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 (12 687)
- 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)
- 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)
- Order Monhysterida (28)
- Order Plectida (17)
- Order Rhabditida (49)
- Suborder Rhabditida incertae sedis (4)
- Suborder Rhabditina (4)
- Suborder Spirurina (19)
- Infraorder Ascaridomorpha (14)
- Superfamily Ascaridoidea Baird, 1853 (13)
- Family Anisakidae Railliet & Henry, 1912 (10)
- Subfamily Anisakinae Railliet & Henry, 1912 (3)
- Subfamily Contracaecinae Mozgovoi & Shakhmatova, 1971 (6)
- Genus Contracaecum Railliet & Henry, 1912 (6)
- Species Contracaecum antarcticum Johnston, 1937 accepted as Contracaecum osculatum (Rudolphi, 1802) Baylis, 1920
- Species Contracaecum falcigerum (Railliet & Henry, 1907) Baylis, 1920 accepted as Contracaecum radiatum (Linstow, 1907) Baylis, 1920
- Species Contracaecum himeu Yamaguti, 1941
- Species Contracaecum mirounga Nikolskij, 1974
- Species Contracaecum osculatum (Rudolphi, 1802) Baylis, 1920
- Species Contracaecum radiatum (Linstow, 1907) Baylis, 1920
- Species Contracaecum rudolphii Hartwich, 1964
- Species Contracaecum spiculigerum (Rudolphi, 1809) Railliet & Henry, 1912 accepted as Contracaecum rudolphii Hartwich, 1964
- Species Contracaecum umiu Yamaguti, 1941
- Genus Phocascaris Höst, 1932
- Genus Phocanema Myers, 1959 (1)
- Family Ascarididae Baird, 1853
- Family Raphidascarididae Hartwich, 1954 (3)
- Superfamily Seuratoidea Hall, 1916 (1)
- Infraorder Spiruromorpha (5)
- Suborder Tylenchina (22)
- 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)
