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
- Order Anaspidacea
- Order Angustidontida †
- Order Archaeostraca †
- Order Asellota (awaiting allocation)
- Order Bathynellacea
- Order Belotelsonidea †
- Order Cumacea
- Order Decapoda
- Family Acanthephyridae Bate, 1888
- Family Acanthonychidae accepted as Epialtidae MacLeay, 1838
- Family Aciculopodidae Feldmann & Schweitzer, 2010 †
- Family Acidopsidae Števčić, 2005
- Family Aegeridae Münster, 1839 †
- Family Aeglidae Dana, 1852
- Family Aethridae Dana, 1851
- Family Agostocarididae C.W.J. Hart & Manning, 1986
- Family Albuneidae Stimpson, 1858
- Family Alpheidae Rafinesque, 1815
- Family Alvinocarididae Christoffersen, 1986
- Family Amazighopsidae Garassino & Pasini, 2018 †
- Family Anacalliacidae Manning & Felder, 1991
- Family Anchialocarididae Mejía-Ortíz, Yañez & López-Mejía, 2017
- Family Anchistioididae Borradaile, 1915
- Family Annuntidiogenidae Fraaije, 2014 †
- Family Anomura (awaiting allocation)
- Family Antrocarcinidae Ng & Chia, 1994
- Family Aphanodactylidae Ahyong & Ng, 2009
- Family Arabicarcinidae Schweitzer & Feldmann, 2017 †
- Family Archaeochiapasidae Guinot, Carbot-Chanona & Vega, 2019 †
- Family Archaeopidae Karasawa, Kishimoto, Ohara & Ando, 2019 †
- Family Archaeoportunidae Artal, Ossó & Domínguez, 2013 †
- Family Aristeidae Wood-Mason in Wood-Mason & Alcock, 1891
- Family Astacidae Latreille, 1802
- Family Astacura (awaiting allocation)
- Family Atelecyclidae Ortmann, 1893
- Family Atyidae De Haan, 1849
- Family Axianassidae Schmitt, 1924
- Family Axiidae Huxley, 1879
- Family Barbouriidae Christoffersen, 1987
- Family Basinotopidae Karasawa, Schweitzer & Feldmann, 2011 †
- Family Bathypalaemonellidae De Saint Laurent, 1985
- Family Belliidae Dana, 1852
- Family Benthesicymidae Wood-Mason in Wood-Mason & Alcock, 1891
- Family Blastidae Stebbing, 1902 accepted as Epialtidae MacLeay, 1838
- Family Blepharipodidae Boyko, 2002
- Family Brachyura (awaiting allocation)
- Family Brachyura incertae sedis
- Family Brankocleistostomidae Števčić, 2011
- Family Bresiliidae Calman, 1896
- Family Brusiniidae Števčić, 1991
- Family Bucculentidae †
- Family Bythograeidae Williams, 1980
- Family Calappidae De Haan, 1833
- Family Calappoidea (awaiting allocation)
- Family Callianassidae Dana, 1852
- Family Callianideidae Kossman, 1880
- Family Callianopsidae Manning & Felder, 1991
- Family Callichimaeridae Luque et al., 2019 †
- Family Callichiridae Manning & Felder, 1991
- Family Calocarididae Ortmann, 1891
- Family Camarocarcinidae †
- Family Cambaridae Hobbs, 1942
- Family Camptandriidae Stimpson, 1858
- Family Campylonotidae Sollaud, 1913
- Family Cancridae Latreille, 1802
- Family Cancrinidae Beurlen, 1930 †
- Family Carcineretidae Beurlen, 1930 †
- Family Carcinidae MacLeay, 1838
- Family Carcinoplacidae
- Family Caridea (awaiting allocation)
- Family Caridea incertae sedis
- Family Carinocarcinoididae Karasawa & Kato, 2003 †
- Family Carpiliidae Ortmann, 1893
- Family Carpopenaeidae †
- Family Catoptridae Borradaile, 1902
- Family Cenomanocarcinidae †
- Family Chasmocarcinidae Serène, 1964
- Family Cheiragonidae Ortmann, 1893
- Family Chilenophoberidae †
- Family Chimaerastacidae †
- Family Chirostylidae Ortmann, 1892
