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
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Class Asteroidea
- Class Asterozoa (awaiting allocation)
- Class Blastoidea †
- Class Cornuta
- Class Coronata
- Class Coronoidea †
- Class Crinoidea
- Class Ctenocystoidea †
- Class Cystoidea
- Class Diploporita †
- Class Echinodermata (awaiting allocation)
- Class Echinodermata incertae sedis
- Class Echinoidea
- Class Edrioasteroidea †
- Class Edrioblastoidea †
- Class Eocrinoidea †
- Class Helicoplacoidea †
- Class Holothuroidea
- Class Homoiostelea †
- Class Homostelea †
- Class Ophiocistioidea †
- Class Ophiuroidea
- Order Euryalida
- Order Gnathophiurina
- Order Oegophiurida
- Order Ophiacanthida
- Order Ophioscolecida
- Order Ophiurida
- Family Amphilepidae accepted as Amphilepididae Matsumoto, 1915
- Family Amphilepididae Matsumoto, 1915
- Family Amphilimnidae O'Hara, Stöhr, Hugall, Thuy & Martynov, 2018
- Family Amphiuridae Ljungman, 1867
- Genus Acrocnida Gislén, 1926
- Genus Ailsaria Fell, 1962 accepted as Amphioplus Verrill, 1899
- Genus Amphiacantha Matsumoto, 1917 accepted as Dougaloplus A.M. Clark, 1970
- Genus Amphichilus Matsumoto, 1917
- Genus Amphichondrius Nielsen, 1932
- Genus Amphicontus Hill, 1940
- Genus Amphigyptis Nielsen, 1932 accepted as Amphipholizona Clark, 1915
- Genus Amphilycus Mortensen, 1933
- Genus Amphinephthys Fell, 1962
- Genus Amphinura Nobre, 1931 accepted as Amphiura Forbes, 1843
- Genus Amphiocnida Verrill, 1899 accepted as Ophiocentrus Ljungman, 1867
- Genus Amphiodia Verrill, 1899
- Genus Amphiomya H.L. Clark, 1939
- Genus Amphioncus Clark, 1939
- Genus Amphiopholis accepted as Amphipholis Ljungman, 1866
- Genus Amphioplus Verrill, 1899
- Genus Amphipholis Ljungman, 1866
- Genus Amphipholizona Clark, 1915
- Genus Amphipholus accepted as Amphipholis Ljungman, 1866
- Genus Amphipolis accepted as Amphipholis Ljungman, 1866
- Genus Amphispina Nielsen, 1932
- Genus Amphistigma H.L. Clark, 1938
- Genus Amphiura Forbes, 1843
- Genus Amphylicus accepted as Amphilycus Mortensen, 1933
- Genus Axiognathus Thomas, 1966 accepted as Amphipholis Ljungman, 1866
- Genus Ctenamphiura Verrill, 1899
- Genus Deckersamphiura Jagt, 2000 †
- Genus Diamphiodia Fell, 1962
- Genus Dougaloplus A.M. Clark, 1970
- Genus Dougalopus
- Genus Fellaria A.M. Clark, 1970
- Genus Gymnodia Fell, 1962 †
- Genus Hemilepis Ljungman, 1872 accepted as Amphiura Forbes, 1843
- Genus Icalia Fell, 1962 accepted as Amphiura Forbes, 1843
- Genus Lymanella A.M. Clark, 1970
- Genus Microphiopholis Turner, 1985
- Genus Micropholis Thomas, 1966 accepted as Microphiopholis Turner, 1985
- Genus Monamphiura Fell, 1962 accepted as Amphiura Forbes, 1843
- Genus Monamphuira
- Genus Monopholis Fell, 1962 accepted as Amphipholis Ljungman, 1866
- Genus Nannophiura Mortensen, 1933
- Genus Nudamphiura Tommasi, 1965
- Genus Nullamphiura Fell, 1962 accepted as Amphiura Forbes, 1843
- Genus Nullopholis Fell, 1962 accepted as Amphipholis Ljungman, 1866
- Genus Ophiocentrotus accepted as Ophiocentrus Ljungman, 1867
- Genus Ophiocentrus Ljungman, 1867
- Genus Ophiocnida Lyman, 1865
- Genus Ophiocnidella Ljungman, 1872
- Genus Ophiodaphne Koehler, 1930
- Genus Ophionema Lütken, 1869 accepted as Amphiura Forbes, 1843
- Genus Ophionephthys Lütken, 1869
- Genus Ophionephtys Koehler, 1903 accepted as Ophionephthys Lütken, 1869
- Genus Ophiopelta Lyman, 1882 accepted as Amphiura Forbes, 1843
- Genus Ophiopelte Verrill, 1899 accepted as Ophiopeltis Düben & Koren, 1846
- Genus Ophiopeltis Düben & Koren, 1846 accepted as Amphiura Forbes, 1843
- Genus Ophiophragmus Lyman, 1865
- Genus Ophiophragonus Gregory in Lankester, 1900 accepted as Ophiophragmus Lyman, 1865
- Genus Ophiosphaera Brock, 1888
- Genus Ophiostigma Lütken, 1856
- Genus Ophtonephthys Meissner in Bronn, 1901 accepted as Ophionephthys Lütken, 1869
- Genus Ophtonopthys Clark, 1915 accepted as Ophionephthys Lütken, 1869
- Genus Pandelia Fell, 1962 accepted as Amphiura Forbes, 1843
- Genus Pandellia
- Genus Paracrocnida Mortensen, 1940
- Genus Paramphichondrius Guille & Wolff, 1984
- Species Paramphichondrius tetradontus Guille & Wolff, 1984
- Genus Paramphiura Koehler, 1895
- Genus Silax Fell, 1962 accepted as Amphiura Forbes, 1843
- Genus Triodia A.M. Clark, 1970 † accepted as Triplodia Turner & Hallan, 2011
- Genus Triplodia Turner & Hallan, 2011 accepted as Silax Fell, 1962
- Genus Unioplus Fell, 1962
- Genus Xanthamphiura Hess, 1970 †
- Family Aplocomidae †
- Family Dermocomidae †
- Family Hemieuryalidae Verrill, 1899
- Family Ophiacanthidae Perrier, 1893
- Family Ophiactidae Matsumoto, 1915
- Family Ophiochitonidae Matsumoto, 1915
- Family Ophiocomidae Ljungman, 1867
- Family Ophiodermatidae Ljungman, 1867
- Family Ophiolepidae Ljungman, 1867 accepted as Ophiuridae Lyman, 1865
- Family Ophiolepididae Ljungman, 1867
- Family Ophioleucidae Matsumoto, 1915
- Family Ophiomusaidae O'Hara, Stöhr, Hugall, Thuy & Martynov, 2018
- Family Ophiomycetidae Verrill, 1899
- Family Ophionereididae Ljungman, 1867
- Family Ophiopyrgidae Perrier, 1893
- Family Ophiosphalmidae O'Hara, Stöhr, Hugall, Thuy & Martynov, 2018
- Family Ophiothricidae Ljungman, 1867 accepted as Ophiotrichidae Ljungman, 1867
- Family Ophiotrichidae Ljungman, 1867
- Family Ophiurida (awaiting allocation)
- Family Ophiuridae Lyman, 1865
- Family Ophiurinidae Gregory, 1897 †
- Order Ophiuroidea (awaiting allocation)
- Order Phrynophiurida
- Order Stenurida †
- Family Componasteridae Glass, Blake & Lefebvre, 2024 †
- Genus Maydena Jell, 2014 † accepted as Maydenaster Jell, 2020 †
- Genus Maydenaster Jell, 2020 †
- Genus Muldaster Thuy, Eriksson & Numberger-Thuy in Thuy et al., 2022 †
- Genus Ophiobartia Loba in Loba & Radwańska, 2022 †
- Genus Ophiolofsson Thuy, Eriksson, Kutscher & Numberger-Thuy, 2024 †
- Genus Ophiopetagno Thuy, Eriksson & Numberger-Thuy in Thuy et al., 2022 †
- Genus Ophiosuperstes Thuy, Maxwell & Pruss, 2021 †
- Genus Triadoleucella Ishida et al., 2022 †
- Class Parablastoidea †
- Class Paracrinoidea †
- Class Rhombifera †
- Class Somasteroidea
- Class Stelleroidea
- Class Stylophora †
- Genus Anadema Meuschen, 1787
- Genus Artocrea Meuschen, 1787
- Genus Birita Meuschen, 1787
- Genus Disci-transfixus Meuschen, 1787
- Genus Galea Meuschen, 1787
- Genus Olivaeformis Meuschen, 1787
- Genus Stribilita Meuschen, 1787
- 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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