Between brackets is the number of accepted extant species
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- Decapoda (17 683)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 150)
- Infraorder Achelata (153)
- Infraorder Anomura (3 414)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 883)
- Section Callichimaeroida †
- Section Cyclodorippoida (110)
- Section Dakoticancroida †
- Section Dromiacea (189)
- Section Etyoida †
- Section Eubrachyura (7 446)
- Subsection Heterotremata (6 086)
- Superfamily Aethroidea Dana, 1851 (37)
- Superfamily Bellioidea Dana, 1852 (7)
- Superfamily Bythograeoidea Williams, 1980 (16)
- Superfamily Calappoidea De Haan, 1833 (103)
- Superfamily Cancroidea Latreille, 1802 (37)
- Superfamily Carpilioidea Ortmann, 1893 (3)
- Superfamily Cheiragonoidea Ortmann, 1893 (3)
- Superfamily Componocancroidea Feldmann, Schweitzer & Green, 2008 †
- Superfamily Corystoidea Samouelle, 1819 (9)
- Superfamily Dairoidea Serène, 1965 (4)
- Superfamily Dorippoidea MacLeay, 1838 (100)
- Superfamily Eriphioidea MacLeay, 1838 (67)
- Superfamily Gecarcinucoidea Rathbun, 1904 (458)
- Superfamily Goneplacoidea MacLeay, 1838 (238)
- Superfamily Heterotremata incertae sedis †
- Superfamily Hexapodoidea Miers, 1886 (44)
- Superfamily Hymenosomatoidea MacLeay, 1838 (138)
- Superfamily Leucosioidea Samouelle, 1819 (516)
- Superfamily Majoidea Samouelle, 1819 (968)
- Family Acanthonychidae Stimpson, 1871 accepted as Epialtidae MacLeay, 1838
- Family Blastidae Stebbing, 1902 accepted as Pisinae Dana, 1851
- Family Epialtidae MacLeay, 1838 (478)
- Family Eurypodiidae MacLeay, 1838 accepted as Inachinae MacLeay, 1838
- Family Huenidae MacLeay, 1838 accepted as Epialtidae MacLeay, 1838
- Family Inachidae MacLeay, 1838 (147)
- Family Inachoididae Dana, 1851 (43)
- Family Leptopodiadae Bell, 1836 accepted as Leptopodidae Bell, 1836
- Family Leptopodidae Bell, 1836 accepted as Inachinae MacLeay, 1838
- Family Leptopodiidae Bell, 1836 accepted as Leptopodidae Bell, 1836
- Family Macrocheiridae Dana, 1851 (1)
- Family Macropodiadae Samouelle, 1819 accepted as Inachinae MacLeay, 1838
- Family Maïadae Samouelle, 1819 accepted as Majinae Samouelle, 1819
- Family Majidae Samouelle, 1819 (155)
- Subfamily Actinotocarcininae Jenkins, 1974 †
- Subfamily Cyclacinae Dana, 1851 accepted as Majinae Samouelle, 1819
- Subfamily Eurynolambrinae Števčić, 1994 (1)
- Subfamily Eurynominae Neumann, 1878 accepted as Majinae Samouelle, 1819
- Subfamily Majinae Samouelle, 1819 (152)
- Genus Ageitomaia Griffin & Tranter, 1986 (1)
- Genus Alcomaja Ng & Richer de Forges, 2015 (7)
- Genus Anacinetops Miers, 1879 (1)
- Genus Campbellia Balss, 1930 accepted as Jacquinotia Rathbun, 1915
- Genus Chondromaia Feldmann, Schweitzer, Baltzly, Bennett, Jones, Mathias, Weaver & Yost, 2013 †
- Genus Choniognathus Rathbun, 1932 (4)
- Genus Cyclax Dana, 1851 (2)
- Genus Cyclomaia Stimpson, 1860 accepted as Cyclax Dana, 1851
- Genus Entomonyx Miers, 1884 (1)
- Genus Eruma McCulloch, 1913 accepted as Anacinetops Miers, 1879
