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
- Family Acontiophoridae Carlgren, 1938
- Family Acricoactinidae Larson, 2016 †
- Family Actinernidae Stephenson, 1922
- Family Actiniaria (awaiting allocation)
- Family Actiniaria incertae sedis
- Family Actiniidae Gosse, 1858
- Family Actinodendridae Haddon, 1898
- Family Actinodendronidae Haddon, 1898 accepted as Actinodendridae Haddon, 1898
- Family Actinoscyphiidae Stephenson, 1920
- Family Actinostolidae Carlgren, 1932
- Family Aiptasiidae Carlgren, 1924
- Family Aiptasiomorphidae Carlgren, 1949
- Family Aliciidae Duerden, 1897
- Family Andresiidae Stephenson, 1922
- Family Andvakiidae Danielssen, 1890
- Family Andwakiidae Danielssen, 1890 accepted as Andvakiidae Danielssen, 1890
- Family Antheidae Gosse, 1860
- Family Antheomorphidae Hertwig, 1882
- Family Antipodactidae Rodríguez, López-González & Daly, 2009
- Family Antipodactinidae Rodríguez, López-González & Daly, 2009
- Family Aurelianidae
- Family Aurelianiidae Andres, 1883 accepted as Aurelianidae
- Family Bathyphellidae accepted as Bathyphelliidae Carlgren, 1932
- Family Bathyphelliidae Carlgren, 1932
- Family Boloceroididae Carlgren, 1924
- Family Capneidae Gosse, 1860
- Family Condylanthidae Stephenson, 1922
- Family Diadumenidae Stephenson, 1920
- Family Edwardsiidae Andres, 1881
- Family Endomyaria (awaiting allocation)
- Family Exocoelactiidae Carlgren, 1928 accepted as Exocoelactinidae Carlgren, 1925
- Family Exocoelactinidae Carlgren, 1925
- Family Galatheanthemidae Carlgren, 1956
- Family Gonactiniidae Carlgren, 1893
- Family Halcampidae Andres, 1923
- Family Halcampoididae Appellöf, 1896
- Family Halcampulactidae Gusmão, Berniker, Van Deusen, Harris & Rodríguez, 2019
- Family Halcuriidae Carlgren, 1918
- Family Haliactiidae Carlgren, 1949 accepted as Haliactinidae Carlgren, 1949
- Family Haliactinidae Carlgren, 1949
- Family Haliplanellidae Hand, 1956
- Family Haloclavidae Verrill, 1899
- Family Homostichanthidae
- Family Hormathiidae Carlgren, 1925
- Genus Aceractis Andres, 1883
- Genus Actinauge Verrill, 1883
- Genus Adamsia Forbes, 1840
- Genus Allantactis Danielssen, 1890
- Genus Altantactis Verrill, 1899 accepted as Allantactis Danielssen, 1890
- Genus Amphianthus Hertwig, 1882
- Species Amphianthus armatus Carlgren, 1928
- Species Amphianthus bathybium Hertwig, 1882
- Species Amphianthus brunneus (Pax, 1909)
- Species Amphianthus californicus Carlgren, 1936
- Species Amphianthus capensis Carlgren, 1928
- Species Amphianthus caribaea (Verrill, 1899)
- Species Amphianthus caribaeus (Verrill, 1899)
- Species Amphianthus caribea (Verrill, 1899) accepted as Amphianthus caribaea (Verrill, 1899)
- Species Amphianthus crassus (Gravier, 1918)
- Species Amphianthus dohrni (von Koch, 1878)
- Species Amphianthus dohrnii (Koch, 1878) accepted as Amphianthus dohrni (von Koch, 1878)
- Species Amphianthus giganteus (Carlgren, 1941) accepted as Phelliactis gigantea (Carlgren, 1941)
- Species Amphianthus giganteus Carlgren, 1941 accepted as Phelliactis gigantea (Carlgren, 1941)
- Species Amphianthus hyalonematis Mc Murr. accepted as Stephanauge hyalonematis (McMurrich, 1893)
- Species Amphianthus impeditus (Gravier, 1918)
- Species Amphianthus ingolfi Carlgren, 1942
- Species Amphianthus inornata (Gravier, 1918) accepted as Stephanactis inornata Gravier, 1918
- Species Amphianthus islandicus Carlgren, 1942
- Species Amphianthus lacteus (McMurrich, 1893)
- Species Amphianthus laevis Carlgren, 1938
- Species Amphianthus margaritaceus (Danielssen, 1890)
- Species Amphianthus michaelsarsi Carlgren, 1934
- Species Amphianthus minutus (Hertwig, 1882)
- Species Amphianthus mirabilis (Verrill, 1879)
- Species Amphianthus mopseae (Danielssen, 1890)
- Species Amphianthus mopsiae (Danielssen, 1890) accepted as Amphianthus mopseae (Danielssen, 1890)
- Species Amphianthus natalensis Carlgren, 1938
- Species Amphianthus nitidus (Verrill, 1899)
- Species Amphianthus norvegicus Carlgren, 1942
- Species Amphianthus ornatum Hertwig, 1888 accepted as Amphianthus bathybium Hertwig, 1882
- Species Amphianthus ornatus Hertwig, 1888 accepted as Amphianthus bathybium Hertwig, 1882
- Species Amphianthus radiatus Carlgren, 1928
- Species Amphianthus rosaceus Wassilieff, 1908
