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)
- Family Mamaiidae Stebbing, 1905 accepted as Majinae Samouelle, 1819
- Family Mithracidae MacLeay, 1838 (60)
- Genus Ala Lockington, 1877 (1)
- Genus Amphithrax Windsor & Felder, 2017 (11)
- Genus Anaptychoides Strand, 1928 accepted as Ala Lockington, 1877
- Genus Anaptychus Stimpson, 1860 accepted as Ala Lockington, 1877
- Genus Damithrax Windsor & Felder, 2014 accepted as Mithrax Latreille, 1816
- Genus Disspinamithrax Feldmann, Schweitzer & Casadío, 2023 †
- Genus Engyzomaria Gistel, 1848 accepted as Pitho Bell, 1836
- Genus Eumilnia Kingsley, 1879 accepted as Microphrys H. Milne Edwards, 1851
- Genus Hemus A. Milne-Edwards, 1875 (4)
- Genus Maguimithrax Klompmaker, Portell, Klier, Prueter & Tucker, 2015 (1)
- Genus Microphrys H. Milne Edwards, 1851 (5)
- Genus Microrynchus Desbonne in Desbonne & Schramm, 1867 accepted as Pitho Bell, 1836
- Genus Milnia Stimpson, 1860 accepted as Omalacantha Streets, 1871
- Genus Mithraculus White, 1847 (8)
- Species Mithraculus cancasensis (Türkay, 1967)
- Species Mithraculus cinctimanus Stimpson, 1860
- Species Mithraculus coronatus (Herbst, 1785) accepted as Mithraculus sculptus (Lamarck, 1818)
- Species Mithraculus coryphe (Herbst, 1801)
- Species Mithraculus denticulatus (Bell, 1836)
- Species Mithraculus forceps A. Milne-Edwards, 1875
- Species Mithraculus hirsutipes Kingsley, 1879 accepted as Mithraculus forceps A. Milne-Edwards, 1875
- Species Mithraculus nodosus (Bell, 1836)
- Species Mithraculus nudus A. Milne-Edwards, 1875 accepted as Teleophrys ruber (Stimpson, 1871)
- Species Mithraculus rostratus (Bell, 1836)
- Species Mithraculus ruber Stimpson, 1871 accepted as Teleophrys ruber (Stimpson, 1871)
- Species Mithraculus sculptus (Lamarck, 1818)
- Species Mithraculus triangulatus Lockington, 1877 accepted as Microphrys triangulatus (Lockington, 1877)
- Genus Mithrax Latreille, 1816 (3)
- Genus Mitraculus White, 1847 accepted as Mithraculus White, 1847
- Genus Mitrax Latreille, 1816 accepted as Mithrax Latreille, 1816
- Genus Nemausa A. Milne-Edwards, 1875 (4)
- Genus Nonala Windsor & Felder, 2014 (1)
- Genus Omalacantha Streets, 1871 (3)
- Genus Othonia Bell, 1836 accepted as Pitho Bell, 1836
- Genus Petramithrax Windsor & Felder, 2014 (1)
- Genus Piloronus Gistel, 1848 accepted as Pitho Bell, 1836
- Genus Pitho Bell, 1836 (10)
- Genus Platypes Lockington, 1877 accepted as Thoe Bell, 1836
- Genus Teleophrys Stimpson, 1860 (5)
- Genus Thoe Bell, 1836 (3)
- Genus Thoë Bell, 1836 accepted as Thoe Bell, 1836
- Genus Trachonites Desmarest, 1823 accepted as Mithrax Latreille, 1816
- 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