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
- Family Adenopleurellidae Huys, 1990
- Family Aegisthidae Giesbrecht, 1893
- Family Ambunguipedidae Huys, 1990 accepted as Hamondiidae Huys, 1990
- Family Ameiridae Monard, 1927
- Family Ancorabolidae G.O. Sars, 1909
- Family Arenopontiidae Martínez Arbizu & Moura, 1994
- Family Argestidae Por, 1986
- Family Balaenophilidae G.O. Sars, 1910
- Family Cancrincolidae Fiers, 1990
- Family Canthocamptidae Brady, 1880
- Family Cerviniidae Sars, 1903 accepted as Aegisthidae Giesbrecht, 1893
- Family Chappuisiidae Chappuis, 1940
- Family Cletodidae T. Scott, 1904
- Family Cletopsyllidae Huys & Willems, 1989
- Family Clytemnestridae A. Scott, 1909
- Family Cristacoxidae Huys, 1990
- Family Cylindropsyllidae G.O. Sars, 1909
- Family Dactylopusiidae G.O. Sars, 1905
- Family Danielsseniidae accepted as Pseudotachidiidae Lang, 1936
- Family Darcythompsoniidae Lang, 1936
- Family Diosaccidae G. O. Sars, 1906 accepted as Miraciidae Dana, 1846
- Family Ectinosomatidae G.O. Sars, 1903
- Family Ectinosomidae G.O. Sars, 1903 accepted as Ectinosomatidae G.O. Sars, 1903
- Family Euterpinidae Brian, 1921
- Family Hamondiidae Huys, 1990
- Family Harpacticidae Dana, 1846
- Family Harpacticoida (awaiting allocation)
- Family Harpacticoida incertae sedis
- Family Heteropsyllidae Kornev & Chertoprud, 2008
- Family Huntemanniidae Por, 1986 accepted as Nannopodidae Brady, 1880
- Family Idyaeidae Sars, 1910 accepted as Tisbidae Stebbing, 1910
- Family Idyanthidae Lang, 1948
- Family Ismardiidae Leigh-Sharpe, 1936 accepted as Harpacticidae Dana, 1846
- Family Laophontidae Scott, 1905
- Family Laophontopsidae Huys & Willems, 1989
- Family Latiremidae Bozic, 1969
- Family Leptastacidae Huys, 1992
- Family Leptopontiidae Lang, 1948
- Family Louriniidae Monard, 1927
- Family Metahuntemanniidae Por, 1986 accepted as Canthocamptidae Brady, 1880
- Family Metidae G.O. Sars, 1910
- Family Miracidae accepted as Miraciidae Dana, 1846
- Family Miraciidae Dana, 1846
- Genus Actopsyllus Wells, 1967
- Genus Amonardia Lang, 1944
- Genus Amphiacella Lang, 1944 accepted as Amphiascoides Nicholls, 1941
- Genus Amphiascella Lang, 1944 accepted as Amphiascoides Nicholls, 1941
- Genus Amphiascoides Nicholls, 1941
- Genus Amphiascopsis Gurney, 1927
- Genus Amphiascus G.O. Sars, 1905
- Genus Anisostenhelia Mu & Huys, 2002
- Genus Antiboreodiosaccus Lang, 1944
- Genus Archaeohuysia Gómez, 2021
- Genus Balucopsylla Rao, 1972
- Genus Beatricella Scott, 1905
- Genus Bulbamphiascus Lang, 1944
- Genus Bulbamphiascus Lang, 1948 accepted as Bulbamphiascus Lang, 1944
- Genus Cladorostrata Shen & Tai, 1963 accepted as Cladorostrata Tai & Song, 1979
- Species Cladorostrata brevipoda Shen & Tai, 1963
- Species Cladorostrata longipoda Shen & Tai, 1963
- Genus Cladorostrata Tai & Song, 1979
- Genus Dactylamphiascopsis Lang, 1948 accepted as Dactylopodamphiascopsis Lang, 1944
- Genus Dactylopodamphiascopsis Lang, 1944