- Genus Eurynome Leach, 1814 (6)
- Genus Gonatorhynchus Haswell, 1880 accepted as Paramithrax H. Milne Edwards, 1834
- Genus Halimus Latreille, 1829 accepted as Naxia Latreille, 1825
- Genus Holthuija Ng & Richer de Forges, 2015 (6)
- Genus Jacquinotia Rathbun, 1915 (1)
- Genus Kasagia Richer de Forges & Ng, 2007 (3)
- Genus Kimbla Griffin & Tranter, 1986 (2)
- Genus Labophrys Filhol, 1885 accepted as Paramithrax H. Milne Edwards, 1834
- Genus Leptomithrax Miers, 1876 (16)
- Genus Lobophrys Filhol, 1885 accepted as Paramithrax H. Milne Edwards, 1834
- Genus Lophomicippa Rathbun, 1907 accepted as Micippa Leach, 1817
- Genus Maia Lamarck, 1801 accepted as Maja Lamarck, 1801
- Genus Maïa Lamarck, 1801 accepted as Maja Lamarck, 1801
- Genus Maiopsis Faxon, 1893 (1)
- Genus Maja Lamarck, 1801 (4)
- Subgenus Maja (Acanthonyx) Latreille, 1828 accepted as Acanthonyx Latreille, 1828
- Subgenus Maja (Chorinus) Latreille, 1825 accepted as Chorinus Latreille, 1825
- Subgenus Maja (Dione) De Haan, 1839 accepted as Schizophrys White, 1848
- Subgenus Maja (Huenia) De Haan, 1837 accepted as Huenia De Haan, 1837
- Subgenus Maja (Maja) accepted as Maja Lamarck, 1801
- Subgenus Maja (Paramithrax) accepted as Paramithrax H. Milne Edwards, 1834
- Species Maja africana Griffin & Tranter, 1986 accepted as Sakaija africana (Griffin & Tranter, 1986)
- Species Maja ambigua A Costa, 1840 accepted as Pisa muscosa (Linnaeus, 1758)
- Species Maja arambourgi Van Straelen, 1937 † accepted as Wahrania arambourgi (Van Straelen, 1937) †
- Species Maja austriaca Bachmayer, 1953 †
- Species Maja bianensis Lőrenthey in Lőrenthey & Beurlen, 1929 †
- Species Maja bisarmata Rathbun, 1916 accepted as Rathbunaja bisarmata (Rathbun, 1916)
- Species Maja brachydactyla Balss, 1922
- Species Maja brevispinosa Dai, 1981 accepted as Ovimaja compressipes (Miers, 1879)
- Species Maja camtschatica Tilesius, 1815 accepted as Paralithodes camtschaticus (Tilesius, 1815)
- Species Maja compressipes (Miers, 1879) accepted as Ovimaja compressipes (Miers, 1879)
- Species Maja confragosa Griffin & Tranter, 1986 accepted as Alcomaja confragosa (Griffin & Tranter, 1986)
- Species Maja cornuta (Linnaeus, 1758)
- Species Maja crispata Risso, 1827
- Species Maja dominoleuae Hu & Tao, 1985 †
- Species Maja erinacea Ninni, 1924 accepted as Maja crispata Risso, 1827
- Species Maja eriocheles Lamarck, 1801 accepted as Lithodes maja (Linnaeus, 1758)
- Species Maja gracilipes Chen & Ng, 1999 accepted as Alcomaja gracilipes (Chen & Ng, 1999)
- Species Maja japonica Rathbun, 1932 accepted as Sakaija japonica (Rathbun, 1932)
- Species Maja japonica Yokoya, 1933 accepted as Sakaija japonica (Rathbun, 1932)
- Species Maja Kaempferi Temminck, 1836 accepted as Macrocheira kaempferi (Temminck, 1836)
- Species Maja kominatoensis (Kubo, 1936) accepted as Paramaja kominatoensis Kubo, 1936
- Species Maja laddi Rathbun, 1934 †
- Species Maja linapacanensis Rathbun, 1916 accepted as Ovimaja compressipes (Miers, 1879)
