Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Subphylum Chelicerata
- Subphylum Crustacea
- Class Branchiopoda
- Class Cephalocarida
- Class Crustacea (awaiting allocation)
- Class Crustacea incertae sedis
- Class Ichthyostraca
- Class Malacostraca
- Class Maxillopoda
- Subclass Facetotecta
- Subclass Pentastomida
- Subclass Tantulocarida
- Superorder Thoracica
- Order Akentrogonida
- Order Apoda accepted as Isopoda
- Order Apygophora
- Order Arguloida
- Order Calanoida
- Order Canuelloida
- Order Cirripedia (awaiting allocation)
- Order Cirripedia incertae sedis
- Order Copepoda (awaiting allocation)
- Order Cyclopoida
- Order Darwinida accepted as Isopoda
- Order Dendrogastrida
- Order Gelyelloida
- Order Harpacticoida
- Order Ibliformes
- Order Kentrogonida
- Order Laurida
- Order Lernaeopodida
- Order Maxillopoda (awaiting allocation)
- Order Misophrioida
- Order Monstrilloida
- Order Mormonilloida
- Order Mystacocaridida
- Order Orstenocarida
- Order Pedunculata
- Order Pentastomida (awaiting allocation)
- Order Pentastomida incertae sedis
- Order Platycopioida
- Order Poecilostomatoida
- Order Pygophora
- Order Rhizocephala (awaiting allocation)
- Order Scalpelliformes
- Order Sessilia
- Order Siphonostomatoida
- Family Amaterasidae Izawa, 2008 accepted as Pandaridae Milne Edwards, 1840
- Family Archidactylinidae Dana, 1853
- Family Artotrogidae Brady, 1880
- Family Ascomyzontidae Thorell, 1859 accepted as Asterocheridae Giesbrecht, 1899
- Family Asterocheridae Giesbrecht, 1899
- Genus Acontiophorus Brady, 1880
- Genus Ascomyzon Thorell, 1859 accepted as Asterocheres Boeck, 1859
- Genus Asterochaeres Thorell, 1860 accepted as Asterocheres Boeck, 1859
- Genus Asterocheres Boeck, 1859
- Genus Asterocheroides Malt, 1991
- Genus Asteroclieres
- Genus Asteroponrius
- Genus Asteropontella Stock, 1989
- Genus Asteropontius Thompson & Scott in Herdman, 1903
- Genus Asteropontoides Stock, 1975
- Genus Asteropontopsis Stock, 1987
- Genus Australomyzon Nicholls, 1944
- Genus Bythocheres Humes, 1988
- Genus Caecidomyzon Stock, 1981 accepted as Cecidomyzon Stock, 1981
- Genus Cecidomyzon Stock, 1981
- Genus Cephalocheres Kim, 2010
- Genus Chelacheres Stock & Humes, 1995
- Genus Cheramomyzon Humes, 1989
- Genus Cherarnomyzon
- Genus Clausomyzon Giesbrecht, 1895 accepted as Collocheres Canu, 1893
- Genus Cletopontius Thompson & Scott in Herdman, 1903
- Genus Collocheres Canu, 1893
- Genus Collocherides Stock, 1971
- Genus Cyclocheres Kim, 2010
- Genus Cyclopicera Brady, 1872 accepted as Asterocheres Boeck, 1859
- Genus Cystoinyzon
- Genus Cystomyzon Stock, 1981
- Genus Dermatomyzon Claus, 1889
- Genus Discopontius Nicholls, 1944
- Genus Doropontius Thompson & Scott in Herdman, 1903
- Genus Echinocheres Claus, 1889 accepted as Asterocheres Boeck, 1859
- Genus Echinocheres Hansen, 1902 accepted as Calverocheres Wilson, 1932
- Genus Gascardama Kim, 2010
- Genus Gerulusosacculus Ivanenko & Defaye, 2004
- Genus Glyptocheres Humes, 1987
- Genus Gomumucheres Humes, 1996
- Genus Hammatimyzon Stock, 1981
- Genus Hermacheres Stock, 1987
- Genus Hetairosyna Humes, 1991
- Genus Hetairosynella Kim, 2010
- Genus Hetairosynopsis Humes, 1996
- Genus Humescheres Kim, 2005
- Genus Humesimyzon Kim, 2010
- Genus Indomyzon Ummerkutty, 1966
- Genus Inermocheres Boxshall, 1990
- Genus Isopodius Krichagin, 1873 accepted as Asterocheres Boeck, 1859
- Genus Kolocheres Johnsson, 1999
