Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
The last expanded taxon is highlighted
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- Biota (12 685)
- Kingdom Animalia (9 791)
- Phylum Acanthocephala (30)
- Phylum Annelida (617)
- Phylum Arthropoda (4 265)
- 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)
- Class Chromadorea (234)
- Subclass Chromadoria (234)
- Order Aphelenchida accepted as Aphelenchoidea Fuchs, 1937
- Order Araeolaimida (33)
- Order Ascaridida accepted as Ascaridomorpha
- Order Chromadorida (44)
- Order Desmodorida (43)
- Order Desmoscolecida (20)
- Suborder Desmoscolecina (20)
- Superfamily Desmoscolecoidea Shipley, 1896 (20)
- Family Cyartonematidae Tchesunov, 1989
- Family Desmoscolecidae Shipley, 1896 (20)
- Subfamily Desmoscolecinae (10)
- Tribe Desmoscolecini Shipley, 1896 (10)
- Subfamily Tricominae Lorenzen, 1969 (9)
- Tribe Greeffiellini Filipjev, 1929 (1)
- Genus Quadricoma Filipjev, 1922 accepted as Tricoma (Quadricoma) (Filipjev, 1922)
- Family Meyliidae De Coninck, 1965
- Order Monhysterida (28)
- Order Plectida (17)
- Order Rhabditida (49)
- Order Spirurida accepted as Rhabditida
- Order Strongylida accepted as Rhabditida
- Order Tylenchida accepted as Tylenchomorpha
- Class Enoplea (162)
- Class Secernentea
- 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)
