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
- Family Abrsiidae Karanovic, 2008
- Family Anchimolgidae Humes & Boxshall, 1996
- Family Anomoclausiidae Gotto, 1964
- Family Antheacheridae M. Sars, 1870
- Family Anthessiidae Humes, 1986
- Family Archinotodelphyidae Lang, 1949
- Family Ascidicolidae Thorell, 1859
- Family Bomolochidae Claus, 1875
- Family Botryllophilidae G.O. Sars, 1921
- Family Bradophilidae Marchenkov, 2002
- Family Bradyophilidae
- Family Buproridae Thorell, 1859
- Family Catiniidae Bocquet & Stock, 1957
- Family Catlaphilidae Tripathi, 1960 accepted as Lernaeidae Cobbold, 1879
- Family Chitonophilidae Avdeev & Sirenko, 1991
- Family Chondracanthidae Milne Edwards, 1840
- Family Chordeumiidae Boxshall, 1988
- Family Choreftriidae Uyeno, 2022
- Family Clausidiidae Embleton, 1901
- Family Clausiidae Giesbrecht, 1895
- Family Corallovexiidae Stock, 1975
- Family Corycaeidae Dana, 1852
- Family Cucumaricolidae Bouligand & Delamare-Deboutteville, 1959
- Family Cyclopettidae Martínez Arbizu, 2000
- Family Cyclopicinidae G.O. Sars, 1913 accepted as Cyclopinidae G.O. Sars, 1913
- Family Cyclopicinidae Khodami, McArthur, Blanco-Bercial & Martinez Arbizu, 2017
- Family Cyclopidae Rafinesque, 1815
- Family Cyclopinidae G.O. Sars, 1913
- Family Cyclopoida (awaiting allocation)
- Family Cyclopoida incertae sedis
- Family Cyclopoidea (awaiting allocation)
- Family Doropygidae Brady, 1878 accepted as Notodelphyidae Dana, 1853
- Family Echiurophilidae Delamare-Deboutteville & Nunes-Ruivo, 1955
- Family Enterocolidae Della Valle, 1883 accepted as Enteropsidae Thorell, 1859
- Family Enterognathidae Illg & Dudley, 1980
- Family Enteropsidae Thorell, 1859
- Family Entobiidae Ho, 1984
- Family Erebonasteridae Humes, 1987
- Family Ergasilidae Burmeister, 1835
- Family Eunicicolidae G.O. Sars, 1918
- Family Fratiidae Ho, Conradi & López-González, 1998
- Family Gastrodelphyidae List, 1889
- Family Giselinidae Martínez Arbizu, 2000
- Family Grandiunguidae
- Family Haplostomidae G.O. Sars, 1921 accepted as Botryllophilidae G.O. Sars, 1921
- Family Hemicyclopinidae Martínez Arbizu, 2001
- Family Herpyllobiidae Hansen, 1892
- Family Intramolgidae Marchenkov & Boxshall, 1995
- Family Kelleriidae Humes & Boxshall, 1996
- Family Lamippidae Joliet, 1882
- Family Leaniricolidae Huys, 2016
- Family Lernaeidae Cobbold, 1879
- Family Lernaeosoleidae Hogans & Benz, 1990 accepted as Chondracanthidae Milne Edwards, 1840
- Family Lichomolgidae Kossmann, 1877
- Family Lubbockiidae Giesbrecht, 1892
- Family Macrochironidae Humes & Boxshall, 1996
- Family Makrostrotidae Huys, Fatih, Ohtsuka & Llewellyn-Hughes, 2011
- Family Mantridae Leigh-Sharpe, 1934
- Family Melinnacheridae Lutzen, 1964 accepted as Saccopsidae Lützen, 1964
- Family Mesoglicolidae de Zulueta, 1911
- Family Micrallectidae Huys, 2001
- Family Myicolidae Yamaguti, 1936
- Family Mytilicolidae Bocquet & Stock, 1957
- Family Nereicolidae Claus, 1875
- Family Notodelphyidae Dana, 1853
- Family Nucellicolidae Lamb, Boxshall, Mill & Grahame, 1996 accepted as Chitonophilidae Avdeev & Sirenko, 1991
- Family Octopicolidae Humes & Boxshall, 1996
- Family Oithonidae Dana, 1853
- Family Oncaeidae Giesbrecht, 1893
- Family Ozmanidae Ho & Thatcher, 1989
- Family Paralubbockiidae Boxshall & Huys, 1990
- Family Pharodidae Illg, 1948 accepted as Chondracanthidae Milne Edwards, 1840
- Family Philichthyidae Vogt, 1877
- Family Philoblennidae Izawa, 1976
- Family Pholoicolidae Boxshall, O'Reilly, Sikorski & Summerfield, 2019
- Family Pionodesmotidae Bonnier, 1898
- Family Poecilostomatoida incertae sedis
- Family Polyankylidae
- Family Polyankyliidae Ho & Kim, 1997
- Family Praxillinicolidae Huys, 2016
- Family Psammocyclopinidae Martínez Arbizu, 2001
- Family Pseudanthessiidae Humes & Stock, 1972
- Family Pterinopsyllidae G.O. Sars, 1913
- Family Pteropsyllidae G.O. Sars, 1913 accepted as Pterinopsyllidae G.O. Sars, 1913
- Family Rhynchomolgidae Humes & Stock, 1972