- Family Christmaplacidae Naruse & Ng, 2014
- Family Clytiopsidae Beurlen, 1927 †
- Family Coenobitidae Dana, 1851
- Family Coleiidae Van Straelen, 1924 †
- Family Componocancridae †
- Family Conleyidae Števčić, 2005
- Family Corystidae Samouelle, 1819
- Family Costacoplumidae St Laurent, 1989 †
- Family Crangonidae Haworth, 1825
- Family Cretapsaridae Luque, 2021 †
- Family Cricoidoscelosidae †
- Family Crossotonotidae Moosa & Serène, 1981
- Family Cryptochiridae Paul'son, 1875
- Family Ctenochelidae Manning & Felder, 1991
- Family Ctenocheloidae Sakai, 2011
- Family Cyclodorippidae Ortmann, 1892
- Family Cymonomidae Bouvier, 1898
- Family Dacryopilumnidae Serène, 1984
- Family Dairidae Ng & Rodríguez, 1986
- Family Dairoididae Števčić, 2005
- Family Dakoticancridae †
- Family Daldorfiidae Ng & Rodriguez, 1986 accepted as Parthenopidae MacLeay, 1838
- Family Decapoda (awaiting allocation)
- Family Decapoda incertae sedis
- Family Deckeniidae Ortmann, 1897
- Family Desmocarididae Borradaile, 1915
- Family Diaulacidae Wright & Collins, 1972 †
- Family Diogenidae Ortmann, 1892
- Family Disciadidae Rathbun, 1902
- Family Domeciidae Ortmann, 1893
- Family Dorippidae MacLeay, 1838
- Family Dotillidae Stimpson, 1858
- Family Dromiidae de Haan, 1833
- Family Dynomenidae Ortmann, 1892
- Family Eiconaxiidae Sakai & Ohta, 2005
- Family Eiconaxiopsididae Sakai, 2011
- Family Enoplometopidae Saint Laurent, 1988
- Family Eocarcinidae Withers, 1932 †
- Family Eocarididae Brooks, 1962 †
- Family Eogeryonidae Ossó, 2016 †
- Family Epialtidae MacLeay, 1838
- Family Eriphiidae MacLeay, 1838
- Family Erymidae †
- Family Eryonidae De Haan, 1841 †
- Family Ethusidae Guinot, 1977
- Family Etyidae Guinot & Tavares, 2001 †
- Family Etyiidae † accepted as Etyidae Guinot & Tavares, 2001 †
- Family Eucalliacidae Manning & Felder, 1991
- Family Eugonatonotidae Chace, 1937
- Family Eumedonidae accepted as Pilumnidae Samouelle, 1819
- Family Eumunididae A. Milne-Edwards & Bouvier, 1900
- Family Euryplacidae Stimpson, 1871
- Family Euryrhynchidae Holthuis, 1950
- Family Feldmanniidae Schweitzer, Feldmann, Franţescu & Klompmaker, 2012 †
- Family Folguerolesiidae Artal & Hyžný, 2016 †
- Family Galatheacarididae
- Family Galatheidae Samouelle, 1819
- Family Galatheoidea (awaiting allocation)
- Family Galenidae Alcock, 1898
- Family Garthiellidae Mendoza & Manuel-Santos, 2012
- Family Garthopilumnidae Števčić, 2011 accepted as Eriphiidae MacLeay, 1838
- Family Gastrodoridae †
- Family Gebiadae Haworth, 1825 accepted as Upogebiidae Borradaile, 1903
- Family Gecarcinidae MacLeay, 1838
- Family Gecarcinucidae Rathbun, 1904
- Family Geryonidae Colosi, 1923
- Family Glaessnericarididae Karasawa, Schweitzer & Feldmann, 2013 †
- Family Glaessneropsidae Patrulius, 1959 †
- Family Glypheidae Winkler, 1882
- Family Glyphocrangonidae Smith, 1884
- Family Glyptograpsidae Schubart, Cuesta & Felder, 2002
- Family Gnathophyllidae Dana, 1852
- Family Goneplacidae MacLeay, 1838
- Family Goneplacoidea incertae sedis
- Family Goniodromitidae †
- Family Gourettiidae accepted as Gourretiidae Sakai, 1999
- Family Gourretiidae Sakai, 1999 accepted as Ctenochelidae Manning & Felder, 1991
- Family Grapsidae MacLeay, 1838
- Family Grapsoidea (awaiting allocation)
- Family Hapalocarcinidae accepted as Cryptochiridae Paul'son, 1875
- Family Hapalogastridae Brandt, 1850
- Family Hectarthropidae accepted as Processidae Ortmann, 1896
- Family Heloeciidae H. Milne Edwards, 1852
- Family Hepatidae Stimpson, 1871
- Family Hexapodidae Miers, 1886
- Family Hippidae Latreille, 1825
- Family Hippolytidae Spence Bate, 1888
- Family Homolidae de Haan, 1833
- Family Homolodromiidae Alcock, 1899
- Family Homolodromioidea (awaiting allocation)
- Family Hymenoceridae Ortmann, 1890
- Family Hymenosomatidae MacLeay, 1838
- Family Hypothalassiidae Karasawa & Schweitzer, 2006
- Family Ibericancridae Artal, Guinot, van Bakel & Castillo, 2008 †
- Family Icriocarcinidae Števčić, 2005 † accepted as Lithophylacidae Van Straelen, 1936 †
- Family Inachidae MacLeay, 1838
- Family Inachoididae Dana, 1851
- Family Iphiculidae Alcock, 1896
- Family Isolapotamidae
- Family Juglocarcinidae Garvie, Collins & Mellish, 2017 † accepted as Orithopsidae Schweitzer, Feldmann, Fam, Hessin, Hetrick, Nyborg & Ross, 2003 †
- Family Jurellanidae Klompmaker & Robins, 2019 †
- Family Kakaducarididae Bruce, 1993
- Family Kiwaidae Macpherson, Jones & Segonzac, 2005
- Family Konidromitidae †
- Family Kuwaitupogebiidae Sakai, Türkay & Al Aidaroos, 2015
- Family Laomediidae Borradaile, 1903
- Family Latreilliidae Stimpson, 1858
- Family Lazarocleistostomidae Števčić, 2011
- Family Lecythocaridae †
- Family Leptograpsodidae Guinot, Ng & Rodríguez Moreno, 2018
- Family Leucosiidae Samouelle, 1819
- Family Linnaeoxanthidae Števčić, 2005
- Family Lipkiidae Burukovsky, 2012
- Family Lithodidae Samouelle, 1819
- Family Lithophylacidae Van Straelen, 1936 †
- Family Litocheiridae Števčić, 2005
- Family Litogastridae Karasawa, Schweitzer & Feldmann, 2013 †
- Family Litogastroidae Karasawa, Schweitzer & Feldmann, 2013 † accepted as Litogastridae Karasawa, Schweitzer & Feldmann, 2013 †
- Family Lomidae Glassner, 1969 accepted as Lomisidae Bouvier, 1895
- Family Lomisidae Bouvier, 1895
- Family Lomisinés Bouvier, 1894 accepted as Lomisidae Bouvier, 1895
- Family Longodromitidae Schweitzer & Feldmann, 2009 †
- Family Longusorbiidae †
- Family Luciferidae De Haan, 1849 [in De Haan, 1833-1850]
- Family Lyreididae Guinot, 1993
- Family Lysmatidae Dana, 1852
- Family Macromaxillocarididae Alvarez, Iliffe & Villalobos, 2006
- Family Macrophthalmidae Dana, 1851
- Family Macropipidae Stephenson & Campbell, 1960
- Family Magyarcarcinidae Domínguez & Ossó, 2016 †
- Family Majidae Samouelle, 1819
- Family Mamaiidae accepted as Majidae Samouelle, 1819
- Family Marocarcinidae †
- Family Martinocarcinidae †
- Family Mathildellidae Karasawa & Kato, 2003
- Family Matutidae de Haan, 1835
- Family Mecochiridae Van Straelen, 1925 †
- Family Menippidae Ortmann, 1893
- Family Micheleidae Sakai, 1992
- Family Mictyridae Dana, 1851
- Family Mimilambridae accepted as Parthenopidae MacLeay, 1838
- Family Mirocarididae
- Family Mithracidae MacLeay, 1838
- Family Mithracitidae Števčić, 2005 †
- Family Montemagrechiridae Klompmaker, Portell & van der Meij, 2016 †
- Family Montezumellidae Ossó & Domínguez, 2013 †
- Family Munididae Ahyong, Baba, MacPherson & Poore, 2010
- Family Munidopsidae Ortmann, 1898
- Family Nanocassiopidae Števčić, 2013
