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
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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
- 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
- Family Agathotanaidae Lang, 1971
- Family Akanthophoreidae Sieg, 1986
- Family Alavatanaidae Vonk & Schram, 2007 †
- Family Anarthruridae Lang, 1971
- Family Anthracocarididae Schram, 1979 †
- Family Anuropodidae Bacescu, 1980 accepted as Parapseudidae Guţu, 1981
- Family Apseudellidae Guţu, 1972
- Family Apseudidae Leach, 1814
- Genus Androgynella Guţu, 2006 accepted as Apseudes Leach, 1814
- Species Androgynella crozetensis (Shiino, 1978) accepted as Androgynella spectabilis (Studer, 1883)
- Species Androgynella curtiramus Gu?u, 2007 accepted as Apseudes curtiramus (Gu?u, 2007)
- Species Androgynella fecunda Gu?u, 2006
- Species Androgynella nagae (Shiino, 1978) accepted as Apseudes nagae Shiino, 1978
- Species Androgynella nhatrangensis (Shiino, 1978) accepted as Apseudes nhatrangensis Shiino, 1978
- Species Androgynella nipponicus (Shiino, 1978) accepted as Apseudes nipponicus Shiino, 1978
- Species Androgynella sculptus (Pfeffer, 1888) accepted as Apseudes sculptus Pfeffer, 1888
- Species Androgynella spectabilis (Studer, 1883) accepted as Apseudes spectabilis Studer, 1884
- Genus Annexos Błażewicz-Paszkowycz & Bamber, 2007 accepted as Apseudes Leach, 1814
- Genus Apseudes Leach, 1814
- Genus Apseudopsis Norman, 1899
- Genus Atlantapseudes Bacescu, 1978
- Genus Bilobatus Sieg, 1993 accepted as Siegius Allsopp, 2017
- Genus Bunakenia Guţu, 1995
- Genus Calozodian
- Genus Carpoapseudes Lang, 1968
- Genus Collossella Jóźwiak & Błażewicz-Paszkowycz, 2007 accepted as Fageapseudes Băcescu & Guţu, 1971
- Genus Colobocladus Guţu, 2006
- Genus Dactyloprion Guţu, 2002
- Genus Dalapseudes Boone, 1923 accepted as Parapseudes Sars, 1882
- Genus Eliomosa Guţu, 2006
- Genus Euphaeus Agassiz, 1846 accepted as Apseudes Leach, 1814
- Genus Eupheus Risso, 1816 accepted as Apseudes Leach, 1814
- Genus Extensibasella Guţu, 1996
- Genus Fageapseudes Băcescu & Guţu, 1971
- Genus Falsapseudes Guţu, 2006
- Genus Glabroapseudes Guerrero-Kommritz & Heard, 2003
- Genus Gollumedes Bamber, 2000
- Genus Gollumudes Bamber, 2000 accepted as Paradoxapseudes Guţu, 1991
- Genus Imitapseudes Menzies, 1953 accepted as Apseudomorpha Miller, 1940
- Genus Impectinatus Guțu, 2006
- Genus Langapseudes Bacescu, 1987
- Genus Leiopus Beddard, 1886 accepted as Leviapseudes Sieg, 1983
- Genus Leviapseudes Sieg, 1983
- Genus Mendamanus Bamber, 1999
- Genus Muramura Guţu, 2006 accepted as Muramurina Guţu, 2007
- Genus Muramurina Guţu, 2007 accepted as Apseudes Leach, 1814
- Genus Obscurapseudes Guţu, 2006
- Genus Paradoxapseudes Guţu, 1991
- Genus Pectinapseudes Bacescu & Williams, 1988
- Genus Pseudobunakenia Drumm & Heard, 2022
- Genus Pugioapseudes Guţu, 1995 accepted as Pugiodactylus Guţu, 1995
- Genus Pugiodactylus Guţu, 1995
- Genus Rhaea Guérin-Méneville, 1828
- Genus Rhoea Milne Edwards, 1828 accepted as Apseudes Leach, 1814
- Genus Siegius Allsopp, 2017
- Genus Spinoapseudes Guţu, 1996
- Genus Spinosapseudes Guţu, 1996
- Genus Taraxapseudes Santos & Hansknecht, 2007
- Genus Tuberapseudes Băcescu & Guţu, 1971
- Genus Typhlapseudes Beddard, 1886
- Genus Xanthapseudes Guţu, 2008 accepted as Apseudes Leach, 1814
- Genus Zoidbergus Jóźwiak, 2014
- Family Colletteidae Larsen & Wilson, 2002
- Family Cretitanaidae Schram, Sieg & Malzahn, 1986 †
- Family Cryptocaridae Sieg, 1980 †
- Family Cryptocopidae Bird & Larsen, 2009
- Family Gigantapseudidae Kudinova-Pasternak, 1978
- Family Hamatipedidae Błażewicz, Gellert & Bird, 2022
- Family Heterotanoididae Bird, 2012
- Family Julmarichardiidae Moralés-Núñez & Heard, 2021
- Family Jurapseudidae Schram, Sieg & Malzahn, 1986 †
- Family Jurapseudoidea incertae sedis
- Family Kalliapseudidae Lang, 1956
- Family Leptocheliidae Lang, 1973
- Family Leptognathiidae Lang, 1976
- Family Metapseudidae Lang, 1970
- Family Mirandotanaidae Błażewicz-Paszkowycz & Bamber, 2009
- Family Neotanaidae Lang, 1956
- Family Neotanaididae
- Family Niveotanaidae Polz, 2005 †
- Family Nototanaidae Sieg, 1976
- Family Nototanaididae accepted as Nototanaidae Sieg, 1976
- Family Numbakullidae
- Family Pagurapseudidae Lang, 1970
- Family Pagurapseudopsididae Guţu, 2006
- Family Paranarthrurellidae Błażewicz, Jóźwiak & Frutos, 2019
- Family Parapseudidae Guţu, 1981
- Family Paratanaidae Lang, 1949
- Family Paratanaoidea incertae sedis
- Family Protoapseudoidae Heard & Morales-Nunez, 2020 †
- Family Protoparapseudidae Heard & Morales-Nunez, 2020 † accepted as Protoapseudoidae Heard & Morales-Nunez, 2020 †
- Family Pseudotanaidae Sieg, 1976
- Family Pseudozeuxidae Sieg, 1982
- Family Sphaeromapseudidae Larsen, 2011
- Family Sphyrapidae Guţu, 1980 accepted as Sphyrapodidae Guţu, 1980
- Family Sphyrapodidae Guţu, 1980
- Family Tanaellidae Larsen & Wilson, 2002
- Family Tanaidacea (awaiting allocation)
- Family Tanaidacea incertae sedis
- Family Tanaidae Dana, 1849 accepted as Tanaididae Nobili, 1906
- Family Tanaididae Nobili, 1906
- Family Tanaissuidae Bird & Larsen, 2009
- Family Tanaopsidae Błażewicz-Paszkowycz & Bamber, 2012
- Family Tanzanapseudidae Bacescu, 1975
- Family Teleotanaidae Bamber, 2008
- Family Typhlotanaidae Sieg, 1986
- Family Whiteleggiidae Guţu, 1972
- 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 †
- 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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