- Genus Kolomyzon Johnsson, 1997 accepted as Kolocheres Johnsson, 1999
- Genus Laperocheres Ivanenko, 1998
- Genus Leptomyzon G.O. Sars, 1915 accepted as Collocheres Canu, 1893
- Genus Lernaeomyzon Nordmann, 1832 accepted as Collocheres Canu, 1893
- Genus Madacheres Humes, 1996 accepted as Asterocheres Boeck, 1859
- Genus Meandromyzon Stock, 1989
- Genus Mesocheres Norman & Scott, 1905
- Genus Mimacheres Leigh-Sharpe, 1934
- Genus Monocheres Stock, 1966
- Genus Neoasterocheres Canário, Da Rocha, Neves & Johnsson, 2017
- Genus Obesiella Ridewood, 1903
- Genus Oedomyzon Stock, 1981
- Genus Onychocheres Stock & Gooding, 1986
- Genus Ophiurocheres Humes, 1998
- Genus Orecturus Humes, 1992
- Genus Paracontiophorus Eiselt, 1961
- Genus Parasterocheres Humes, 1996
- Genus Parasteropontius Johnsson, 1999
- Genus Paurocheres Lee & Kim, 2018
- Genus Peltomyzon Stock, 1975
- Genus Phyllocheres Humes, 1996
- Genus Platymyzon Lee & Kim, 2018
- Genus Psilomyzon Stock, 1965
- Genus Rhynchomyzon Giesbrecht, 1895
- Genus Scottocheres Giesbrecht, 1897
- Genus Selenodiscus Brady, 1910
- Genus Setacheres Johnsson, Bahia & Neves, 2016
- Genus Sinopontius Boxshall, 1990
- Genus Siphonopontius Malt, 1991
- Genus Solenostoma Brady & Robertson, 1873 accepted as Acontiophorus Brady, 1880
- Genus Stenomyzon Kim, 2010
- Genus Stockmyzon Bandera & Huys, 2008
- Species Stockmyzon crassus (Stock, 1966)
- Species Stockmyzon mucronipes (Stock, 1960)
- Genus Thermocheres Kim, 2010
- Genus Tuphacheres Stock, 1965
- Genus Tychomyzon Humes, 1991
- Genus Uperogcos Hesse, 1867
- Family Brychiopontiidae Humes, 1974
- Family Caligidae Burmeister, 1835
- Family Calverocheridae Stock, 1968
- Family Calvocheridae Stock, 1968 accepted as Calverocheridae Stock, 1968
- Family Cancerillidae Giesbrecht, 1897
- Family Cecropidae Dana, 1852 accepted as Pandaridae Milne Edwards, 1840
- Family Choniostomatidae Hansen, 1886 accepted as Nicothoidae Dana, 1852
- Family Codobidae Boxshall & Ohtsuka, 2001
- Family Coralliomyzontidae Humes & Stock, 1991
- Family Dichelesthiidae Milne Edwards, 1840
- Family Dichelinidae Boxshall & Ohtsuka, 2001
- Family Dinopontiidae Murnane, 1967
- Family Dirivultidae Humes & Dojiri, 1980
- Family Dissonidae Yamaguti, 1963
- Family Dyspontiidae accepted as Artotrogidae Brady, 1880
- Family Ecbathyriontidae Humes, 1987
- Family Entomolepidae Brady, 1899 accepted as Entomolepididae Brady, 1899
- Family Entomolepididae Brady, 1899
- Family Eudactylinidae C.B. Wilson, 1932
- Family Euryphoridae C.B. Wilson, 1905 accepted as Caligidae Burmeister, 1835
- Family Hatschekiidae Kabata, 1979
- Family Hyponeoidae Heegaard, 1962
- Family Kroyeriidae Kabata, 1979
- Family Lernaeopodidae Milne Edwards, 1840
- Family Lernanthropidae Kabata, 1979
- Family Megapontiidae Heptner, 1968
- Family Micropontiidae Gooding, 1957
- Family Nanaspididae Humes & Cressey, 1959
- Family Naobranchiidae Yamaguti, 1939 accepted as Lernaeopodidae Milne Edwards, 1840
- Family Nicothoidae Dana, 1852
- Family Pachynesthidae Hesse, 1878 accepted as Siphonostomatoida incertae sedis
- Family Pandaridae Milne Edwards, 1840
- Family Pennellidae Burmeister, 1835
- Family Pennillidae Burmeister, 1816 accepted as Pennellidae Burmeister, 1835
- Family Pontoeciellidae Giesbrecht, 1895
- Family Pontopsyllidae T. Scott, 1894 accepted as Pennellidae Burmeister, 1835
- Family Pseudocycnidae C.B. Wilson, 1922
- Family Pseudohatschekiidae Tang, Izawa, Uyeno & Nagasawa, 2010