- Family Necrocarcinidae Förster, 1968 †
- Family Nematocarcinidae Smith, 1884
- Family Neoaxiidae Sakai, 2017 accepted as Axiidae Huxley, 1879
- Family Neoglypheidae Karasawa, Schweitzer & Feldmann, 2013
- Family Nephropidae Dana, 1852
- Family Nodoprosopidae †
- Family Ocypodidae Rafinesque, 1815
- Family Ogyrididae Holthuis, 1955
- Family Oplophoridae Dana, 1852
- Family Oregoniidae Garth, 1958
- Family Orithopsidae Schweitzer, Feldmann, Fam, Hessin, Hetrick, Nyborg & Ross, 2003 †
- Family Orithyiidae Dana, 1852
- Family Ovalipidae Spiridonov, Neretina & Schepetov, 2014
- Family Oziidae Dana, 1851
- Family Paguridae Latreille, 1802
- Genus Acanthopagurus de Saint Laurent, 1968
- Genus Agaricochirus McLaughlin, 1981
- Genus Alainopaguroides McLaughlin, 1997
- Genus Alainopagurus Lemaitre & McLaughlin, 1995
- Genus Alloeopagurodes Komai, 1998
- Genus Anapagrides de Saint Laurent-Dechancé, 1966
- Genus Anapagurus Henderson, 1886
- Genus Anisopagurus McLaughlin, 1981
- Genus Australeremus McLaughlin, 1981 accepted as Lophopagurus McLaughlin, 1981
- Genus Bathiopagurus McLaughlin, 2003
- Genus Bathypaguropsis McLaughlin, 1994
- Genus Benthopagurus Wass, 1963 accepted as Tomopagurus A. Milne-Edwards & Bouvier, 1893
- Genus Bernhardus Dana, 1851 accepted as Pagurus Fabricius, 1775
- Genus Boninpagurus Asakura & Tachikawa, 2004
- Genus Bythiopagurus McLaughlin, 2003
- Genus Capsulapagurus Fraaije, van Bakel, Iserbyt & Jagt, 2011 †
- Genus Catapaguroides A. Milne-Edwards & Bouvier, 1892
- Genus Catapaguropsis Lemaitre & Mclaughlin, 2006
- Genus Catapagurus A. Milne-Edwards, 1880
- Genus Ceratopagurus Yokoya, 1933
- Species Ceratopagurus pilosimanus Yokoya, 1933
- Species Ceratopagurus tricarinatus (Stimpson, 1858) accepted as Nematopagurus tricarinatus (Stimpson, 1858)
- Genus Cestopagurus Bouvier, 1897
- Genus Chanopagurus Lemaitre, 2003
- Genus Cretacocalcinus Ferratges, Hyžný & Zamora, 2021 †
- Genus Cycetopagurus McLaughlin, 2004
- Genus Decaphyllus de Saint Laurent, 1968
- Genus Dentalopagurus McLaughlin, 2007
- Genus Diacanthurus McLaughlin & Forest, 1997
- Genus Diacanthus accepted as Diacanthurus McLaughlin & Forest, 1997
- Genus Discorsopagurus McLaughlin, 1974
- Genus Dofleinia McLaughlin & Asakura, 2004 accepted as Pagurodofleinia Asakura, 2005
- Genus Elassochirus Benedict, 1892
- Genus Enallopaguropsis McLaughlin, 1981
- Genus Enallopagurus McLaughlin, 1981
- Genus Enneobranchus García-Gómez, 1988
- Genus Enneopagurus McLaughlin, 1997
- Genus Enneophyllus McLaughlin, 1997
- Genus Eupagurus Brandt, 1851 accepted as Pagurus Fabricius, 1775
- Genus Eutrichopagurus Komai, 2015
- Genus Forestopagurus García-Gómez, 1995
- Genus Galapagurus Boone, 1932 accepted as Pylopaguropsis Alcock, 1905
- Genus Glaucothoe H. Milne Edwards, 1830
- Genus Goniochirus Étallon, 1861 †
- Genus Goreopagurus McLaughlin, 1988
- Genus Hachijopagurus Osawa & Okuno, 2003
- Genus Haigia McLaughlin, 1981 accepted as Haigiopagurus McLaughlin, 2005
- Genus Haigiopagurus McLaughlin, 2005
- Genus Hemipagurus Smith, 1881 accepted as Catapagurus A. Milne-Edwards, 1880
- Genus Icelopagurus McLaughlin, 1997
- Genus Iridopagurus de Saint Laurent-Dechancé, 1966
- Genus Jacquesia de Saint Laurent & McLaughlin, 1999 accepted as Pagurojacquesia de Saint Laurent & McLaughlin in Forest, de Saint Laurent, McLaughlin & Lemaitre, 2000
