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
- Class Octocorallia
- Order Gorgonacea accepted as Octocorallia
- Order Malacalcyonacea
- Order Pennatulacea accepted as Scleralcyonacea
- Order Scleralcyonacea
- Family Ainigmaptilidae Carlgren, 1943 accepted as Primnoidae Gray, 1857
- Family Anthoptilidae Kölliker, 1880
- Family Aulopsammiidae Reuss, 1854
- Family Balticinidae Balss, 1910
- Family Briareidae Gray, 1859
- Family Chelidonisididae Heestand Saucier, France & Watling, 2021
- Family Chrysogorgiidae Verrill, 1883
- Family Chunellidae Kükenthal, 1902
- Family Coralliidae Lamouroux, 1812
- Family Cornulariidae Dana, 1846
- Family Dendrobrachiidae Brook, 1889
- Family Echinoptilidae Hubrecht, 1885
- Family Ellisellidae Gray, 1859
- Family Erythropodiidae Kükenthal, 1916
- Family Funiculinidae Gray, 1860
- Family Gorgonellidae Valenciennes, 1855 accepted as Ellisellidae Gray, 1859
- Family Gyrophyllidae López-Gózalez, Drewery & Williams, 2022
- Family Halipteridae Williams, 1995 accepted as Balticinidae Balss, 1910
- Family Helioporidae Moseley, 1876
- Family Huziogorgiidae López-González, 2020 accepted as Ifalukellidae Bayer, 1955
- Family Ideogorgiidae McFadden, van Ofwegen & Quattrini, 2024
- Family Ifalukellidae Bayer, 1955
- Family Isidoidae Heestand Saucier, France & Watling, 2021
- Family Keratoisididae Gray, 1870
- Family Kophobelemnidae Gray, 1860
- Family Lithotelestidae Bayer & Muzik, 1977 accepted as Aulopsammiidae Reuss, 1854
- Family Lithothelestidae accepted as Lithotelestidae Bayer & Muzik, 1977
- Family Mopseidae Gray, 1870
- Family Paragorgiidae Kükenthal, 1916 accepted as Coralliidae Lamouroux, 1812
- Family Parasphaerascleridae McFadden & van Ofwegen, 2013
- Family Parisididae Aurivillius, 1931
- Family Pavonariidae Jungersen, 1904 accepted as Balticinidae Balss, 1910
- Family Pennatulidae Ehrenberg, 1828
- Family Pleurogorgiidae Cairns, Cordeiro & Alderslade in Cairns et al., 2021
- Family Primnoidae Gray, 1857
- Family Protoptilidae Kölliker, 1872
- Genus Distichoptilum Verrill, 1882
- Genus Helicoptilum Nutting, 1912 accepted as Distichoptilum Verrill, 1882
- Genus Juncoptilum Thomas & Henderson, 1905 accepted as Distichoptilum Verrill, 1882
- Genus Protoptilum Kölliker, 1872
- Family Pseudumbellulidae López-González in López-González & Drewery, 2022
- Family Pteroeididae accepted as Pennatulidae Ehrenberg, 1828
- Family Pteroididae accepted as Pteroeididae
- Family Renillidae Gray, 1860
- Family Sarcodictyonidae McFadden, van Ofwegen & Quattrini, 2024
- Family Scleroptilidae Jungersen, 1904
- Family Spongiodermidae Wright & Studer, 1889
- Family Stachyptilidae Kölliker, 1880
- Family Umbellulidae Lindahl, 1874 (1840)
- Family Veretillidae Herklots, 1858
- Family Virgulariidae Verrill, 1868
- Genus Glyptosceptron Böhm, 1891 †
- Genus Helicogorgia Bayer, 1981
- Genus Helicogorgia Verrill, 1883 accepted as Helicogorgia Bayer, 1981
- Genus Hicksonella Simpson, 1910 accepted as Helicogorgia Bayer, 1981
- Genus Kaluginella Kuz'micheva, 1980 †
- Genus Palaeosceptron de Stefani, 1885 †
- Genus Simpsonella Stiasny, 1940 accepted as Helicogorgia Bayer, 1981
- Genus Stephanogorgia Bayer & Muzik, 1976
- Order Stolonifera accepted as Malacalcyonacea
- Family Haimeidae Wright, 1865
- Family Pseudogorgiidae Utinomi & Harada, 1973
- Family Waiparaconidae Buckeridge, 1993 †
- Genus Aspera Dautova, 2018
- Genus Axogaster Lonsdale in Dixon, 1850 †
- Genus Bayergorgia Williams & López-González, 2005
- Genus Briareopsis Bayer, 1993
- Genus Caliacis Deichmann, 1936
- Genus Canarya Ocaña & van Ofwegen, 2003
- Genus Catenatus Carrera, Voldman, Mango & Nestell, 2021 †
- Genus Ceratocaulon Jungersen, 1892
- Genus Chalcogorgia Bayer, 1949
- Genus Chengjiangopenna Shu & Conway Morris, 2006 †
- Genus Chirobelemnon Pfeffer, 1887
- Genus Chondronephthya Utinomi, 1960
- Genus Daniela Koch, 1891
- Genus Dendrogorgia Duchassaing, 1870
- Genus Denhartogia Ocaña & van Ofwegen, 2003
- Genus Distichogorgia Bayer, 1979
- Genus Elasma Wright & Studer, 1887 accepted as Elasmogorgia Wright & Studer, 1889
- Genus Elasmogorgia Wright & Studer, 1889
- Genus Eogorgia Hickson, 1938 †
- Genus Flagelligorgia Cairns & Cordeiro, 2017
- Genus Hookerella Gray, 1870
- Genus Hypnogorgia Duchassaing & Michelotti, 1864
- Genus Inflatocalyx Verseveldt & Bayer, 1988
- Genus Lafustalcyon Denayer, Poty, Tourneur & Aretz, 2023 †
- Genus Lanthanocephalus Williams & Starmer, 2000
- Genus Lignopsis Pérez & Zamponi, 2000
- Genus Mesogligorgia López-González, 2007
- Genus Moolabalia Alderslade, 2001
- Genus Ojeda Duchassaing & Michelotti, 1860
- Genus Pachysceptron Haas, 1909 †
- Genus Paramoltkia Löser, 1996 †
- Genus Petilavenula Cope, 2005 †
- Genus Phrontis Duchassaing, 1870
- Genus Proheliopora Kuz'micheva, 1975 †
- Genus Pseudocladochonus Versluys, 1907
- Genus Pseudosuberia Kükenthal, 1919
- Genus Pseudothesea Kükenthal, 1919
- Genus Raynerella Gray, 1869
- Genus Rhipidella Gray, 1870
- Genus Rolandia de Lacaze-Duthiers, 1900
- Genus Sarcogorgia Gray, 1857
- Genus Scleranthelia Studer, 1878
- Genus Skleranthelia Studer, 1879 accepted as Scleranthelia Studer, 1878
- Genus Speirogorgia Williams, 2019
- Genus Sphaeralcyon López-González & Gili, 2005
- Genus Stereogorgia Kükenthal, 1916
- Genus Stereosoma Hickson, 1930
- Genus Sydella Gray, 1873
- Genus Termieralcyon Fernández-Martínez, Coronado, Rodríguez, Tourneur & Badpa, 2019 †
- Genus Tesseranthelia Bayer, 1981
- Genus Thelogorgia Bayer, 1991
- Genus Tubigorgia Pasternak, 1985
- Genus Verseveldtia Williams, 1990
- Genus Williamsium Moore, Alderslade & Miller, 2017
- Genus Xenogorgia Bayer & Muzik, 1976
- 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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