- Family Sabelliphilidae Gurney, 1927
- Family Saccopsidae Lützen, 1964
- Family Sapphirinidae Thorell, 1859
- Family Schminkepinellidae Martínez Arbizu, 2006
- Family Serpulidicolidae Stock, 1979
- Family Shiinoidae Cressey, 1975
- Family Smirnovipinidae Martínez Arbizu, 1997 accepted as Smirnovipinidae Khodami, McArthur, Blanco-Bercial & Martinez Arbizu, 2017
- Family Smirnovipinidae Khodami, McArthur, Blanco-Bercial & Martinez Arbizu, 2017
- Family Speleoithonidae Rocha & Iliffe, 1991
- Family Spiophanicolidae Ho, 1984
- Family Splanchnotrophidae Norman & Scott, 1906
- Family Splanchnotropidae Izawa, 1976 accepted as Splanchnotrophidae Norman & Scott, 1906
- Family Strepidae Cheng, Liu & Dai, 2016
- Family Synapticolidae Humes & Boxshall, 1996
- Family Synaptiphilidae Bocquet & Stock, 1957
- Family Taeniacanthidae C.B. Wilson, 1911
- Genus Anchistrotos Brian, 1906
- Genus Biacanthus Tang & Izawa, 2005
- Genus Caudacanthus Tang & Johnston, 2005
- Genus Cirracanthus Dojiri & Cressey, 1987
- Genus Clavisodalis Humes, 1970
- Genus Clavisodulis
- Genus Echinirus Humes & Cressey, 1961
- Genus Echinosocius Humes & Cressey, 1961
- Genus Haemaphilus Hesse, 1871
- Genus Haematophilus Wilson, 1924 accepted as Haemaphilus Hesse, 1871
- Genus Irodes Wilson, 1911
- Genus Metataeniacanthus Pillai, 1963
- Genus Nudisodalis Dojiri & Cressey, 1987
- Genus Parataeniacanthus Yamaguti, 1939 accepted as Taeniacanthus Sumpf, 1871
- Species Parataeniacanthus cynoglossi Rangnekar & Murti, 1962 accepted as Taeniacanthus cynoglossi (Rangnekar & Murti, 1962)
- Species Parataeniacanthus inimici Yamaguti & Yamasu, 1959 accepted as Cirracanthus inimici (Yamaguti & Yamasu, 1959)
- Species Parataeniacanthus longicervis Pillai, 1963 accepted as Taeniacanthus longicervis (Pillai, 1963)
- Species Parataeniacanthus miles Pillai, 1963 accepted as Taeniacanthus miles (Pillai, 1963)
- Species Parataeniacanthus platycephali Yamaguti, 1939 accepted as Taeniacanthus platycephali (Yamaguti, 1939)
- Species Parataeniacanthus pseudorhombi Yamaguti, 1939 accepted as Taeniacanthus pseudorhombi (Yamaguti, 1939)
- Species Parataeniacanthus rotundiceps Shiino, 1957 accepted as Taeniacanthus rotundiceps (Shiino, 1957)
- Species Parataeniacanthus russelli Devi & Shyamasundari, 1980 accepted as Taeniacanthus miles (Pillai, 1963)
- Genus Phagus Wilson, 1911
- Genus Pseudotaeniacanthus Yamaguti & Yamasu, 1959
- Genus Saging Uyeno, Tang & Nagasawa, 2013
- Genus Scolecicara Ho, 1969
- Genus Suncheonacanthus Venmathi Maran, Moon, Adday & Tang, 2016
- Genus Synatiphilus Norman, 1905 accepted as Synaptiphilus Canu & Cuénot, 1892
- Genus Taeniacanthodes Wilson, 1935
- Genus Taeniacanthus Sumpf, 1871
- Genus Taeniastrotos Cressey, 1969
- Genus Triacanthus Kim & Moon, 2013 accepted as Suncheonacanthus Venmathi Maran, Moon, Adday & Tang, 2016
- Genus Tucca Krøyer, 1837
- Genus Umazuracola Ho, Ohtsuka & Nakadachi, 2006
- Family Tegobomolochidae Izawa, 1976 accepted as Bomolochidae Claus, 1875
- Family Telsidae Ho, 1967
- Family Thamnomolgidae Humes & Boxshall, 1996
- Family Thaumatopsyllidae G.O. Sars, 1913
- Family Thespesiopsyllidae C.B. Wilson, 1924 accepted as Thaumatopsyllidae G.O. Sars, 1913
- Family Tuccidae Vervoort, 1962 accepted as Taeniacanthidae C.B. Wilson, 1911
- Family Umazuracolidae Ho, Ohtsuka & Nakadachi, 2006 accepted as Taeniacanthidae C.B. Wilson, 1911
- Family Urocopiidae Humes & Stock, 1972
- Family Vahiniidae Humes, 1967
- Family Vaigamidae Thatcher & Robertson, 1984 accepted as Ergasilidae Burmeister, 1835
- Family Ventriculinidae Leigh-Sharpe, 1934
- Family Xarifiidae Humes, 1960
- Family Xenocoelomatidae Bresciani & Lutzen, 1966
- Family Xenocoelomidae Bresciani & Lutzen, 1966 accepted as Xenocoelomatidae Bresciani & Lutzen, 1966
- 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
- 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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