- Genus Kumepagurus Komai & Osawa, 2012
- Genus Labidochirus Benedict, 1892
- Genus Latra Gistl, 1848 accepted as Pagurus Fabricius, 1775
- Genus Latro Billberg, 1820 accepted as Pagurus Fabricius, 1775
- Genus Laurentia McLaughlin & Haig, 1996 accepted as Turleania McLaughlin, 1997
- Genus Leptopagurus Lemaitre, Felder & Poupin, 2017
- Genus Lessinipagurus Beschin, De Angeli, Checchi & Zarantonello, 2012 †
- Genus Libidochirus Benedict, 1892 accepted as Labidochirus Benedict, 1892
- Genus Lithopagurus Provenzano, 1968
- Genus Litorepagurus Fraaije, Van Bakel, Jagt, Wallaard & De Coninck, 2023 †
- Genus Longipaguristes De Angeli & Caporiondo, 2017 †
- Genus Lophopagurus McLaughlin, 1981
- Genus Manucomplanus McLaughlin, 1981
- Genus Michelopagurus McLaughlin, 1997
- Genus Micropagurus McLaughlin, 1986
- Genus Munidopagurus A. Milne-Edwards & Bouvier, 1893
- Genus Nanopagurus McLaughlin, 1986 accepted as Anapagrides de Saint Laurent-Dechancé, 1966
- Genus Nematopaguroides Forest & de Saint Laurent, 1968
- Genus Nematopagurus A. Milne-Edwards & Bouvier, 1892
- Genus Nylopagurus Balss, 1921 accepted as Pylopagurus A. Milne-Edwards & Bouvier, 1893
- Genus Nympagurus Boone, 1932 accepted as Pagurus Fabricius, 1775
- Genus Orbispagurus De Angeli & Caporiondo, 2017 †
- Genus Orhomalus Étallon, 1861 †
- Genus Orthopaguropsis Serène, 1957 accepted as Paguritta Melin, 1939
- Genus Orthopagurus Stevens, 1927
- Genus Ostraconotus A. Milne-Edwards, 1880
- Genus Pagurellus Lemaitre, Felder & Poupin, 2017
- Genus Paguridium Forest, 1961
- Genus Pagurillus accepted as Eupagurus Brandt, 1851
- Genus Pagurina Lemaitre, Felder & Poupin, 2017
- Genus Paguriscus Lemaitre, Felder & Poupin, 2017
- Genus Paguritergites Fraaije, Artal, van Bakel, Jagt & Klompmaker, 2013 †
- Genus Paguritta Melin, 1939
- Genus Pagurixus Melin, 1939
- Genus Pagurodes Henderson, 1888
- Genus Pagurodofleinia Asakura, 2005
- Genus Pagurojacquesia de Saint Laurent & McLaughlin in Forest, de Saint Laurent, McLaughlin & Lemaitre, 2000
- Genus Paguruncio Lemaitre, Felder & Poupin, 2017
- Genus Pagurus Fabricius, 1775
- Genus Palaeopagurus Van Straelen, 1924 †
- Genus Parapagurodes McLaughlin & Haig, 1973
- Genus Patagurus Anker & Paulay, 2013
- Genus Phimochirus McLaughlin, 1981
- Genus Phylopagurus accepted as Pylopagurus A. Milne-Edwards & Bouvier, 1893
- Genus Planopagurus Wolff, 1960 accepted as Probeebei Boone, 1926
- Genus Pliopagurus Komai, 2013
- Genus Porcellanopagurus Filhol, 1885
- Genus Propagurus McLaughlin & de Saint Laurent, 1998
- Genus Protoniopagurus Lemaitre & McLaughlin, 1996
- Genus Protopagurus Fraaije, Robins, van Bakel, Jagt & Bachmayer, 2019 †
- Genus Pseudopagurodes McLaughlin, 1997
- Genus Pteropagurus McLaughlin & Rahayu, 2006
- Genus Pumilopagurus McLaughlin & Rahayu, 2008
- Genus Pumilopaurus McLaughlin & Rahayu, 2008
- Genus Pusillopagurus Lemaitre, Felder & Poupin, 2017
- Genus Pygmaeopagurus McLaughlin, 1986
- Genus Pylopaguridium McLaughlin & Lemaitre, 2001
- Genus Pylopaguropsis Alcock, 1905
- Genus Pylopagurus A. Milne-Edwards & Bouvier, 1893
- Genus Raripagurus Lemaitre & Felder, 2023
- Genus Rhodochirus McLaughlin, 1981
