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
- Order Aeschronectida †
- Order Amphionidacea
- Order Amphipoda
- Family Acanthogammaridae Garjajewia, 1901
- Family Acanthonotozomatidae Stebbing, 1906
- Family Acanthonotozomellidae Coleman & Barnard, 1991 accepted as Iphimediidae Boeck, 1871
- Family Acidostomatidae Stoddart & Lowry, 2012
- Family Adeliellidae Lowry & Myers, 2017
- Family Aeginellidae Leach, 1814 accepted as Caprellidae Leach, 1814
- Family Aetiopedesidae Myers & Lowry, 2003
- Family Alicellidae Lowry & De Broyer, 2008
- Family Allocrangonyctidae Holsinger, 1989
- Family Amaryllididae Lowry & Stoddart, 2002
- Family Amathillopsidae Pirlot, 1934
- Family Ambasiidae Lowry & Myers, 2017
- Family Ampeliscidae Krøyer, 1842
- Family Amphilochidae Boeck, 1871
- Family Amphipoda (awaiting allocation)
- Family Amphipoda incertae sedis
- Family Ampithoidae Stebbing, 1899
- Family Anamixidae accepted as Leucothoidae Dana, 1852
- Family Anapronoidae Bowman & Gruner, 1973
- Family Anatylidae accepted as Atylidae Lilljeborg, 1865
- Family Anisogammaridae Bousfield, 1977
- Family Aoridae Stebbing, 1899
- Family Archaeoscinidae Stebbing, 1904
- Family Argissidae Walker, 1904
- Family Aristiidae Lowry & Stoddart, 1997
- Family Artesiidae Holsinger, 1980
- Family Astyridae Pirlot, 1934
- Family Atylidae Lilljeborg, 1865
- Family Australomicroprotopidae Myers, Lowry & Billingham, 2016
- Family Austroniphargidae Iannilli, Krapp & Ruffo, 2011
- Family Baikalogammaridae Kamaltynov, 2001
- Family Bateidae Stebbing, 1906
- Family Bathyporeiidae Bousfeld & Shih, 1994
- Family Behningiellidae Kamaltynov, 2001
- Family Biancolinidae J.L. Barnard, 1972
- Family Bogidiellidae Hertzog, 1936
- Family Bolttsiidae Barnard & Karaman, 1987
- Family Bougisidae Zeidler, 2004
- Family Brachyscelidae Stephensen, 1923
- Family Calliopiidae G.O. Sars, 1895
- Family Caprellidae Leach, 1814
- Family Caprellinoididae accepted as Caprellidae Leach, 1814
- Family Caprogammaridae Kudrjaschov & Vassilenko, 1966
- Family Carangoliopsidae Bousfield, 1977
- Family Cardenioidae Barnard & Karaman, 1987 accepted as Synopiidae Dana, 1853
- Family Carinogammaridae Tachteew, 2001 sensu Kamaltynov, 2010
- Family Caspicolidae Birstein, 1945
- Family Cebocaridae Lowry & Stoddart, 2011
- Family Ceinidae J.L. Barnard, 1972
- Family Cheidae Thurston, 1982
- Family Cheirocratidae Ren, 2006
- Family Cheluridae Allman, 1847
- Family Chevaliidae Myers & Lowry, 2003
- Family Chillagoeidae Lowry & Myers, 2012
- Family Chiltoniidae J.L. Barnard, 1972
- Family Chuneolidae Woltereck, 1909
- Family Clarenciidae Barnard & Karaman, 1987
- Family Colomastigidae Stebbing, 1899
- Family Condukiidae Barnard & Drummond, 1982
- Family Corophiidae Leach, 1814
- Family Crangonyctidae Bousfield, 1973
- Family Crangoweckeliidae Lowry & Myers, 2012
- Family Cressidae Stebbing, 1899
- Family Crymostygidae Kristjánsson & Svavarsson, 2004
- Family Crypturopodidae Kamaltynov, 2002
- Family Cyamidae Rafinesque, 1815
- Family Cyclocaridae Lowry & Stoddart, 2011
- Family Cyllopodidae Bovallius, 1887
- Family Cyphocarididae Lowry & Stoddart, 1997
- Family Cyproideidae J.L. Barnard, 1974
