Between brackets is the number of accepted extant species
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- Decapoda (17 679)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (534)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 145)
- Infraorder Achelata (153)
- Infraorder Anomura (3 414)
- Infraorder Astacidea (781)
- 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 (969)
- 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)
- Family Archaeoportunidae Artal, Ossó & Domínguez, 2021 † accepted as Portuninae Rafinesque, 1815
- Family Archaeoportunidae Artal, Ossó & Domínguez, 2013 † accepted as Archaeoportunidae Artal, Ossó & Domínguez, 2021 †
- Family Brusiniidae Števčić, 1991 (4)
- Family Carcineretidae Beurlen, 1930 †
- Family Carcinidae MacLeay, 1838 (7)
- Family Eogeryonidae Ossó, 2021 †
- Family Gatuniidae Rathbun, 1918 accepted as Necronectinae Glaessner, 1928
- Family Geryonidae Colosi, 1924 (50)
- Family Litophylacidae Van Straelen, 1936 †
- Family Longusorbiidae Karasawa, Schweitzer & Feldmann, 2008 †
- Family Macropipidae Stephenson & Campbell, 1960 accepted as Polybiidae Paulson, 1875
- Family Megalopidae Haworth, 1825 accepted as Carcininae MacLeay, 1838
- Family Nautilocorystidae Ortmann, 1893 (2)
- Family Ovalipidae Spiridonov, Neretina & Schepetov, 2014 (11)
- Family Pirimelidae Alcock, 1899 (5)
- Family Platyonichidae Dana, 1851 accepted as Platyonichinae Dana, 1851
- Family Platyonichidae Ortmann, 1893 accepted as Platyonichinae Dana, 1851
- Family Platyonychidae Dana, 1851 accepted as Platyonichidae Dana, 1851
- Family Podophthalmidae Dana, 1851 accepted as Podophthalminae Dana, 1851
- Family Polybiidae Paulson, 1875 (31)
- Family Portunidae Rafinesque, 1815 (363)
- Subfamily Achelouinae Spiridonov, 2020 (28)
- Subfamily Arenaeinae Dana, 1851 accepted as Portuninae Rafinesque, 1815
- Subfamily Caphyrinae Paulson, 1875 accepted as Thalamitinae Paulson, 1875
- Subfamily Carupinae Paulson, 1875 (26)
- Subfamily Catoptrinae Borradaile, 1903 accepted as Carupinae Paulson, 1875
- Subfamily Coelocarcininae Števćić, 1991 (2)
- Subfamily Goniocaphyrinae Borradaile, 1900 accepted as Carupinae Paulson, 1875
- Subfamily Lupinae Dana, 1851 accepted as Portuninae Rafinesque, 1815
- Subfamily Lupocyclinae Alcock, 1899 (15)
- Subfamily Necronectinae Glaessner, 1928 (4)
- Subfamily Podophthalminae Dana, 1851 (6)
- Subfamily Polybiinae Paulson, 1875 accepted as Polybiidae Paulson, 1875
- Subfamily Portuninae Rafinesque, 1815 (92)
- Subfamily Thalamitinae Paulson, 1875 (190)
- Genus Archias Paulson, 1875 accepted as Charybdis (Archias) Paulson, 1875
- Genus Assecla Streets, 1876 accepted as Lissocarcinus Adams & White, 1849
- Genus Camptonyx Heller, 1860 accepted as Caphyra Guérin, 1832
- Genus Caphyra Guérin, 1832 (17)
- Genus Charybdella Rathbun, 1897 accepted as Cronius Stimpson, 1860
- Genus Charybdis De Haan, 1833 (60)
- Genus Cronius Stimpson, 1860 (1)
- Genus Eocharybdis Beschin, Busulini, De Angeli & Tessier, 2002 †
- Species Eocharybdis cristata Beschin, Busulini, De Angeli & Tessier, 2002 †
- Species Eocharybdis rugosa Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Gonioinfradens Leene, 1938 (2)
- Genus Goniosoma A. Milne-Edwards, 1860 accepted as Charybdis De Haan, 1833
- Genus Goniosupradens Davie, 2002 accepted as Goniosupradens Davie & Ng, 2024
- Genus Goniosupradens Davie & Ng, 2024 (4)
- Genus Hedrophthalmus Nauck, 1880 accepted as Thalamitoides A. Milne-Edwards, 1869
- Genus Lessinithalamita De Angeli & Ceccon, 2015 †
- Genus Lissocarcinus Adams & White, 1849 (9)
- Genus Lissocarcinus Adams, 1847 accepted as Lissocarcinus Adams & White, 1849
- Genus Mioxaiva Müller, 1979 †
- Genus Neothalamita Deb, 1985 accepted as Thalamitoides A. Milne-Edwards, 1869
- Genus Talamita Latreille, 1829 accepted as Thalamita Latreille, 1829
- Genus Thalamita Latreille, 1829 (92)
- Genus Thalamites Guérin, 1836 accepted as Thalamita Latreille, 1829
- Genus Thalamitoides A. Milne-Edwards, 1869 (3)
- Genus Thalamonyx A. Milne-Edwards, 1873 accepted as Thalamita Latreille, 1829
- Genus Thranita Evans, 2018 accepted as Thalamita Latreille, 1829
- Genus Trierarchus Evans, 2018 accepted as Thalamita Latreille, 1829
- Genus Zygita Evans, 2018 (2)
- Genus Agnonectes Beschin, Busulini & Tessier, 2022 †
- Genus Amphitrite De Haan, 1833 accepted as Monomia Gistel, 1848
- Genus Enoplonotus A. Milne-Edwards, 1860 †
- Genus Gonioneptunus Ortmann, 1893 accepted as Charybdis (Gonioneptunus) Ortmann, 1893
- Genus Lupa Leach, 1814 accepted as Portunus Weber, 1795
- Genus Neptocarcinus Lőrenthey, 1897 †
- Genus Pseudoachelous Portell & Collins, 2004 †
- Genus Sphaerocarcinus Zehntner, 1894 accepted as Caphyra Guérin, 1832
- Family Psammocarcinidae Beurlen, 1930 †
- Family Thiidae Dana, 1852 (2)
- Family Xaividae Berg, 1900 accepted as Platyonichinae Dana, 1851
- Genus Garthopilumnus Števčić, 2011 (1)
- Genus Garthopilumnus Števčić, 2005 accepted as Garthopilumnus Števčić, 2011
- 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 (769)
- 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 (3 916)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida