Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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- Biota (12 687)
- Kingdom Animalia (9 793)
- Phylum Acanthocephala (30)
- Phylum Annelida (618)
- Phylum Arthropoda (4 266)
- Phylum Brachiopoda (64)
- Phylum Bryozoa (363)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (25)
- Phylum Chordata (1 415)
- Phylum Cnidaria (460)
- Phylum Ctenophora (11)
- Phylum Dicyemida (1)
- Phylum Echinodermata (638)
- Subphylum Asterozoa (412)
- Class Asteroidea (290)
- Class Ophiuroidea (122)
- Subclass Myophiuroida (122)
- Infraclass Metophiurida (122)
- Superorder Euryophiurida (70)
- Order Euryalida (6)
- Order Ophiurida (64)
- Suborder Laemophiurina
- Suborder Ophiomusina (2)
- Suborder Ophiomyxina accepted as Ophiomyxidae Ljungman, 1867
- Suborder Ophiurida incertae sedis
- Suborder Ophiurina (62)
- Infraorder Chilophiurina accepted as Ophiuridae Müller & Troschel, 1840
- Infraorder Ophiolepidina accepted as Ophiurina
- Family Astrophiuridae Sladen, 1879 (2)
- Family Ophiopyrgidae Perrier, 1893 (43)
- Genus Amphiophiura Matsumoto, 1915 (4)
- Genus Anophiura H.L. Clark, 1939 (1)
- Genus Euvondrea Fell, 1961 (1)
- Genus Glaciacantha Fell, 1961 (2)
- Species Glaciacantha doederleini (Hertz, 1927)
- Species Glaciacantha dubium (Koehler, 1900)
- Species Glaciacantha jason Fell, 1961 accepted as Ophiocten dubium Koehler, 1900
- Genus Ophiogona Studer, 1876 (2)
- Genus Ophiomages Koehler, 1923 (1)
- Genus Ophioperla Koehler, 1912 (1)
- Genus Ophioplinthus Lyman, 1878 (18)
- Genus Ophiopyrgus Lyman, 1878 (1)
- Genus Ophiosparte Koehler, 1922 (1)
- Genus Ophiosteira Bell, 1902 (5)
- Genus Ophiuroglypha Hertz, 1927 (6)
- Family Ophiuridae Müller & Troschel, 1840 (17)
- Superorder Ophintegrida (52)
- Subclass Myophiuroidea accepted as Myophiuroida
- Order Gnathophiurida accepted as Gnathophiurina
- Order Ophiuroidea Incertae sedis
- Order Phrynophiurida
- Class Stelleroidea accepted as Asterozoa
- Subphylum Crinozoa (48)
- Subphylum Echinozoa (178)
- Phylum Ectoprocta accepted as Bryozoa
- Phylum Entoprocta
- Phylum Gastrotricha (1)
- Phylum Gnathostomulida
- Phylum Hemichordata (6)
- Phylum Kinorhyncha (9)
- Phylum Loricifera
- Phylum Mesozoa accepted as Dicyemida
- Phylum Mollusca (753)
- Phylum Nematoda (396)
- Phylum Nemertea (75)
- Phylum Nemertina represented as Nemertea
- Phylum Platyhelminthes (134)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (281)
- Phylum Priapulida (4)
- Phylum Rotifera (163)
- Phylum Tardigrada (80)
- Kingdom Archaea (1)
- Kingdom Bacteria (310)
- Kingdom Chromista (956)
- Kingdom Fungi (740)
- Kingdom Plantae (822)
- Kingdom Protozoa (65)
