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)
- 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)
- Family Trichodactylidae H. Milne Edwards, 1853 (52)
- Subfamily Dilocarcininae Pretzmann, 1978 (35)
- Tribe Dilocarcinini Pretzmann, 1978 accepted as Dilocarcininae Pretzmann, 1978
- Tribe Valdiviini Pretzmann, 1978 accepted as Trichodactylidae H. Milne Edwards, 1853
- Genus Arica White, 1847 accepted as Dilocarcinus H. Milne Edwards, 1853
- Genus Bottiella Magalhães & Türkay, 1996 (3)
- Genus Dilocarcinus H. Milne Edwards, 1853 (5)
- Genus Forsteria Bott, 1969 accepted as Forsteriana Ng & Low, 2010
- Genus Forsteriana Ng & Low, 2010 (1)
- Genus Fredilocarcinus Pretzmann, 1978 (3)
- Genus Goyazana Bott, 1969 (2)
- Genus Holthuisia Pretzmann, 1968 accepted as Sylviocarcinus H. Milne Edwards, 1853
- Genus Melocarcinus C Magalhães & Türkay, 1996 (1)
- Genus Moreirocarcinus Magalhães & Türkay, 1996 (3)
- Genus Orthostoma Randall, 1840 accepted as Poppiana Bott, 1969
- Genus Poppiana Bott, 1969 (3)
- Genus Rotundovaldivia Pretzmann, 1968 (1)
- Species Rotundovaldivia hartii (Rathbun, 1905) accepted as Valdivia serrata White, 1847
- Species Rotundovaldivia latidens (A. Milne-Edwards, 1869)
- Genus Sylviocarcinus H. Milne Edwards, 1853 (5)
- Genus Valdivia White, 1847 (5)
- Genus Zilchiopsis Bott, 1969 (3)
- Subfamily Trichodactylinae H. Milne Edwards, 1853 (17)
- 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