Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Class Adenophorea
- Class Aphasmida
- Class Chromadorea
- Class Dorylaimea
- Class Enoplea
- Order Alaimida
- Order Enoplida
- Order Ironida
- Family Andrassyidae Tchesunov & Gagarin, 1999
- Family Campgdoridae accepted as Campydoridae Clark, 1961
- Family Campydoridae Clark, 1961
- Family Ironidae de Man, 1876
- Family Leptosomatidae Filipjev, 1916
- Genus Anivanema Platonova, 1976
- Genus Barbonema Filipjev, 1927
- Genus Bongersia Platonova, 1988
- Genus Corythostoma
- Genus Cyclicolaimus accepted as Cylicolaimus de Man, 1889
- Genus Cylicolaimus de Man, 1889
- Genus Dactylonema Filipjev, 1927 accepted as Platycomopsis Ditlevsen, 1926
- Genus Deontostoma Filipjev, 1916
- Genus Donostoma
- Genus Eusynonchus Platonova, 1970
- Genus Fiacra Southern, 1914 accepted as Synonchus Cobb, 1894
- Genus Hemipsilus de Quatrefages, 1846 accepted as Thoracostoma Marion, 1870
- Genus Jaegerskioeldia Filipjev, 1916 accepted as Synonchus Cobb, 1894
- Genus Leptosomatides Filipjev, 1918
- Genus Leptosomatina Allgén, 1951
- Genus Leptosomatum Bastian, 1865
- Genus Leptosomella Filipjev, 1927
- Genus Macronchus Inglis, 1964
- Genus Metacylicolaimus Schuurmans Stekhoven, 1946
- Genus Nudolaimus Allgén, 1929 accepted as Cylicolaimus de Man, 1889
- Genus Orthophallonema Bongers, 1983
- Genus Parabarbonema Inglis, 1964
- Genus Paracylicolaimus Platonova, 1970
- Genus Paraleptosomatides Mawson, 1956
- Genus Paratuerkiana Platonova, 1970
- Genus Phanoglene Nordmann in Lamarck, 1840
- Genus Pilosinema Platonova, 1976
- Genus Platonova Mordukhovich, Semenchenko, Fadeeva & Zograf, 2019
- Genus Platycoma Cobb, 1894
- Genus Platycomopsis Ditlevsen, 1926
- Genus Proplatycoma Platonova, 1976
- Genus Pseudocella Filipjev, 1927
- Genus Pseudotriceratonema Belogurov & Fadeeva, 1985
- Genus Ritenbenkia Allgén, 1957
- Genus Sadkonavis Platonova, 1979
- Genus Synonchoides
- Genus Synonchus Cobb, 1894
- Genus Syringonomus Hope & Murphy, 1969
- Genus Tapia Belogurov & Fadeeva, 1985
- Genus Thauracostoma Saint-Joseph, 1894 accepted as Thoracostoma Marion, 1870
- Genus Thoracostoma Marion, 1870
- Genus Triaulolaimus Platonova, 1979
- Genus Triceratonema Platonova, 1976
- Genus Tuerkiana Platonova, 1970
- Genus Turbolaimella
- Family Oxystominidae Filipjev, 1918
- Family Paroxystominidae accepted as Oxystominidae Filipjev, 1918
- Family Rhabdolaimidae Chitwood, 1951
- Order Oncholaimida
- Order Rhaptothyreida
- Order Trefusiida
- Order Triplonchida
- Order Tripylida
- Order Tripyloidida
- Class Nematoda (awaiting allocation)
- Class Nematoda incertae sedis
- Class Rhabditea
- Class Secernentea
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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