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)
- Class Enoplea (162)
- Subclass Dorylaimia (22)
- Subclass Enoplia (140)
- Order Enoplida (138)
- Suborder Alaimina (1)
- Suborder Enoplina (44)
- Suborder Ironina (36)
- Superfamily Ironoidea de Man, 1876 (36)
- Family Leptosomatidae Filipjev, 1916 (33)
- Subfamily Deontostomatinae Belogurov & Fadeeva, 1985 (5)
- Subfamily Leptosomatinae Filipjev, 1916 (10)
- Genus Leptosomatides Filipjev, 1918 (3)
- Genus Leptosomatum Bastian, 1865 (5)
- Species Leptosomatum antarcticum von Linstow, 1892 accepted as Deontostoma antarcticum (von Linstow, 1892) Filipjev, 1916
- Species Leptosomatum arcticum Filipjev, 1916 accepted as Leptosomatides arcticus (Filipjev, 1916)
- Species Leptosomatum bacillatum (Eberth, 1863) Bastian, 1865 accepted as Leptosomatum sabangense Steiner, 1915
- Species Leptosomatum clavatum Platonova, 1958
- Species Leptosomatum crassicutis Platonova, 1958
- Species Leptosomatum elongatum Bastian, 1865 accepted as Leptosomatum gracile Bastian, 1865
- Species Leptosomatum gracile Bastian, 1865
- Species Leptosomatum kerguelense Platonova, 1958
- Species Leptosomatum sabangense Steiner, 1915
- Genus Paraleptosomatides Mawson, 1956 (2)
- Subfamily Platycominae Platonova, 1976 (2)
- Subfamily Synonchinae Platonova, 1970 (1)
- Subfamily Thoracostomatinae De Coninck, 1965 (15)
- Family Leptosomatidae incertae sedis (1)
- Family Oxystominidae Chitwood, 1935 (2)
- Suborder Oncholaimina (55)
- Suborder Trefusiina (2)
- Suborder Tripyloidina
- Order Triplonchida (2)
- 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)