- Family Cystisomatidae Willemöes-Suhm, 1875
- Family Dairellidae Bovallius, 1887
- Family Derjugianidae Lowry & Myers, 2017
- Family Dexaminidae Leach, 1814
- Family Didymocheliidae Bellan-Santini & Ledoyer, 1987
- Family Dikwidae Coleman & Barnard, 1991
- Family Dogielinotidae Gurjanova, 1953
- Family Dulichiidae Laubitz, 1983
- Family Dussartiellidae Lowry & Myers, 2012
- Family Endevouridae Lowry & Stoddart, 1997
- Family Eophliantidae Sheard, 1936
- Family Epimeriidae Boeck, 1871
- Family Eriopisidae Lowry & Myers, 2013
- Family Eulimnogammaridae Kamaltynov, 1999
- Family Eurytheneidae Stoddart & Lowry, 2004
- Family Eusiridae Stebbing, 1888
- Family Exoedicerotidae Barnard & Drummond, 1982
- Family Falklandellidae Lowry & Myers, 2012
- Family Gammaracanthidae Bousfield, 1989
- Family Gammarellidae Bousfield, 1977
- Family Gammaridae Leach, 1814
- Family Gammaroidea incertae sedis
- Family Gammaroporeiidae Bousfield, 1979
- Family Giniphargidae Lowry & Myers, 2012
- Family Hadziidae S. Karaman, 1943
- Family Haustoriidae Stebbing, 1906
- Family Hirondelleidae Lowry & Stoddart, 2010
- Family Hornelliidae d'Udekem d'Acoz, 2010
- Family Hyalellidae Bulycheva, 1957
- Family Hyalidae Bulycheva, 1957
- Family Hyperiidae Dana, 1853
- Family Hyperiopsidae Bovallius, 1886
- Family Iciliidae Dana, 1849
- Family Ingolfiellidae Hansen, 1903
- Family Ipanemidae Barnard & Thomas, 1988
- Family Iphigenellidae Kamaltynov, 2001
- Family Iphimediidae Boeck, 1871
- Family Isaeidae Dana, 1852
- Family Ischyroceridae Stebbing, 1899
- Family Iulopidae accepted as Iulopididae Zeidler, 2004
- Family Iulopididae Zeidler, 2004
- Family Izinkalidae Lowry & Stoddart, 2010
- Family Kairosidae Lowry & Myers, 2013
- Family Kamakidae Myers & Lowry, 2003
- Family Kergueleniidae Lowry & Stoddart, 2010
- Family Kergueleniolidae Lowry & Myers, 2013
- Family Kotumsaridae Messouli, Holsinger & Reddy, 2007
- Family Kuriidae J.L. Barnard, 1964
- Family Lafystiidae Sars, 1893
- Family Lanceolidae Bovallius, 1887
- Family Laphystiopsidae Stebbing, 1899
- Family Lepechinellidae Schellenberg, 1926
- Family Lepidepecreellidae Stoddart & Lowry, 2010
- Family Lestrigonidae Zeidler, 2004
- Family Leucothoidae Dana, 1852
- Family Liljeborgiidae Stebbing, 1899
- Family Luciobliviidae Tomikawa, 2007
- Family Lycaeidae Claus, 1879
- Family Lycaeopsidae Chevreux, 1913
- Family Lysianassidae Dana, 1849
- Family Lysianassoidea incertae sedis
- Family Macrohectopidae Sowinsky, 1915
- Family Maeridae Krapp-Schickel, 2008
- Family Magnovidae Alves, Lowry & Johnsson, 2020
- Family Maxillipiidae Ledoyer, 1973
- Family Megalanceolidae Zeidler, 2009
- Family Megaluropidae Thomas & Barnard, 1986
- Family Megaluropodidae Bousfield, 1982 accepted as Megaluropidae Thomas & Barnard, 1986
- Family Melitidae Bousfield, 1973
- Family Melphidippidae Stebbing, 1899
- Family Mesogammaridae Bousfield, 1977
- Family Metacrangonyctidae Boutin & Missouli, 1988
- Family Metaingolfiellidae Ruffo, 1969
- Family Metalanceolidae Zeidler, 2009
- Family Microphasmatidae Stephensen & Pirlot, 1931 accepted as Microphasmidae Stephensen & Pirlot, 1931
- Family Microphasmidae Stephensen & Pirlot, 1931
- Family Microprotopidae Myers & Lowry, 2003
