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
- Subphylum Medusozoa incertae sedis
- Subphylum Myxozoa
- Class Cnidaria (awaiting allocation)
- Class Cubozoa
- Class Cyclozoa
- Class Hydroconozoa †
- Class Hydrozoa
- Order Actinulida
- Order Anthoathecata
- Family Acaulidae Fraser, 1924
- Family Anthoathecata incertae sedis
- Genus Amphibrachium Hertwig, 1879 accepted as Bibrachium Stechow, 1919
- Genus Bertratis Larson & Briggs, 2023 †
- Genus Bibrachium Stechow, 1919
- Genus Microstoma Lesson, 1830
- Genus Saccohydra Billard, 1914
- Family Asyncorinidae
- Family Asyncorynidae Kramp, 1949
- Family Australomedusidae Russell, 1970
- Family Axoporidae Boschma, 1951 †
- Family Balellidae Stechow, 1922
- Family Bimeridae Allman, 1872 accepted as Bougainvilliidae Lütken, 1850
- Family Boeromedusidae Bouillon, 1995
- Family Boreohydridae Westblad, 1947
- Family Bougainvilliidae Lütken, 1850
- Family Bythotiaridae Maas, 1905
- Family Calycopsidae Bigelow, 1913 accepted as Bythotiaridae Maas, 1905
- Family Candelabridae Stechow, 1921
- Family Capitata (awaiting allocation)
- Family Capitata incertae sedis
- Family Ceratelladae Gray, 1868 accepted as Solanderiidae Marshall, 1892
- Family Cladocorynidae Allman, 1872
- Family Cladonematidae Gegenbaur, 1857
- Family Cladonemidae accepted as Cladonematidae Gegenbaur, 1857
- Family Cladosarsiidae Bouillon, 1978
- Family Clathrozoellidae Peña Cantero, Vervoort & Watson, 2003
- Family Clavidae McCrady, 1859 accepted as Hydractiniidae L. Agassiz, 1862
- Family Clavopsellidae Thiel, 1962 accepted as Bougainvilliidae Lütken, 1850
- Family Codonidae Haeckel, 1879 accepted as Corynidae Johnston, 1836
- Family Cordylophoridae von Lendenfeld, 1885
- Family Corymorphidae Allman, 1872
- Family Corynidae Johnston, 1836
- Family Cytaeidae
- Family Dicorynidae Allman, 1864 accepted as Bougainvilliidae Lütken, 1850
- Family Eleutheriidae Russell, 1953 accepted as Cladonematidae Gegenbaur, 1857
- Family Eucodoniidae Schuchert, 1996
- Family Eudendriidae Hincks, 1868
- Family Euphysidae Hacekel, 1879 accepted as Corymorphidae Allman, 1872
- Family Filifera incertae sedis
- Family Halimedusidae Arai & Brinckmann-Voss, 1980
- Family Halocordylidae accepted as Pennariidae McCrady, 1859
- Family Halocorynidae Picard, 1957 accepted as Zancleidae Russell, 1953
- Family Heterastrididae Frech, 1890 † accepted as Heterastridiidae Frech, 1890 †
- Family Heterastridiidae Frech, 1890 † accepted as Milleporidae Fleming, 1828
- Family Heterotentaculidae Schuchert, 2010
- Family Hippocrenidae McCrady, 1959 accepted as Bougainvilliidae Lütken, 1850
- Family Hybocodonidae Allman, 1872 accepted as Tubulariidae Fleming, 1828
- Family Hydractiniidae L. Agassiz, 1862
- Family Hydrichthyidae accepted as Pandeidae Haeckel, 1879
- Family Hydridae Dana, 1846
- Family Hydrocorynidae Rees, 1957
- Family Jeanbouilloniidae Pagès, Flood & Youngbluth, 2006
- Family Lizusidae Haeckel, 1879 accepted as Bougainvilliidae Lütken, 1850
- Family Magapiidae Schuchert & Bouillon, 2009
- Family Margelidae Haeckel, 1879 accepted as Bougainvilliidae Lütken, 1850
- Family Margelopsidae Uchida, 1927
- Family Milleporidae Fleming, 1828
- Family Milleporina (awaiting allocation)
- Family Myriothelidae Hincks, 1868 accepted as Candelabridae Stechow, 1921
- Family Nemopsidae L. Agassiz, 1862 accepted as Bougainvilliidae Lütken, 1850
- Family Niobiidae Petersen, 1979
- Family Oceanidae accepted as Oceaniidae Eschscholtz, 1829
- Family Oceaniidae Eschscholtz, 1829
- Family Pachycordylidae
- Family Pandeidae Haeckel, 1879
- Family Pandeiidae Haeckel, 1879 accepted as Pandeidae Haeckel, 1879
- Family Paracorynidae Picard, 1957
- Family Pennariidae McCrady, 1859
- Family Platystomidae Zhang, 1982 accepted as Australomedusidae Russell, 1970
- Family Polyorchidae Agassiz, 1862 accepted as Corynidae Johnston, 1836
- Family Protiaridae Haeckel, 1879
- Family Protohydridae Allman, 1888
- Family Pseudosolanderiidae
- Family Ptilocodiidae Coward, 1909
- Family Rathkeidae Russell, 1953
- Family Rhysiidae Brinckmann, 1965
- Family Rosalindidae Bouillon, 1985
- Family Russelliidae Kramp, 1957 accepted as Heterotentaculidae Schuchert, 2010
- Family Similiclavidae Calder, Choong & McDaniel, 2015
- Family Solanderiidae Marshall, 1892
- Family Sphaerocorynidae Prévot, 1959
- Family Stylasteridae Gray, 1847
- Family Symplectaneidae Fraser, 1941 accepted as Candelabridae Stechow, 1921
- Family Teissieridae Bouillon, 1978
- Family Thamnostomidae Haeckel, 1879 accepted as Bougainvilliidae Lütken, 1850
- Family Tiarannidae Russell, 1950
- Family Tiaridae Haeckel, 1879 accepted as Pandeidae Haeckel, 1879
- Family Trichydridae Hincks, 1868
- Family Tricyclusidae Kramp, 1949
- Family Tubidendridae Nutting, 1905 accepted as Balellidae Stechow, 1922
- Family Tubulariae Goldfuss, 1818 accepted as Tubulariidae Fleming, 1828
- Family Tubulariidae Fleming, 1828
- Family Turbulariidae
- Family Zancleidae Russell, 1953
- Family Zancleopsidae Bouillon, 1978
- Order Anthomedusae (awaiting allocation)
- Order Chondrophora
- Order Discomedusae
- Order Hydroida
- Order Hydrozoa (awaiting allocation)
- Order Hydrozoa incertae sedis
- Order Lemniscaterina †
- Order Leptomedusae
- Order Leptothecata
- Order Limnomedusae
- Order Milleporina accepted as Anthoathecata
- Order Narcomedusae
- Order Siphonophora accepted as Siphonophorae
- Order Siphonophorae
- Order Siphonophorida accepted as Siphonophorae
- Order Sphaeractinida †
- Order Stylasterina accepted as Anthoathecata
- Order Trachylina
- Genus Cordubia Mayoral, Liñán, Gámez Vintaned, Muñiz & Gozalo, 2004 †
- Genus Sphaerostromella Yabe & Sugiyama, 1931 †
- 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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