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
- Family Acanthoaxiidae van Ofwegen & McFadden, 2010
- Family Acanthogorgiidae Gray, 1859
- Family Acrophytidae McFadden & van Ofwegen, 2017
- Family Acrossotidae Bourne, 1914
- Family Alcyonidae accepted as Alcyoniidae Lamouroux, 1812
- Family Alcyoniidae Lamouroux, 1812
- Genus Alcionium Linnaeus, 1767 accepted as Alcyonium Linnaeus, 1758
- Genus Alcyonia Pallas, 1787 accepted as Alcyonium Linnaeus, 1758
- Genus Alcyonidium auct. accepted as Alcyonium Linnaeus, 1758
- Genus Alcyonium Linnaeus, 1758
- Genus Alcyonum Rafinesque, 1815 accepted as Alcyonium Linnaeus, 1758
- Genus Anthothela Verrill, 1879
- Genus Barrathrobius Danielssen, 1887 accepted as Gersemia Marenzeller, 1877
- Genus Bellonella Gray, 1862
- Species Bellonella bocagei (Kent, 1870)
- Species Bellonella capitata (Pfeffer, 1889)
- Species Bellonella cinera (Tixier-Durivault & d'Hondt, 1974)
- Species Bellonella clavata (Pfeffer, 1889)
- Species Bellonella conspicua Tixier-Durivault, 1961
- Species Bellonella epedana Verseveldt & Bayer, 1988
- Species Bellonella granulata Gray, 1862
- Species Bellonella indica Thomson & Henderson, 1905 accepted as Paraminabea indica (Thomson & Henderson, 1905)
- Species Bellonella molokaiensis Verseveldt & Bayer, 1988
- Species Bellonella petila Verseveldt & Bayer, 1988
- Species Bellonella rigida Putter, 1900
- Species Bellonella rubistella Deichmann, 1936
- Species Bellonella rubra Brundin, 1896
- Species Bellonella sibogae Utinomi, 1957 accepted as Nidalia macrospina (Kükenthal, 1906)
- Species Bellonella tenuis Tixier-Durivault & d'Hondt, 1974
- Species Bellonella unilobata (Thomson, 1921)
- Species Bellonella variabilis (Studer, 1891)
- Genus Belonella accepted as Bellonella Gray, 1862
- Genus Cereopsis Saville Kent, 1870 accepted as Bellonella Gray, 1862
- Genus Eleutherobia Pütter, 1900
- Genus Fulla Danielssen, 1886 accepted as Gersemia Marenzeller, 1877
- Genus Gersemia Marenzeller, 1877
- Genus Gersemiopsis Danielssen, 1886 accepted as Gersemia Marenzeller, 1877
- Genus Halcyonia Pallas, 1787 accepted as Alcyonium Linnaeus, 1758
- Genus Halcyonium Esper, 1805 accepted as Alcyonium Linnaeus, 1758
- Genus Hedera Conti-Jerpe & Freshwater, 2017
- Genus Kotatea Kessel et al., 2022
- Genus Lateothela Moore, Alderslade & Miller, 2017
- Genus Lithophyta Forskål, 1775 accepted as Litophyton Forskål, 1775
- Genus Lithophytum Agassiz, 1844 accepted as Litophyton Forskål, 1775
- Genus Lobularia Lamarck, 1816 accepted as Alcyonium Linnaeus, 1758
- Genus Metalcyonium Pfeffer, 1889 accepted as Bellonella Gray, 1862
- Genus Muricellisis Kükenthal, 1915 accepted as Anthothela Verrill, 1879
- Genus Nannodendron Danielssen, 1886 accepted as Gersemia Marenzeller, 1877
- Genus Organidus Danielssen, 1887 accepted as Gersemia Marenzeller, 1877
- Genus Parerythropodium Kükenthal, 1916 accepted as Alcyonium Linnaeus, 1758
- Genus Pseudoalcyonium Tixier-Durivault & d'Hondt, 1975 accepted as Alcyonium Linnaeus, 1758
- Genus Sarakka Danielssen, 1887 accepted as Gersemia Marenzeller, 1877
- Genus Ushanaia Kessel et al., 2022
- Genus Voeringia Danielssen, 1886 accepted as Gersemia Marenzeller, 1877
- Family Anthogorgiidae McFadden, van Ofwegen & Quattrini, 2024