- Family Rataniidae Giesbrecht, 1897
- Family Samarusidae Lee & Kim, 2018
- Family Scottomyzontidae Ivanenko, Ferrari & Smurov, 2001
- Family Siphonostomatoida (awaiting allocation)
- Family Siphonostomatoida incertae sedis
- Family Sphyriidae C.B. Wilson, 1919
- Family Sponginticolidae Topsent, 1928
- Family Spongiocnizontidae Stock & Kleeton, 1964
- Family Stellicomitidae Humes & Cressey, 1958
- Family Tanypleuridae Kabata, 1969
- Family Trebiidae C.B. Wilson, 1905
- Order Skaracarida †
- Class Ostracoda
- Class Remipedia
- Order Cyclida †
- Genus Anatifera Meuschen, 1787
- Genus Dickinsonia Tasch, 1963 † accepted as Elmocephalus Tasch, 1964 †
- Genus Elmocephalus Tasch, 1964 †
- Subphylum Hexapoda
- Subphylum Myriapoda
- Subphylum Trilobitomorpha †
- Class Arachnomorpha (awaiting allocation)
- Class Arthropoda (awaiting allocation)
- Class Artiopoda †
- Class Crustaceomorpha incertae sedis †
- Class Dinocaridida †
- Class Labrophora incertae sedis
- Class Lamellipedia incertae sedis
- Class Megacheira †
- Class Thylacocephala †
- Class Xenocarida incertae sedis
- Order Canadaspidida † accepted as Hymenocarina †
- Order Cheloniellida †
- Order Emeraldellida † accepted as Arthropoda
- Order Fuxianhuiida †
- Order Habeliida †
- Order Hymenocarina †
- Order Isoxyida †
- Order Pectocaridida † accepted as Hymenocarina †
- Order Waptiida † accepted as Hymenocarina †
- Family Bomakellidae Fedonkin, 1987 †
- Family Burgessiidae Walcott, 1912 †
- Family Emeraldellidae Raymond, 1935 †
- Family Guangweicarididae Luo, Fu, Hu, Li, Hou, You, Pang & Liu, 2007 †
- Genus Aaveqaspis Peel & Stein, 2009 †
- Genus Acheronauta Pulsipher, Anderson, Wright, Kluessendorf, Mikulic & Schiffbauer, 2022 †
- Genus Arthroaspis Stein, Budd, Peel & Harper, 2013 †
- Genus Astutuscaris Jiao & Du, 2022 †
- Genus Bennettarthra Fayers, Trewin & Morrissey, 2010 †
- Genus Bushizheia O'Flynn & Liu in O'Flynn et al., 2020 †
- Genus Chuandianella Hou & Bergström, 1991 †
- Genus Dioxycaris Gürich, 1929 †
- Genus Dongshanocaris Hou, Bergström, Wang, Feng & Chen, 1999 †
- Genus Duraznovis Lara, Cariglino & Zavattieri in Lara et al., 2019 †
- Genus Duraznovs Lara, Cariglino & Zavattieri in Lara et al., 2019 † accepted as Duraznovis Lara, Cariglino & Zavattieri in Lara et al., 2019 †
- Genus Esmeraldacaris Waggoner, 2003 †
- Genus Fibulacaris Izquierdo-López & Caron, 2019 †
- Genus Kiisortoqia Stein, 2010 †
- Genus Kylinxia Zeng, Zhao, Niu, Zhu & Huang, 2020 †
- Genus Lihuacaris Jiao, Pates, Lerosey-Aubril, Ortega-Hernández, Yang, Lan & Zhang, 2021 †
- Genus Norikeya Tanaka, Siveter & Williams, 2013 †
- Genus Nothozoe Barrande, 1872 †
- Genus Nothozoe Barrande in Bigsby, 1868 † accepted as Nothozoe Barrande, 1872 †
- Genus Notozoe Zittel, 1885 † accepted as Nothozoe Barrande, 1872 †
- Genus Pakucaris Izquierdo-López & Caron, 2021 †
- Genus Pambdelurion Budd, 1998 †
- Genus Parvibellus Liu, Dunlop, Steiner & Shu, 2022 †
- Genus Pleuralata McCoy, Strother & Briggs, 2012 †
- Genus Pseudoangustidontus Van Roy & Tetlie, 2006 †
- Genus Pteroessa Hudson & Gosse, 1886
- Genus Sidneyia Walcott, 1911 †
- Genus Siriocaris Lagebro, Stein & Peel, 2009 †
- Genus Vermontcaris Pari, Briggs & Gaines, 2022 †
- Genus Youti Smith, Long, Dhungana, Dobson, Yang & Zhang, 2024 †
- 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
- 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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