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)
- Subphylum Chelicerata (489)
- Subphylum Crustacea (3 773)
- Superclass Allotriocarida (977)
- Superclass Multicrustacea (2 340)
- Class Copepoda (553)
- Infraclass Neocopepoda (553)
- Superorder Gymnoplea (316)
- Order Calanoida (316)
- Family Acartiidae Sars G.O., 1903 (5)
- Family Aetideidae Giesbrecht, 1892-1893 (60)
- Family Arietellidae Sars G.O., 1902 (1)
- Family Augaptilidae Sars G.O., 1905 (29)
- Family Bathypontiidae Brodsky, 1950 (1)
- Family Calanidae Dana, 1846 (11)
- Family Calocalanidae Bernard, 1958 accepted as Paracalanidae Giesbrecht, 1893
- Family Candaciidae Giesbrecht, 1892-1893 (4)
- Family Centropagidae Giesbrecht, 1892 (8)
- Family Clausocalanidae Giesbrecht, 1893 (11)
- Family Diaixidae Sars G.O., 1902 (1)
- Family Eucalanidae Giesbrecht, 1893 (3)
- Family Euchaetidae Giesbrecht, 1893 (26)
- Family Heterorhabdidae Sars G.O., 1902 (13)
- Family Hyperbionycidae Ohtsuka, Roe & Boxshall, 1993 (1)
- Family Lucicutiidae Sars G.O., 1902 (10)
- Family Mecynoceridae Andronov, 1973 accepted as Paracalanidae Giesbrecht, 1893
- Family Megacalanidae Sewell, 1947 (7)
- Family Metridinidae Sars G.O., 1902 (18)
- Family Nullosetigeridae Soh, Ohtsuka, Imabayashi & Suh, 1999 (1)
- Family Paracalanidae Giesbrecht, 1893 (17)
- Family Phaennidae Sars G.O., 1902 (17)
- Genus Brachycalanus Farran, 1905 (1)
- Genus Cephalophanes Sars G.O., 1907 (1)
- Genus Cornucalanus Wolfenden, 1905 (3)
- Genus Onchocalanus Sars G.O., 1905 (6)
- Genus Phaenna Claus, 1863 (1)
- Genus Talacalanus Wolfenden, 1911 (1)
- Genus Xanthocalanus Giesbrecht, 1893 (4)
- Family Phyllopodidae Brodsky, 1950 accepted as Nullosetigeridae Soh, Ohtsuka, Imabayashi & Suh, 1999
- Family Pontellidae Dana, 1852-1853
- Family Pseudocalanidae Sars G.O., 1901 accepted as Clausocalanidae Giesbrecht, 1893
- Family Pseudocyclopidae Giesbrecht, 1892-1893
- Family Pseudocyclopiidae Sars G.O., 1902 (1)
- Family Rhincalanidae Geletin, 1976 (2)
- Family Ryocalanidae Andronov, 1974 (1)
- Family Scolecitrichidae Giesbrecht, 1893 (48)
- Family Spinocalanidae Vervoort, 1951 (12)
- Family Stephidae Sars G.O., 1902 (2)
- Family Subeucalanidae Geletin, 1976 accepted as Eucalanidae Giesbrecht, 1893
- Family Sulcanidae Nicholls, 1945 (1)
- Family Temoridae Giesbrecht, 1893 (2)
- Family Tharybidae Sars G.O., 1902 (3)
- Superorder Podoplea (237)
- Class Hexanauplia accepted as Thecostraca
- Class Malacostraca (1 740)
- Class Tantulocarida (1)
- Class Thecostraca (46)
- Superclass Oligostraca (456)
- Class Maxillopoda
- Subphylum Myriapoda (4)
- 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)
- 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)