- Family Anthothelidae Broch, 1916 accepted as Alcyoniidae Lamouroux, 1812
- Family Aquaumbridae Breedy, van Ofwegen & Vargas, 2012
- Family Arulidae McFadden & Ofwegen, 2012
- Family Asterospiculariidae Utinomi, 1951 accepted as Xeniidae Ehrenberg, 1828
- Family Astrogorgiidae McFadden, van Ofwegen & Quattrini, 2024
- Family Astrospiculariidae accepted as Asterospiculariidae Utinomi, 1951
- Family Capnellidae McFadden, van Ofwegen & Quattrini, 2024
- Family Carijoidae McFadden, van Ofwegen & Quattrini, 2024
- Family Cerveridae McFadden, van Ofwegen & Quattrini, 2024
- Family Cladiellidae McFadden, van Ofwegen & Quattrini, 2024
- Family Clavulariidae Hickson, 1894
- Family Coelogorgiidae Bourne, 1900
- Family Corymbophytidae McFadden & van Ofwegen, 2017
- Family Discophytidae McFadden, van Ofwegen & Quattrini, 2024
- Family Eunicellidae McFadden, van Ofwegen & Quattrini, 2024
- Family Euplexauridae McFadden, van Ofwegen & Quattrini, 2024
- Family Gorgoniidae Lamouroux, 1812
- Family Incrustatidae McFadden, van Ofwegen & Quattrini, 2024
- Family Isididae Lamouroux, 1812
- Family Keroeididae Kinoshita, 1910
- Family Lemnaliidae Gray, 1869
- Family Leptophytidae McFadden & van Ofwegen, 2017
- Family Maasellidae Poche, 1914 accepted as Paralcyoniidae Gray, 1869
- Family Malacacanthidae McFadden, van Ofwegen & Quattrini, 2024
- Family Melithaeidae Gray, 1870
- Family Melitodidae accepted as Melithaeidae Gray, 1870
- Family Muriceidae accepted as Plexauridae Gray, 1859
- Family Nephtheidae Gray, 1862
- Family Nephthyidae [Cnidaria, misspelling of Nephtheidae] accepted as Nephtheidae Gray, 1862
- Family Nephthyigorgiidae McFadden, van Ofwegen & Quattrini, 2024
- Family Nidaliidae Gray, 1869
- Family Paralcyoniidae Gray, 1869
- Family Paramuriceidae Bayer, 1956
- Family Plexaurellidae Verrill, 1912
- Family Plexauridae Gray, 1859
- Family Pseudonephtheidae McFadden, van Ofwegen & Quattrini, 2024
- Family Pterogorgiidae McFadden, van Ofwegen & Quattrini, 2024
- Family Rosgorgiidae McFadden, van Ofwegen & Quattrini, 2024
- Family Sarcophytidae Gray, 1869
- Family Scleracidae McFadden, van Ofwegen & Quattrini, 2024
- Family Sinulariidae McFadden, van Ofwegen & Quattrini, 2024
- Family Siphonogorgiidae Kölliker, 1874
- Family Skamnariidae McFadden, van Ofwegen & Quattrini, 2024
- Family Subergorgiidae Gray, 1859
- Family Taiaroidae Bayer & Muzik, 1976
- Family Telestidae Milne Edwards & Haime, 1857 accepted as Tubiporidae Ehrenberg, 1828
- Family Tubiporidae Ehrenberg, 1828
- Family Victorgorgiidae Moore, Alderslade & Miller, 2017
- Family Viguieriotidae Bayer, 1954 accepted as Paralcyoniidae Gray, 1869
- Family Xeniidae Ehrenberg, 1828
- Genus Alaskagorgia Sánchez & Cairns, 2004
- Genus Calcigorgia Broch, 1935
- Genus Cryogorgia Williams, 2005
- Genus Cyclomuricea Nutting, 1908
- Genus Elenanthus Sanamyan & Sanamyan, 2020
- Genus Filigella Gray, 1868 accepted as Thesea Duchassaing & Michelotti, 1860
- Genus Pseudothelogorgia van Ofwegen, 1994
- Genus Sueciatractos Reich & Kutscher, 2023 †
- Genus Thesea Duchassaing & Michelotti, 1860
- Order Pennatulacea accepted as Scleralcyonacea
- Order Scleralcyonacea
- 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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