- Family Microscinidae Zeidler, 2012
- Family Micruropidae
- Family Micruropodidae Kamaltynov, 1999
- Family Mimonecteolidae Zeidler, 2009
- Family Mimonectidae Bovallius, 1885
- Family Mimoscinidae Zeidler, 2012
- Family Miramarassidae Lowry, 2006
- Family Miramassidae
- Family Najnidae J.L. Barnard, 1972
- Family Neomegamphopidae Myers, 1981
- Family Neoniphargidae Bousfield, 1977
- Family Nihotungidae
- Family Niphargidae Bousfield, 1977
- Family Nuuanuidae Lowry & Myers, 2013
- Family Ochlesidae Stebbing, 1910
- Family Odiidae Coleman & Barnard, 1991
- Family Oedicerotidae Lilljeborg, 1865
- Family Ommatogammaridae Kamaltynov, 2010
- Family Opisidae Lowry & Stoddart, 1995
- Family Orchestiidae accepted as Talitridae Rafinesque, 1815
- Family Oxycephalidae Bate, 1861
- Family Pachynidae Lowry & Stoddart, 2012 accepted as Pakynidae Lowry & Myers, 2017
- Family Pachyschesidae Kamaltynov, 1999
- Family Pagetinidae K.H. Barnard, 1931
- Family Pakynidae Lowry & Myers, 2017
- Family Pallaseidae Tachteew, 2000
- Family Parabogidiellidae Cannizzaro & Sawacki, 2020
- Family Paracalliopidae accepted as Paracalliopiidae Barnard & Karaman, 1982
- Family Paracalliopiidae Barnard & Karaman, 1982
- Family Paracercopidae accepted as Caprellidae Leach, 1814
- Family Paracrangonyctidae Bousfield, 1983
- Family Paragammaropsidae Myers & Lowry, 2003
- Family Paraleptamphopidae Bousfield, 1977
- Family Paraliscidae
- Family Paramelitidae Bousfield, 1977
- Family Paramphithoidae accepted as Epimeriidae Boeck, 1871
- Family Paramphitoidae accepted as Epimeriidae Boeck, 1871
- Family Paraphronimidae Bovallius, 1887
- Family Parargissidae Lowry & Myers, 2017
- Family Parascelidae Bovallius, 1887
- Family Pardaliscidae Boeck, 1871
- Family Pariambidae Laubitz, 1993 accepted as Caprellidae Leach, 1814
- Family Perthiidae Williams & Barnard, 1988
- Family Phliantidae Stebbing, 1899
- Family Photidae Boeck, 1871
- Family Phoxocephalidae Sars, 1891
- Family Phoxocephalopsidae Barnard & Drummond, 1982
- Family Phreatogammaridae Bousfield, 1979
- Family Phronimidae Rafinesque, 1815
- Family Phrosinidae Dana, 1853
- Family Phtisicidae accepted as Caprellidae Leach, 1814
- Family Platyischnopidae Barnard & Drummond, 1979
- Family Platyscelidae Bate, 1862
- Family Pleioplateidae J.L. Barnard, 1978 accepted as Plioplateiidae
- Family Pleustidae Buchholz, 1874
- Family Plioplateidae J.L. Barnard, 1978
- Family Plioplateiidae
- Family Podoceridae Leach, 1814
- Family Podoprionidae Lowry & Stoddart, 1996
- Family Podosiridae Lowry & Myers, 2012
- Family Pontogammaridae Bousfield, 1977
- Family Pontogeneiidae Stebbing, 1906
- Family Pontoporeiidae Dana, 1853
- Family Priscillinidae d'Udekem d'Acoz, 2006
- Family Priscomilitaridae Hirayama, 1988
- Family Prolanceolidae Zeidler, 2009
- Family Pronoidae Claus, 1879
- Family Prophliantidae accepted as Dexaminidae Leach, 1814
- Family Proscinidae Pirlot, 1933 accepted as Mimonectidae Bovallius, 1885
- Family Protellidae McCain, 1970 accepted as Caprellidae Leach, 1814
- Family Protodulichiidae Ariyama, 2020
- Family Protorchestiidae Myers & Lowry, 2020
- Family Pseudamphilochidae Schellenberg, 1931 accepted as Pseudamphilochidae Lowry & Myers, 2017