- Genus Scopaeopagurus McLaughlin & Hogarth, 1998
- Genus Solenopagurus de Saint Laurent, 1968
- Genus Solitariopagurus Türkay, 1986
- Genus Spathapagurus Lemaitre & Felder, 2011
- Genus Spiropagurus Stimpson, 1858
- Genus Tarrasopagurus McLaughlin, 1997
- Genus Tomopaguroides Balss, 1912
- Genus Tomopaguropsis Alcock, 1905
- Genus Tomopagurus A. Milne-Edwards & Bouvier, 1893
- Genus Trichopagurus de Saint Laurent, 1968
- Genus Trigonocheirus Benedict, 1892 accepted as Pagurus Fabricius, 1775
- Genus Trigonochirus Benedict, 1892 accepted as Pagurus Fabricius, 1775
- Genus Turleania McLaughlin, 1997
- Genus Vounopagurus Komai, Rahayu & Fujita, 2021
- Genus Xylopagurus A. Milne-Edwards, 1880
- Family Paguroidea incertae sedis †
- Family Palaemonidae Rafinesque, 1815
- Family Palaeocorystidae Lőrenthey in Lőrenthey & Beurlen, 1929 †
- Family Palaeopalaemonidae Rafinesque, 1815 †
- Family Palaeopentachelidae †
- Family Paleoxanthopsidae †
- Family Palicidae Bouvier, 1898
- Family Palinura (awaiting allocation)
- Family Palinuridae Latreille, 1802
- Family Pandalidae Haworth, 1825
- Family Panopeidae Ortmann, 1893
- Family Paracalliacidae Sakai, 2005
- Family Parapaguridae Smith, 1882
- Family Parapinnixidae Števčić, 2005
- Family Parapylochelidae Fraaije, Klompmaker & Artal, 2012 †
- Family Parastacidae
- Family Parathelphusidae Alcock, 1910
- Family Parthenopidae MacLeay, 1838
- Family Pasiphaeidae Dana, 1852
- Family Pemphicidae †
- Family Penaeidae Rafinesque, 1815
- Family Penaeoidea incertae sedis
- Family Percnidae Števčić, 2005
- Family Phyllotymolinidae Tavares, 1998
- Family Physetocarididae Chace, 1940
- Family Pilumnidae Samouelle, 1819
- Family Pilumnoididae Guinot & MacPherson, 1987
- Family Pinnotheridae de Haan, 1833
- Family Pirimelidae Alcock, 1899
- Family Pisidae Dana, 1851 accepted as Majidae Samouelle, 1819
- Family Plagusiidae Dana, 1851
- Family Planopilumnidae Serène, 1984
- Family Plantergidae accepted as Majidae Samouelle, 1819
- Family Platychelidae Glaessner, 1969 †
- Family Platykottidae Chablais, Feldmann & Schweitzer, 2011 †
- Family Platythelphusidae
- Family Platyxanthidae Guinot, 1977
- Family Pleocyemata incertae sedis
- Family Pleopteryxidae †
- Family Polybiidae Ortmann, 1893
- Family Polychelida incertae sedis †
- Family Polychelidae Wood-Mason, 1875
- Family Pomatochelidae accepted as Pylochelidae Bate, 1888
- Family Porcellanidae Haworth, 1825
- Family Portunidae Rafinesque, 1819
- Family Portunoidea incertae sedis
- Family Potamidae Ortmann, 1896
- Family Potamocarcinidae
- Family Potamonautidae Bott, 1970
- Family Potamonidae Ortmann, 1893 accepted as Pseudothelphusidae Ortmann, 1893
- Family Poupiniidae Guinot, 1991
- Family Priscinachidae Breton, 2009 †
- Family Pristinaspinidae Ahyong & Roterman, 2014 †
- Family Procarididae Chace & Manning, 1972
- Family Procaridoidea (awaiting allocation)
- Family Processidae Ortmann, 1896
- Family Progeryonidae Števčić, 2005
- Family Prosopidae von Meyer, 1860 †
- Family Protastacidae †
- Family Psalidopodidae Wood-Mason in Wood-Mason & Alcock, 1892
- Family Psammocarcinidae †
- Family Pseudochelidae De Grave & Moosa, 2004
- Family Pseudorhombilidae Alcock, 1900 accepted as Panopeidae Ortmann, 1893
- Family Pseudothelphusidae Ortmann, 1893
