Octocorallia
- Order Alcyonacea accepted as Octocorallia
- Order Anthozoa (awaiting allocation)
- Order Anthozoa incertae sedis
- Order Auloporida †
- Order Cambroctoconida †
- Order Coenothecalia accepted as Scleralcyonacea
- Order Cothoniida †
- Order Cystiphyllida †
- Order Favositida †
- Order Gastraxonacea accepted as Octocorallia
- Order Heliolitida †
- Order Helioporacea accepted as Scleralcyonacea
- Order Heterocorallia †
- Order Hexacorallia (awaiting allocation)
- Order Lichenariida †
- Order Lyndaphylonacea †
- Order Numidiaphyllida †
- Order Proporida †
- Order Protoalcyonaria accepted as Malacalcyonacea
- Order Rugosa †
- Order Sarcinulida †
- Order Scleromorpharia †
- Order Stauriida †
- Order Tabulaconida †
- Order Tabulata †
- Order Telestacea accepted as Malacalcyonacea
- Order Trachypsammiacea †
- Family Pseudocladochonidae accepted as Octocorallia
- Subphylum Medusozoa incertae sedis
- Subphylum Myxozoa
- Class Cnidaria (awaiting allocation)
- Class Cubozoa
- Class Cyclozoa
- Class Hydroconozoa †
- Class Hydrozoa
- Class Protomedusae †
- Class Scyphozoa
- Class Staurozoa
- Order Melanoskleritoitidea †
- Family Hiemaloriidae Fedonkin, 1985 †
- Genus Euzebiola Sommer, 1954 † accepted as Sphenothallus Hall, 1847 †
- Genus Hallotheca Bouček, 1936 † accepted as Sphenothallus Hall, 1847 †
- Genus Pennalina Cope, 2005 †
- Genus Pywackia Landing in Landing, English & Keppie, 2010 †
- Genus Rhizostromella Parona in Parona, Crema & Prever, 1909 †
- Genus Sphenothallus Hall, 1847 †
- 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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