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)
- Class Hexanauplia accepted as Thecostraca
- Class Malacostraca (1 740)
- Subclass Eumalacostraca (1 732)
- Superorder Eucarida (72)
- Superorder Peracarida (1 660)
- Order Amphipoda (962)
- Order Cumacea (92)
- Order Isopoda (403)
- Suborder Anthuridea accepted as Anthuroidea Lilljeborg, 1864
- Suborder Asellota (225)
- Superfamily Asellota incertae sedis (2)
- Superfamily Janiroidea G. O. Sars, 1897 (218)
- Family Acanthaspidiidae Menzies, 1962 (18)
- Family Dendrotiidae Nordenstam, 1933 accepted as Dendrotionidae Vanhöffen, 1914
- Family Dendrotionidae Vanhöffen, 1914 (1)
- Genus Acanthomunna Beddard, 1886 (1)
- Species Acanthomunna spinipes (Vanhöffen, 1914)
- Family Desmosomatidae G. O. Sars, 1897 (10)
- Family Eurycopidae Hansen, 1916 accepted as Eurycopinae Hansen, 1916
- Family Haploniscidae Hansen, 1916 (17)
- Family Ilyarachnidae Hansen, 1916 accepted as Ilyarachninae Hansen, 1916
- Family Ischnomesidae Hansen, 1916 (5)
- Family Janiridae G. O. Sars, 1897 (14)
- Family Janiroidea incertae sedis
- Family Joeropsidae Nordenstam, 1933 accepted as Joeropsididae Nordenstam, 1933
- Family Joeropsididae Nordenstam, 1933 (3)
- Family Katianiridae Svavarsson, 1987 (1)
- Family Macrostylidae Hansen, 1916 (2)
- Family Mesosignidae Schultz, 1969 (4)
- Family Munnidae G. O. Sars, 1897 (21)
- Family Munnopsidae Lilljeborg, 1864 (80)
- Family Nannoniscidae Hansen, 1916 (7)
- Family Paramunnidae Vanhöffen, 1914 (28)
- Family Pleurocopidae Fresi & Schiecke, 1972
- Family Santiidae Kussakin, 1988 (7)
- Superfamily Stenetrioidea Hansen, 1905 (5)
- Suborder Cymothoida (37)
- Suborder Epicaridea (14)
- Suborder Flabellifera
- Suborder Gnathiidea accepted as Gnathiidae Leach, 1814
- Suborder Limnoriidea (2)
- Suborder Oniscidea (2)
- Suborder Sphaeromatidea (46)
- Suborder Valvifera (77)
- Order Lophogastrida (8)
- Order Mysida (56)
- Order Mysidacea accepted as Mysida
- Order Tanaidacea (139)
- Subclass Phyllocarida (8)
- 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)