- Family Pseudoziidae Alcock, 1898
- Family Pylochelidae Bate, 1888
- Family Pylojacquesidae McLaughlin & Lemaitre, 2001
- Family Quadratoplanidae Franţescu, 2014 †
- Family Raninidae de Haan, 1833
- Family Raninoida incertae sedis †
- Family Retroplumidae Gill, 1894
- Family Retrorsichelidae †
- Family Rhynchocinetidae Ortmann, 1890
- Family Scalopidiidae Števčić, 2005
- Family Schobertellidae Schweigert, Fraaije, Havlik & Nützel, 2013 †
- Family Scyllaridae Latreille, 1825
- Family Sergestidae Dana, 1852
- Family Sergestoidea incertae sedis
- Family Sesarmidae Dana, 1851
- Family Sicyoniidae Ortmann, 1898
- Family Sinopotamidae
- Family Solenoceridae Wood-Mason in Wood-Mason & Alcock, 1891
- Family Sotoplacidae Castro, Guinot & Ng, 2010
- Family Speocarcinidae accepted as Xanthidae MacLeay, 1838
- Family Sphaerodromiidae Guinot & Tavares, 2003 †
- Family Spongicolidae Schram, 1986
- Family Stenochiridae †
- Family Stenopidae accepted as Stenopodidae Claus, 1872
- Family Stenopodidae Claus, 1872
- Family Sternostylidae Baba, Ahyong & Schnabel, 2018
- Family Strahlaxiidae Poore, 1994
- Family Stylodactylidae Spence Bate, 1888
- Family Sundathelphusidae accepted as Parathelphusidae Alcock, 1910
- Family Symethidae Goeke, 1981 accepted as Raninidae de Haan, 1833
- Family Synaxidae Bate, 1881 accepted as Palinuridae Latreille, 1802
- Family Tanaocheleidae
- Family Tanaochelidae Ng & Clark, 2000
- Family Tanidromitidae †
- Family Telamonocarcinidae Larghi, 2004 †
- Family Tepexicarcinidae Luque, 2015 †
- Family Tetrachelidae BemIen, 1930 †
- Family Tetraliidae Castro, Ng & Ahyong, 2004
- Family Tetriasidae Tsang & Naruse, 2023
- Family Thalassinidae Latreille, 1831
- Family Thalassinidea incertae sedis
- Family Thalassocarididae Spence Bate, 1888
- Family Thaumastochelidae
- Family Thelxiopeidae accepted as Homolidae de Haan, 1833
- Family Thiidae Dana, 1852
- Family Thomassiniidae de Saint Laurent, 1979
- Family Tithonohomolidae †
- Family Torynommatidae †
- Family Tosacallianassidae Sakai, 2016
- Family Trapeziidae Miers, 1886
- Family Tricarinidae Feldmann et al., 2007 †
- Family Trichodactylidae H. Milne Edwards, 1853
- Family Trichopeltariidae Tavares & Cleva, 2010
- Family Trogloplacidae
- Family Tumidocarcinidae Schweitzer, 2005 †
- Family Tychidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Family Tymolidae accepted as Cyclodorippidae Ortmann, 1892
- Family Typhlocarididae Annandale & Kemp, 1913
- Family Ucididae Števčic, 2005
- Family Udorellidae Van Straelen, 1924 †
- Family Uncinidae Beurlen, 1928 †
- Family Upogebiidae Borradaile, 1903
- Family Varunidae H. Milne Edwards, 1853
- Family Venipaguridae Collins, 2011 †
- Family Viaiidae Artal, Van Bakel, Fraaije, Jagt & Klompmaker, 2012 †
- Family Vultocinidae Ng & Manuel-Santos, 2007
- Family Xandarocarcinidae Karasawa, Schweitzer & Feldmann, 2011 †
- Family Xanthidae MacLeay, 1838
- Family Xanthoidea (awaiting allocation)
- Family Xanthoidea incertae sedis
- Family Xenograpsidae N. K. NG, DAVIE, SCHUBART & NG, 2007
- Family Xenophthalmidae Stimpson, 1858
- Family Xiphocarididae Ortmann, 1895
- Family Zanthopsidae Via, 1959 †
- 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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