- Genus Dactylopodamphiascopsis Lang, 1948 accepted as Dactylopodamphiascopsis Lang, 1944
- Genus Delavalia Brady, 1868
- Genus Diarthropodella Gómez, 2021
- Genus Dinetia Gómez, Corgosinho & Rivera-Sánchez, 2021 accepted as Dinetocaris Gómez, Corgosinho & Rivera-Sánchez, 2021
- Genus Dineticola Gómez, Corgosinho & Rivera-Sánchez, 2021 accepted as Dinetia Gómez, Corgosinho & Rivera-Sánchez, 2021
- Genus Dinetocaris Gómez, Corgosinho & Rivera-Sánchez, 2021
- Genus Diosaccopsis Brian, 1925
- Genus Diosaccus Boeck, 1873
- Genus Distioculus Huys & Böttger-Schnack, 1994
- Genus Dwightia Wilson, 1924 accepted as Macrosetella A. Scott, 1909
- Genus Eoschizopera Wells & Rao, 1976
- Genus Goffinella Wilson, 1932
- Genus Haloschizopera Lang, 1944
- Genus Haloschizopera Lang, 1948 accepted as Haloschizopera Lang, 1944
- Genus Helmutkunzia Wells & Rao, 1976
- Genus Hicksia Mu & Huys, 2002 accepted as Muohuysia Özdikmen, 2009
- Genus Ialysus Brian, 1927
- Genus Itostenhelia Karanovic & Kim, 2014
- Genus Lonchoeidestenhelia Gómez, 2020
- Genus Macrosetella A. Scott, 1909
- Genus Melima Por, 1964
- Genus Mesamphiascus Nicholls, 1941
- Genus Metamphiascopsis Lang, 1944
- Genus Metamphiascopsis Lang, 1948 accepted as Metamphiascopsis Lang, 1944
- Genus Microthalestris G.O. Sars, 1905 accepted as Amonardia Lang, 1944
- Genus Miracia Dana, 1846
- Genus Miscegenus Wells, Hicks & Coull, 1982
- Genus Monardius Huys, 2009
- Genus Muohuysia Özdikmen, 2009
- Genus Neomiscegenus Karanovic & Reddy, 2004
- Genus Neoschizopera Apostolov, 1982
- Genus Oculosetella F. Dahl, 1895
- Genus Onychostenhelia Itô, 1979
- Genus Pallarica Gómez, Corgosinho & Rivera-Sánchez, 2021
- Genus Paradiosaccus Lang, 1944 accepted as Diosaccus Boeck, 1873
- Genus Paradiosaccus Lang, 1948 accepted as Diosaccus Boeck, 1873
- Genus Paramphiascella Lang, 1944
- Genus Paramphiascella Lang, 1948 accepted as Paramphiascella Lang, 1944
- Genus Paramphiascoides Wells, 1967
- Genus Paramphiascopsis Lang, 1944 accepted as Amphiascus G.O. Sars, 1905
- Genus Paramphiascopsis Lang, 1948 accepted as Paramphiascopsis Lang, 1944
- Genus Pararobertsonia Lang, 1944
- Genus Pararobertsonia Lang, 1948 accepted as Pararobertsonia Lang, 1944
- Genus Parialysus Nicholls, 1941
- Genus Pholenota Vervoort, 1964
- Genus Praeoschizopera Apostolov, 1982
- Genus Protoleptastacus Noodt, 1952 accepted as Psammotopa Pennak, 1942
- Genus Protopsammotopa Geddes, 1968
- Genus Psammoschizoperopsis Apostolov, 1982
- Genus Psammotopa Pennak, 1942
- Genus Pseudamphiascopsis Lang, 1944
- Genus Pseudamphiascopsis Lang, 1948 accepted as Pseudamphiascopsis Lang, 1944
- Genus Pseudobalucopsylla Mu & Huys, 2021
- Genus Pseudodiosaccopsis Lang, 1944
- Genus Pseudodiosaccopsis Lang, 1948 accepted as Pseudodiosaccopsis Lang, 1944
- Genus Pseudodiosaccus Scott, 1906
- Genus Pseudostenhelia Wells, 1967
- Genus Rhyncholagena Lang, 1944
- Genus Rhyncholagena Lang, 1948 accepted as Rhyncholagena Lang, 1944
- Genus Robertgurneya Lang, 1948 accepted as Robertgurneya Apostolov & Marinov, 1988
