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
4 Click on "+" to expand/show all child taxa
5 Click to see the taxon details page
- 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
- Order Bathyodontida
- Order Dioctophymatida
- Order Dorylaimida
- Family Actinolaimidae Thorne, 1939
- Family Aetholaimidae Jairajpuri, 1965
- Family Aporcelaimidae Heyns, 1965
- Family Arctidorylaimidae Mulvey & Anderson, 1979 accepted as Dorylaimidae de Man, 1876
- Family Aulolaimoididae Jairajpuri, 1964
- Family Axonchiidae Thorne, 1964 accepted as Belondiridae Thorne, 1939
- Family Basirotyleptidae Siddiqi & Khan, 1964 accepted as Leptonchidae Thorne, 1935
- Family Belondiridae Thorne, 1939
- Family Belonenchidae Thorne, 1964 accepted as Leptonchidae Thorne, 1935
- Family Brittonematidae Thorne, 1967 accepted as Actinolaimidae Thorne, 1939
- Family Carcharolaimidae Thorne, 1967
- Family Chrysonematidae Siddiqi, 1969 accepted as Qudsianematidae Jairajpuri, 1965
- Family Crateronematidae Siddiqi, 1969 accepted as Qudsianematidae Jairajpuri, 1965
- Family Discolaimidae Siddiqi, 1969 accepted as Qudsianematidae Jairajpuri, 1965
- Family Dorylaimellidae Jairajpuri, 1964 accepted as Belondiridae Thorne, 1939
- Family Dorylaimidae de Man, 1876
- Family Dorylaimoidea incertae sedis
- Family Dorylaimoididae Siddiqi, 1969 accepted as Mydonomidae Thorne, 1964
- Family Encholaimidae Golden & Murphy, 1967 accepted as Leptonchidae Thorne, 1935
- Family Falcihastidae Siddiqi, 1968 accepted as Belondiridae Thorne, 1939
- Family Kochinematidae Darekar & Khan, 1979 accepted as Nordiidae Siddiqi, 1969
- Family Leptonchidae Thorne, 1935
- Family Longidoridae Thorne, 1935
- Family Miranematidae Siddiqi, 1969 accepted as Mydonomidae Thorne, 1964
- Family Mydonomidae Thorne, 1964
- Family Neoactinolaimidae Thorne, 1967 accepted as Actinolaimidae Thorne, 1939
- Family Nordiidae Siddiqi, 1969
- Family Nygellidae Andrássy, 1958
- Family Nygolaimellidae Clark, 1961
- Family Nygolaimidae Thorne, 1935
- Family Opailaimidae accepted as Belondiridae Thorne, 1939
- Family Oxydiridae Thorne, 1964 accepted as Belondiridae Thorne, 1939
- Family Paractinolaimidae Thorne, 1967 accepted as Actinolaimidae Thorne, 1939
- Family Pararhyssocolpidae Elshishka, Lazarova, Radoslavov, Hristov & Peneva, 2015
- Family Paraxonchiidae Dhanachand & Jairajpuri, 1981
- Family Prodorylaimidae Andrássy, 1969 accepted as Dorylaimidae de Man, 1876
- Family Pungentidae Monteiro, 1970 accepted as Nordiidae Siddiqi, 1969
- Family Quadsianematidae accepted as Qudsianematidae Jairajpuri, 1965
- Family Qudsianematidae Jairajpuri, 1965
- Family Roqueidae Thorne, 1964 accepted as Belondiridae Thorne, 1939
- Family Swangeriidae Jairajpuri, 1964 accepted as Belondiridae Thorne, 1939
- Family Thornenematidae Siddiqi, 1969
- Family Thorniidae De Coninck, 1965 accepted as Qudsianematidae Jairajpuri, 1965
- Family Trachypleurosidae Thorne, 1967
- Family Tylencholaimellidae Jairajpuri, 1964
- Family Tylencholaimidae Filipjev, 1934
- Genus Amphitylencholaimus Jairajpuri & Ahmad, 1992 accepted as Tylencholaimus de Man, 1876
- Genus Botalium Heyns, 1963 accepted as Xiphinemella Loos, 1950
- Genus Bullaenema Sauer, 1967 † accepted as Bullanema Sauer, 1968
- Genus Bullanema Sauer, 1968
- Genus Chitwoodielloides Ahmad & Araki, 2003
- Genus Chitwoodiellus Jiménez-Guirado & Pena Santiago, 1992
- Genus Chitwoodius Furstenberg & Heyns, 1966
- Genus Clavigula Siddiqi, 1995
- Genus Curvidorylaimus Jairajpuri & Rahman, 1982
- Genus Disctylencholaimus Jairajpuri & Ahmad, 1992 accepted as Tylencholaimus de Man, 1876
- Genus Heynsnema Peña-Santiago, Guerrero & Ciobanu, 2008
- Genus Kantbhala Siddiqi, 1981
- Genus Lawtonema Siddiqi, 1999
- Genus Leptonchulus Chawla, Bhamburkar, Khan & Prasad, 1968 accepted as Meylonema Andrássy, 1960
- Genus Leptotylencholaimus Jairajpuri & Ahmad, 1992 accepted as Tylencholaimus de Man, 1876
- Genus Metadorylaimus Jairajpuri & Goodey, 1966
- Genus Meylis
- Genus Mumtazium Siddiqi, 1969 †
- Genus Neometadorylaimus Jairajpuri & Ahmad, 1992
- Genus Oostenbrinkellus Islam & Ahmad, 2024
- Genus Opisthotylencholaimus Jairajpuri & Ahmad, 1992 accepted as Tylencholaimus de Man, 1876
- Genus Promumtazium Siddiqi, 1982
- Genus Protylencholaimus Jairajpuri & Ahmad, 1992 accepted as Tylencholaimus de Man, 1876
- Genus Pseudotylencholaimus Jairajpuri & Ahmad, 1992 accepted as Tylencholaimus de Man, 1876
- Genus Rostrulium Siddiqi, 1995
- Genus Sclerolaimus Jairajpuri & Ahmad, 1992
- Genus Siddiqius Andrassy, 1976 † accepted as Utahnema Thorne, 1939
- Genus Tahamina Islam & Ahmad, 2023
- Genus Tantunema Siddiqi, 1982
- Genus Tsukubanema Ahmad & Araki, 2002
- Genus Tylenchodoroides Gagarin, 2001
- Genus Tylenchodorus Gagarin, 1999 accepted as Tylenchodoroides Gagarin, 2001
- Genus Tylencholaimus de Man, 1876
- Genus Vanderlindia Heyns, 1964
- Genus Wasimellus Bloemers & Wanless, 1996
- Genus Xenonchium Siddiqi & Khan, 1964 accepted as Tylencholaimus de Man, 1876
- Genus Zalophidera Siddiqi, 1982
- Family Tyleptidae Monteiro, 1970 accepted as Leptonchidae Thorne, 1935
- Family Xiphinematidae Dalmasso, 1969
- Order Isolaimida accepted as Mermithida
- Order Marimermithida
- Order Mermithida
- Order Mononchida
- Order Muspiceida
- Order Trichocephalida
- Class Enoplea
- 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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