- Species Amphianthus sanctae helenae Carlgren, 1941 accepted as Amphianthus sanctaehelenae Carlgren, 1941
- Species Amphianthus sanctaehelenae Carlgren, 1941
- Species Amphianthus tuberculatum accepted as Stephanauge tuberculata (Hertwig, 1882)
- Species Amphianthus valdiviae Carlgren, 1928
- Species Amphianthus vermiculatus Carlgren, 1942 accepted as Amphianthus verruculatus Carlgren, 1942
- Species Amphianthus verruculatus Carlgren, 1942
- Genus Amphiantus accepted as Amphianthus Hertwig, 1882
- Genus Calliactis Verrill, 1869
- Genus Calliactus accepted as Calliactis Verrill, 1869
- Genus Cataphellia Stephenson, 1929
- Genus Chitonactes accepted as Chitonactis Fischer, 1874
- Genus Chitonactis Fischer, 1874
- Genus Chitonanthus McMurrich, 1893
- Genus Chondrachtinia accepted as Chondractinia Lütken, 1861
- Genus Chondractinia Lütken, 1861 accepted as Hormathia Gosse, 1859
- Genus Chondranthus Migot & Portmann, 1926
- Genus Chondrodactis Wassilieff, 1908 accepted as Phelliactis Simon, 1892
- Genus Chondrophella Carlgren, 1925 accepted as Chondrophellia Carlgren, 1925
- Genus Chondrophellia Carlgren, 1925
- Genus Cricophorus Carlgren, 1924
- Genus Gephyra Koch, 1878 accepted as Amphianthus Hertwig, 1882
- Genus Gephyropsis Carlgren, 1925
- Genus Gliactis Gravier, 1918
- Genus Gliatactis accepted as Gliactis Gravier, 1918
- Genus Helaria Stechow, 1921
- Genus Heliactis Thompson, 1858
- Genus Homathia accepted as Hormathia Gosse, 1859
- Genus Hormathia Gosse, 1859
- Genus Hormathianthus Carlgren, 1943
- Genus Hormathiogeton Carlgren, 1942
- Genus Hormatia accepted as Hormathia Gosse, 1859
- Genus Korenia Danielssen, 1890
- Genus Leiptoteichus accepted as Leptoteichus Stephenson, 1918
- Genus Leptoteichus Stephenson, 1918
- Genus Lilliella Stephenson, 1918
- Genus Medusa Linnaeus, 1758
- Genus Monactis Riemann-Zürneck, 1986
- Genus Paracalliactis Carlgren, 1928
- Genus Paractinia Andres, 1883
- Genus Paraphellia Verrill, 1868
- Genus Paraphellia Haddon, 1889
- Genus Paraphelliactis Carlgren, 1928
- Genus Parastephanauge Dufaure, 1959
- Genus Phelliactis Simon, 1892
- Genus Phelliopsis Fischer, 1887
- Genus Phelliopsis Verrill, 1899 accepted as Phelliopsis Fischer, 1887
- Genus Raphactis Verrill, 1899
- Genus Stephanactis Hertwig, 1882 accepted as Stephanauge Verrill, 1899
- Genus Stephanauge Verrill, 1899
- Genus Synanthus Verrill, 1879
- Family Iosactiidae Riemann-Zürneck, 1997
- Family Iosactinidae Riemann-Zürneck, 1997
- Family Isanthidae Carlgren, 1938
- Family Isophellidae
- Family Isophelliidae Stephenson, 1935
- Family Kadosactidae Riemann-Zürneck, 1991 accepted as Kadosactinidae Riemann-Zürneck, 1991
- Family Kadosactinidae Riemann-Zürneck, 1991
- Family Kapneidae accepted as Aurelianidae
- Family Limnactiniidae Carlgren, 1921
- Family Liponematidae Hertwig, 1882
- Family Mackenziidae Conway Morris, 1993 †
- Family Metridiidae Carlgren, 1893
- Family Mimetriidae Fautin, Eppard & Mead, 1988
- Family Minyadidae Milne-Edwards, 1857
- Family Nemanthidae Carlgren, 1940
- Family Nevadneidae Carlgren, 1925
- Family Octineonidae Fowler, 1894
- Family Oractiidae Riemann-Zürneck, 2000
- Family Ostiactinidae Rodríguez, Barbeitos, Daly, Gusmão & Häussermann, 2012
- Family Phymanthidae Andres, 1883
- Family Polyopidae Hertwig, 1882
- Family Preactiidae England in England & Robson, 1984 accepted as Preactiniidae England in England & Robson, 1984
- Family Preactiniidae England in England & Robson, 1984
- Family Ptychodactiidae Appellöf, 1893 accepted as Ptychodactinidae Appellöf, 1893
- Family Ptychodactinidae Appellöf, 1893
- Family Ramireziidae Fautin, Eppard & Mead, 1988 accepted as Acontiophoridae Carlgren, 1938
- Family Sagartiidae Gosse, 1858
- Family Sagartiomorphidae Carlgren, 1934
- Family Sarcophinanthidae Andres, 1883
- Family Spongiactinidae Sanamyan, Sanamyan & Tabachnick, 2012
- Family Stichodactylidae Andres, 1883
- Family Stoichactidae
- Family Thalassianthidae Milne-Edwards, 1857
- Order Antipatharia
- Order Ceriantharia
- Order Corallimorpharia
- Order Hexanthiniaria †
- Order Kilbuchophyllida †
- Order Ptychodactiaria accepted as Actiniaria
- Order Scleractinia
- 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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