- Species Maja miersii Walker, 1887 accepted as Holthuija miersii (Walker, 1887)
- Species Maja miocaenica Lőrenthey, 1907 †
- Species Maja morii Kato, 1996 †
- Species Maja nagashimaensis Sakai, 1969 accepted as Alcomaja nagashimaensis (Sakai, 1969)
- Species Maja nipponensis Sakai, 1934 accepted as Sakaija japonica (Rathbun, 1932)
- Species Maja orbignyana MIllet, 1854 †
- Species Maja oroszyi Bachmayer, 1953 † accepted as Pisa oroszyi (Bachmayer, 1953) †
- Species Maja prealpina Ceccon & De Angeli, 2019 †
- Species Maja robinsoni Jenkins, 1985 †
- Species Maja sakaii Takeda & Miyake, 1969 accepted as Sakaija sakaii (Takeda & Miyake, 1969)
- Species Maja spinigera (De Haan, 1837) accepted as Paramaya spinigera (De Haan, 1837)
- Species Maja squinado (Herbst, 1788)
- Variety Maja squinado var. brachydactyla Balss, 1922 accepted as Maja brachydactyla Balss, 1922
- Variety Maja squinado var. capensis Ortmann, 1894 accepted as Maja cornuta (Linnaeus, 1758)
- Species Maja suluensis Rathbun, 1916 accepted as Holthuija suluensis (Rathbun, 1916)
- Species Maja tomidai Kato, 2002 †
- Species Maja tuberculata De Haan, 1839 accepted as Maja squinado (Herbst, 1788)
- Species Maja verrucosa H. Milne Edwards accepted as Maia verrucosa H. Milne Edwards, 1834
- Genus Majella Ortmann, 1893 (3)
- Genus Meria Griffith & Pidgeon, 1833 accepted as Maja Lamarck, 1801
- Genus Micippa Leach, 1817 (10)
- Genus Microhalimus Haswell, 1880 (1)
- Genus Naxia Latreille, 1825 (5)
- Genus Neomaja Ng & Richer de Forges, 2015 (1)
- Genus Notomithrax Griffin, 1963 (4)
- Genus Ovimaja Ng & Richer de Forges, 2015 (1)
- Genus Paraentomonyx Sakai, 1983 (1)
- Genus Paramaja Kubo, 1936 (3)
- Genus Paramajella Balss, 1957 accepted as Paramaja Kubo, 1936
- Genus Paramaya De Haan, 1837 (4)
- Genus Paramicippa H. Milne Edwards, 1834 accepted as Micippa Leach, 1817
- Genus Paramicippe H. Milne Edwards, 1834 accepted as Paramicippa H. Milne Edwards, 1834
- Genus Paramithrax H. Milne Edwards, 1834 (1)
- Genus Pippacirama Griffin & Tranter, 1986 (1)
- Genus Planaja Ng & Richer de Forges, 2015 (1)
- Genus Planobranchia Schweitzer & Feldmann, 2010 †
- Genus Prionorhynchus Jacquinot in Jacquinot & Lucas, 1853 accepted as Jacquinotia Rathbun, 1915
- Genus Prismatopus Ward, 1933 (13)
- Genus Pseudomicippe Heller, 1860 (14)
- Genus Rathbunaja Ng & Richer de Forges, 2015 (4)
- Genus Sakaija Ng & Richer de Forges, 2015 (7)
- Genus Schizophroida Sakai, 1933 accepted as Schizophroida Griffin & Tranter, 1986
- Genus Schizophroida Griffin & Tranter, 1986 (5)
- Genus Schizophrys White, 1848 (7)
- Genus Seiitaoides Griffin & Tranter, 1986 (5)
- Genus Sisyphus Desbonne in Desbonne & Schramm, 1867 accepted as Thersandrus Rathbun, 1897
- Genus Temnonotus A. Milne-Edwards, 1875 (1)
- Genus Teratomaia Griffin & Tranter, 1986 (1)
- Genus Thacanophrys Griffin & Tranter, 1986 accepted as Prismatopus Ward, 1933
- Genus Thersandrus Rathbun, 1897 (1)
- Genus Tumidomaia Feldmann, Schweitzer, Bennett, Franţescu, Resar & Trudeau, 2011 †
- Genus Tumulosternum McCulloch, 1913 (3)