- Genus Robertgurneya Lang, 1944 accepted as Robertgurneya Apostolov & Marinov, 1988
- Genus Robertgurneya Apostolov & Marinov, 1988
- Genus Robertgurneyella Gómez, 2020
- Genus Robertsonia Brady, 1878 accepted as Robertsonia Brady, 1880
- Genus Robertsonia Brady, 1880
- Genus Sarsamphiascus Huys, 2009
- Genus Schizopera G.O. Sars, 1905
- Genus Schizoperoides Por, 1968
- Genus Schizoperopsis Apostolov, 1982 accepted as Schizopera G.O. Sars, 1905
- Genus Setella Dana, 1846 accepted as Macrosetella A. Scott, 1909
- Genus Spinodiosaccus Gómez, Corgosinho & Rivera-Sánchez, 2021
- Genus Spinopedia Gómez, Corgosinho & Rivera-Sánchez, 2021
- Genus Spio Brady & Robertson, 1875 accepted as Delavalia Brady, 1868
- Genus Stenhelia Boeck, 1865
- Genus Teisseriella Apostolov, 1968 accepted as Robertsonia Brady, 1880
- Genus Teissierella Monard, 1935 accepted as Robertsonia Brady, 1880
- Genus Tydemanella A. Scott, 1909
- Genus Typhlamphiascus Lang, 1944
- Genus Typhlamphiascus Lang, 1948 accepted as Typhlamphiascus Lang, 1944
- Genus Varnaia Klie, 1937 accepted as Robertsonia Brady, 1880
- Genus Wellstenhelia Karanovic & Kim, 2014
- Genus Wellstenvalia Gómez & Cruz-Barraza, 2021
- Genus Willenstenhelia Karanovic & Kim, 2014
- Family Nannopodidae Brady, 1880
- Family Neobradyidae Olofsson, 1917
- Family Normanellidae Huys & Willems, 1989
- Family Novocriniidae Huys & Iliffe, 1998
- Family Orthopsyllidae Huys, 1990
- Family Parameiropsidae Corgosinho & Martínez Arbizu, 2010
- Family Paramesochridae Lang, 1944
- Family Paranannopidae Por, 1986 accepted as Pseudotachidiidae Lang, 1936
- Family Parastenheliidae Lang, 1936
- Family Parastenocarididae Chappuis, 1933
- Family Parastentheliidae Lang, 1936 accepted as Parastenheliidae Lang, 1936
- Family Peltidiidae G.O. Sars, 1904
- Family Phyllognathopodidae Gurney, 1932
- Family Porcellidiidae G.O. Sars, 1904
- Family Protolatiremidae Bozic, 1969
- Family Psammopsyllidae accepted as Leptopontiidae Lang, 1948
- Family Pseudopeltidiidae Poppe, 1891 accepted as Clytemnestridae A. Scott, 1909
- Family Pseudotachidiidae Lang, 1936
- Family Rhizothricidae Por, 1986 accepted as Rhizotrichidae Por, 1986
- Family Rhizotrichidae Por, 1986
- Family Rhynchothalestridae Lang, 1948 accepted as Thalestridae G.O. Sars, 1905
- Family Rometidae Seifried & Schminke, 2003
- Family Rotundiclipeidae Huys, 1988
- Family Styracothoracidae Huys, 1993 accepted as Idyanthidae Lang, 1948
- Family Superornatiremidae Huys, 1991
- Family Tachidiidae G.O. Sars, 1909
- Family Tegastidae G.O. Sars, 1904
- Family Tetragonicepsidae Lang, 1944
- Family Tetragonicipitidae Lang, 1944
- Family Thalestridae G.O. Sars, 1905
- Family Thompsonulidae Lang, 1944
- Family Tisbidae Stebbing, 1910
- Family Zosimeidae Seifried, 2003
- Family Zosimidae Seifried, 2003 accepted as Zosimeidae Seifried, 2003
- 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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