- Family Pseudamphilochidae Lowry & Myers, 2017
- Family Pseudingolfiellidae Lowry & Myers, 2012
- Family Pseudocrangonyctidae Holsinger, 1989
- Family Pseudoniphargidae Karaman, 1993
- Family Rakiroidae Myers & Lowry, 2003
- Family Regaliidae Lowry, 2006
- Family Salentinellidae Bousfield, 1977
- Family Sanchoidae Lowry, 2006
- Family Sandroidae Lowry & Myers, 2012
- Family Scinidae Stebbing, 1888
- Family Scopelocheiridae Lowry & Stoddart, 1997
- Family Sebidae Walker, 1908
- Family Seborgiidae Holsinger, 1980
- Family Sensonatoridae Lowry & Myers, 2012
- Family Sicafodiidae Just, 2004
- Family Sinurothoidae Ren, 1999
- Family Sophrosynidae Lowry & Stoddart, 2010
- Family Stegocephalidae Dana, 1855
- Family Stenothoidae Boeck, 1871
- Family Sternophysingidae Holsinger, 1992
- Family Stilipedidae Holmes, 1908
- Family Synopiidae Dana, 1853
- Family Talitridae Rafinesque, 1815
- Family Temnophliantidae Griffiths, 1975
- Family Thaumatelsonidae accepted as Stenothoidae Boeck, 1871
- Family Thoriellidae Lowry & Stoddart, 2011
- Family Thurstonellidae Lowry & Zeidler, 2008
- Family Tironidae accepted as Synopiidae Dana, 1853
- Family Trischizostomatidae Liljeborg, 1865
- Family Tryphanidae
- Family Tryphantidae
- Family Tryphosidae Lowry & Stoddart, 1997
- Family Tulearidae Ledoyer, 1979
- Genus Tulearis
- Genus Tulearus Ledoyer, 1979
- Family Typhlogammaridae Bousfield, 1979
- Family Unciolidae Myers & Lowry, 2003
- Family Uristidae Hurley, 1963
- Family Urohaustoriidae Barnard & Drummond, 1982
- Family Uronyctidae Lowry & Myers, 2012
- Family Urothoidae Bousfield, 1978
- Family Valettidae Stebbing, 1888
- Family Valettiidae Stebbing, 1888
- Family Valettiopsidae Lowry & De Broyer, 2008
- Family Vemanidae Lowry & Myers, 2017
- Family Vibiliidae Dana, 1852
- Family Vicmusiidae Just, 1990
- Family Vitjazianidae Birstein & M. Vinogradov, 1955
- Family Wandinidae Lowry & Stoddart, 1990
- Family Zaramillidae Lowry & Myers, 2016
- Family Zobrachoidae Barnard & Drummond, 1982
- Order Anaspidacea
- Order Angustidontida †
- Order Archaeostraca †
- Order Asellota (awaiting allocation)
- Order Bathynellacea
- Order Belotelsonidea †
- Order Cumacea
- Order Decapoda
- Order Eocaridacea †
- Order Eumalacostraca (awaiting allocation)
- Order Euphausiacea
- Order Hoplostraca
- Order Hymenostraca †
- Order Isopoda
- Order Leptostraca
- Order Lophogastrida
- Order Malacostraca (awaiting allocation)
- Order Mictacea
- Order Mysida
- Order Palaeocaridacea †
- Order Palaeostomatopoda †
- Order Phyllocarida (awaiting allocation)
- Order Phyllocarida incertae sedis †
- Order Pygocephalomorpha †
- Order Spelaeogriphacea
- Order Stomatopoda
- Order Syncarida incertae sedis †
- Order Tanaidacea
- Order Thermosbaenacea
- Order Waterstonellidea
- Family Essoidiidae Schram, 1974 †
- Genus Hohensteiniella Haug, Poschmann, Hörnig & Lutz, 2016 †
- Genus Mesoprosopon Stolley, 1914 †
- Class Maxillopoda
- 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 †
- 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 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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