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)
- Superfamily Trichopeltarioidea Tavares & Cleva, 2010 (29)
- Superfamily Xanthoidea MacLeay, 1838 (770)
- Family Antrocarcinidae Ng & Chia, 1994 (4)
- Family Garthiellidae Mendoza & Manuel-Santos, 2012 (3)
- Family Linnaeoxanthidae Števčić, 2005 (2)
- Family Melybiidae Števčić in Martin & Davis, 2001 accepted as Melybiidae Števčić, 2005
- Family Melybiidae Števčić, 2005 accepted as Linnaeoxanthidae Števčić, 2005
- Family Nanocassiopidae Števčić, 2013 (12)
- Family Panopeidae Ortmann, 1893 (68)
- Family Prionoplacidae Alcock, 1900 accepted as Eucratopsinae Stimpson, 1871
- Family Pseudorhombilidae Alcock, 1900 (64)
- Subfamily Eucratodinae Števčić, 2005 accepted as Pseudorhombilidae Alcock, 1900
- Subfamily Pseudorhombilinae Alcock, 1900 accepted as Pseudorhombilidae Alcock, 1900
- Subfamily Tetraxanthinae Števčić, 2005 accepted as Pseudorhombilidae Alcock, 1900
- Subfamily Trapezioplacinae Števčić, 2005 accepted as Pseudorhombilidae Alcock, 1900
- Genus Bathyrhombila Hendrickx, 1998 (1)
- Genus Chacellus Guinot, 1969 (2)
- Genus Chasmophora Rathbun, 1914 (1)
- Genus Cycloplax Guinot, 1969 (1)
- Genus Cyrtoplax Rathbun, 1914 (4)
- Genus Eucratodes A. Milne-Edwards, 1880 (1)
- Genus Euphrosynoplax Guinot, 1969 (3)
- Genus Garthiope Guinot, 1990 (4)
- Genus Gonopanope Guinot, 1967 (3)
- Genus Guinope Thoma & Felder, 2020 (1)
- Species Guinope tiara Thoma & Felder, 2020
- Genus Henryalphonsia Števčić, 2005 accepted as Panoplax Stimpson, 1871
- Genus Krunorhombila Števčić, 2011 accepted as Pseudorhombila H. Milne Edwards, 1837
- Genus Lophoxanthus A. Milne-Edwards, 1879 (1)
- Genus Malacoplax Guinot, 1969 (1)
- Genus Micropanope Stimpson, 1871 (8)
- Genus Nanoplax Guinot, 1967 (2)
- Genus Oediplax Rathbun, 1894 (1)
- Genus Panoplax Stimpson, 1871 (3)
- Genus Perunorhombila Števčić, 2005 (1)
- Genus Prionoplax H. Milne Edwards, 1852 (3)
- Genus Pseudopanopeus Felder, 2020 (1)
- Genus Pseudorhombila H. Milne Edwards, 1837 (5)
- Genus Robertsella Guinot, 1969 (2)
- Genus Scopolius Števčić, 2011 (1)
- Genus Speocarcinus Stimpson, 1859 (8)
- Genus Tetraplax Rathbun, 1901 (2)
- Genus Tetraxanthus Rathbun, 1898 (2)
- Genus Thalassoplax Guinot, 1969 (1)
- Genus Trapezioplax Guinot, 1969 (1)
- Family Speocarcinidae Števčić, 2005 accepted as Pseudorhombilidae Alcock, 1900
- Family Speocarcinidae Števčić in Martin & Davis, 2001 accepted as Speocarcinidae Števčić, 2005
- Family Xanthidae MacLeay, 1838 (617)
- Family Xanthoidea incertae sedis
- 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