- Genus Wilsonimaia Blow & Manning, 1996 †
- Genus Zewa McCulloch, 1913 accepted as Pseudomicippe Heller, 1860
- Subfamily Micippinae Dana, 1851 accepted as Majinae Samouelle, 1819
- Subfamily Micromaiinae Buerlen, 1930 †
- Subfamily Mithracinae MacLeay, 1838 accepted as Mithracidae MacLeay, 1838
- Subfamily Naxiinae Stimpson, 1871 accepted as Majinae Samouelle, 1819
- Subfamily Paramicippinae Dana, 1851 accepted as Majinae Samouelle, 1819
- Subfamily Planoterginae Števčić, 1991 (2)
- Subfamily Prionorhynchinae Dana, 1851 accepted as Majinae Samouelle, 1819
- Subfamily Schizophrysinae Miers, 1879 accepted as Majinae Samouelle, 1819
- Genus Maxioides A. Milne-Edwards, 1865 accepted as Naxioides A. Milne-Edwards, 1865
- Genus Micippe Leach, 1817 accepted as Micippa Leach, 1817
- Genus Micromaja Bittner, 1875 † accepted as Micromaia Bittner, 1875 †
- Genus Ophthalmias Rathbun, 1897 accepted as Stilbognathus von Martens, 1866
- Genus Ophthalmus Rathbun, 1897 accepted as Ophthalmias Rathbun, 1897
- Genus Parathoe Miers, 1879 accepted as Perinia Dana, 1851
- Family Mamaiidae Stebbing, 1905 accepted as Majinae Samouelle, 1819
- Family Mithracidae MacLeay, 1838 (60)
- Family Oncinopodidae Stimpson, 1857 accepted as Inachidae MacLeay, 1838
- Family Oregoniidae Garth, 1958 (84)
- Family Periacanthidae Lőrenthey in Lőrenthey & Beurlen, 1929 † accepted as Epialtidae MacLeay, 1838
- Family Periceridae Dana, 1851 accepted as Pisinae Dana, 1851
- Family Pisidae Dana, 1851 accepted as Pisinae Dana, 1851
- Family Priscinachidae Breton, 2009 †
- Family Tychidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Family Tychiidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Superfamily Montezumelloidea Ossó & Domínguez, 2021 †
- Superfamily Orithyioidea Dana, 1852 (1)
- Superfamily Palicoidea Bouvier, 1898 (69)
- Superfamily Parthenopoidea MacLeay, 1838 (148)
- Superfamily Pilumnoidea Samouelle, 1819 (440)
- Superfamily Portunoidea Rafinesque, 1815 (476)
- Superfamily Potamoidea Ortmann, 1896 (956)
- Superfamily Pseudocarcinoidea Ng & Davie, 2020 (1)
- Superfamily Pseudothelphusoidea Ortmann, 1893 (301)
- Superfamily Pseudozioidea Alcock, 1898 (27)
- Superfamily Retroplumoidea Gill, 1894 (10)
- Superfamily Thioidea Dana, 1852 accepted as Thiidae Dana, 1852
- Superfamily Trapezioidea Miers, 1886 (58)
- Superfamily Trichodactyloidea H. Milne Edwards, 1853 (52)
- Superfamily Trichopeltarioidea Tavares & Cleva, 2010 (29)
- Superfamily Xanthoidea MacLeay, 1838 (770)
- Subsection Thoracotremata (1 360)
- Section Homoloida (91)
- Section Podotremata accepted as Brachyura
- Section Raninoida (47)
- Section Torynommoida †
- Family Brachyura incertae sedis
- Family Cretapsaridae Luque in Luque, Xing, Briggs, Clark, Duque, Hui, Mai & McKellar, 2021 †
- Family Montemagrechiridae Klompmaker, Portell & van der Meij, 2016 †
- Genus Psammograpsus A. Milne-Edwards, 1860 †
- Genus Zoea Bosc, 1801
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 919)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida