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
- Order Arbacioida
- Order Archaeocidaroida
- Order Bothriocidaroida †
- Order Camarodonta
- Order Cassiduloida
- Order Cidaroida
- Family Anisocidaridae Vadet, 1999 †
- Family Cidaridae Gray, 1825
- Genus Abelleicidaris Vadet, 1991 † accepted as Plegiocidaris Pomel, 1883 †
- Genus Acanthocidaris Mortensen, 1903
- Genus Actinocidaris Mortensen, 1928 accepted as Prionocidaris A. Agassiz, 1863
- Genus Adelcidaris Cotton & Godfrey, 1942
- Genus Almucidaris Blake & Zinsmeister, 1991 †
- Genus Anomocidaris A. Agassiz & H.L. Clark, 1907 accepted as Phalacrocidaris Lambert, 1902
- Genus Aporocidaria
- Genus Aspidocidaris Mortensen, 1928 accepted as Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Aulacocidaris Lambert in Savin, 1903 † accepted as Plegiocidaris Pomel, 1883 †
- Genus Austrocidaris H.L. Clark, 1907
- Genus Calocidaris H.L. Clark, 1907
- Species Calocidaris micans (Mortensen, 1903)
- Genus Carantonicidaris Vadet, Nicolleau & Cottard, 2013 †
- Genus Centrocidaris A. Agassiz, 1904
- Genus Chondrocidaris A. Agassiz, 1863
- Genus Chorocidaris Ikeda, 1941
- Genus Cidaris Leske, 1778
- Genus Cidarites auct. accepted as Cidaris Leske, 1778
- Genus Compsocidaris Ikeda, 1939
- Genus Cyathocidaris Lambert, 1910 †
- Genus Cydaris Rafinesque, 1815 accepted as Cidaris Leske, 1778
- Genus Cyrtocidaris Mortensen, 1927 accepted as Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Delocidaris Philip, 1964 †
- Genus Discocidaris Döderlein, 1885 accepted as Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Dorocidaris A. Agassiz, 1869 accepted as Cidaris Leske, 1778
- Genus Eucidaris Pomel, 1883
- Genus Goniocidaria accepted as Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Gymnocidaris A. Agassiz, 1863 accepted as Eucidaris Pomel, 1883
- Genus Hesperocidaris Mortensen, 1928
- Genus Hirudocidaris Smith & Wright, 1989 †
- Genus Kionocidaris Mortensen, 1932
- Genus Leicidaris Delage & Hérouard, 1903 accepted as Leiocidaris Desor, 1855
- Genus Leiocidaris Desor, 1855 accepted as Phyllacanthus Brandt, 1835
- Genus Lhyllacanthus accepted as Phyllacanthus Brandt, 1835
- Genus Lissocidaris Mortensen, 1939
- Genus Menocidaris Philip, 1964 † accepted as Chondrocidaris A. Agassiz, 1863
- Genus Minicidaris Deraniyagala, 1961 †
- Genus Ogmocidaris Mortensen, 1921
- Genus Orthocidaris A. Agassiz, 1863 accepted as Cidaris Leske, 1778
- Genus Palmerius Cutress, 1980 †
- Genus Peiocidaris accepted as Leiocidaris Desor, 1855
- Genus Petalocidaris Mortensen, 1903 accepted as Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Phalacrocidaris Lambert, 1902
- Genus Phyllacanthus Brandt, 1835
- Genus Plegiocidaris Pomel, 1883 †
- Genus Pleurocidaris Pomel, 1883
- Genus Plococidaris Mortensen, 1909
- Genus Prionocidaris A. Agassiz, 1863
- Genus Procidaris Pávay, 1875 †
- Genus Prophyllacanthus Cutress, 1980 † accepted as Prionocidaris A. Agassiz, 1863
- Genus Psilocidaris Mortensen, 1927
- Genus Rabdocidaris Desor, 1855
- Genus Rhopalocidaris Mortensen, 1927
- Genus Romanocidaris Vadet, 1991 †
- Genus Santonicidaris Vadet, Nicolleau & Cottard, 2013 †
- Genus Schizocidaris Mortensen, 1903
- Genus Schleinitzia Studer, 1876 accepted as Prionocidaris A. Agassiz, 1863
- Genus Sinaecidaris Fourtau, 1921 †
- Genus Stephanocidaris A. Agassiz, 1863 accepted as Goniocidaris Desor in Agassiz & Desor, 1846
- Genus Stereocidaris Pomel, 1883
- Genus Stylocidaris Mortensen, 1909
- Genus Temnocidaris Cotteau, 1863 †
- Genus Tretocidaris Mortensen, 1903
- Genus Triassicidaris Smith, 1994 †
- Genus Typocidaris Pomel, 1883 †
- Family Cidaroida (awaiting allocation)
- Family Ctenocidaridae Mortensen, 1928
- Family Diplocidaridae Gregory, 1900 †
- Family Histocidaridae Lambert, 1900
- Family Miocidaridae Durham & Melville, 1957 †
- Family Nenoticidaridae Vadet, 1988 † accepted as Polycidaridae Vadet, 1988 †
- Family Paracidaridae Smith, 2015 †
- Family Paurocidaridae Vadet, 1999 †
- Family Polycidaridae Vadet, 1988 †
- Family Psychocidaridae Ikeda, 1936
- Family Rhabdocidaridae Lambert, 1900
- Family Roseicidaridae Vadet, 1991 accepted as Psychocidaridae Ikeda, 1936
- Family Serpianotiaridae Hagdorn, 1995 †
- Family Streptocidaridae Lambert, 1900 †
- Family Tetracidaridae Lambert, 1900 † accepted as Diplocidaridae Gregory, 1900 †
- Family Triadocidaridae Smith, 1994 †
- Family Typocidaridae Vadet, 1988 accepted as Cidaridae Gray, 1825
- Order Clypeasteroida
- Order Diadematoida
- Order Disasteroida †
- Order Echinocystitoida
- Order Echinoida
- Order Echinoidea (awaiting allocation)
- Order Echinoidea incertae sedis
- Order Echinothurioida
- Order Echinothuroida
- Order Euechinoidea incertae sedis
- Order Hemicidaroida †
- Order Holasteroida
- Order Holectypoida
- Order Neognathostomata incertae sedis
- Order Oligopygoida †
- Order Orthopsida †
- Order Palaechinoida †
- Order Pedinoida
- Order Phymosomatoida
- Order Plesiocidaroida †
- Order Pygasteroida †
- Order Salenioida
- Order Spatangoida
- Order Temnopleuroida
- Order Thielicidaroida
- Order Triadotiaroida †
- Genus Cunidentechinus Smith, 2016 †
- Class Edrioasteroidea †
- Class Edrioblastoidea †
- Class Eocrinoidea †
- Class Helicoplacoidea †
- Class Holothuroidea
- Class Homoiostelea †
- Class Homostelea †
- Class Ophiocistioidea †
- Class Ophiuroidea
- 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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