Between brackets is the number of accepted extant species
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- Decapoda (17 688)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 155)
- Infraorder Achelata (153)
- Infraorder Anomura (3 416)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 884)
- Section Callichimaeroida †
- Section Cyclodorippoida (110)
- Section Dakoticancroida †
- Section Dromiacea (189)
- Section Etyoida †
- Section Eubrachyura (7 447)
- Subsection Heterotremata (6 087)
- 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)
- 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)
- Tribe Atoportunini Števčić, 2005 accepted as Portuninae Rafinesque, 1815
- Genus Acanthoportunus Schweitzer & Feldmann, 2002 †
- Genus Acheloüs De Haan, 1833 accepted as Achelous De Haan, 1833
- Genus Alionectes Koch, Spiridonov & Ďuriš, 2022 (2)
- Genus Allomonomia Koch, Spiridonov & Ďuriš, 2022 (2)
- Genus Archaeoportunus Artal, Ossó & Domínguez, 2021 †
- Genus Arenaeus Dana, 1851 (2)
- Genus Atoportunus Ng & Takeda, 2003 (3)
- Genus Callinectes Stimpson, 1860 (15)
- Species Callinectes affinis Fausto-Filho, 1980
- Species Callinectes alabamensis Rathbun, 1935 †
- Species Callinectes Alcocki Chen, 1933 accepted as Scylla tranquebarica (Fabricius, 1798)
- Species Callinectes alexandri Rathbun, 1907 accepted as Portunus sanguinolentus (Herbst, 1783)
- Species Callinectes amnicola (de Rochebrune, 1883)
- Species Callinectes arcuatus Ordway, 1863
- Species Callinectes bellicosus (Stimpson, 1859)
- Species Callinectes bocourti A. Milne-Edwards, 1879
- Species Callinectes danae Smith, 1869
- Species Callinectes declivis Rathbun, 1918 †
- Species Callinectes diacanthus (Latreille, 1825) accepted as Callinectes sapidus Rathbun, 1896
- Variety Callinectes diacanthus var. africanus A. Milne-Edwards, 1879 accepted as Callinectes marginatus (A. Milne-Edwards, 1861)
- Variety Callinectes diacanthus var. cayennensis A. Milne-Edwards, 1879 accepted as Callinectes bocourti A. Milne-Edwards, 1879
- Variety Callinectes diacanthus var. robustus A. Milne-Edwards, 1879 accepted as Callinectes toxotes Ordway, 1863
- Species Callinectes dubia Kingsley, 1879 accepted as Callinectes arcuatus Ordway, 1863
- Species Callinectes exasperatus (Gerstaecker, 1856)
- Species Callinectes ferreirai Brito, 1971 † accepted as Portunus ferreirai (Brito, 1971) †
- Species Callinectes gladiator Benedict, 1893 accepted as Callinectes pallidus (de Rochebrune, 1883)
- Species Callinectes humphreyi Jones, 1968 accepted as Callinectes marginatus (A. Milne-Edwards, 1861)
- Species Callinectes jamaicensis Withers, 1924 †
- Species Callinectes larvatus Ordway, 1863
- Species Callinectes latimanus Rathbun, 1897 accepted as Callinectes amnicola (de Rochebrune, 1883)
- Species Callinectes madagascariensis (Hoffman, 1874) accepted as Portunus madagascariensis (Hoffmann, 1874)
- Species Callinectes maracaiboensis Taissoun, 1972 accepted as Callinectes bocourti A. Milne-Edwards, 1879
- Species Callinectes marginatus (A. Milne-Edwards, 1861)
- Species Callinectes nitidus A. Milne-Edwards, 1879 accepted as Callinectes arcuatus Ordway, 1863
- Species Callinectes ochoterenai Contreras, 1930 accepted as Callinectes bellicosus (Stimpson, 1859)
- Species Callinectes ornatus Ordway, 1863
- Species Callinectes pallidus (de Rochebrune, 1883)
- Species Callinectes paraensis Beurlen, 1958 †
- Species Callinectes pirabensis Brito, 1971 † accepted as Portunus pirabensis (Brito, 1971)
- Species Callinectes Platei Chen, 1933 accepted as Scylla tranquebarica (Fabricius, 1798)
- Species Callinectes pleuriticus Ordway, 1863 accepted as Callinectes arcuatus Ordway, 1863
- Species Callinectes quilonensis Verma, 1977 †
- Species Callinectes rathbunae Contreras, 1930
- Species Callinectes reticulatus Rathbun, 1918 †
- Species Callinectes sapidus Rathbun, 1896
- Species Callinectes similis Williams, 1966
- Species Callinectes toxotes Ordway, 1863
- Species Callinectes tumidus Ordway, 1863 accepted as Callinectes exasperatus (Gerstaecker, 1856)
- Genus Carupella Lenz in Lenz & Strunck, 1914 (3)
- Genus Cavoportunus Nguyen & Ng, 2010 (1)
- Genus Colneptunus Lőrenthey in Lőrenthey & Beurlen, 1929 †
- Genus Cycloachelous Ward, 1942 (9)
- Genus Eodemus Koch, Spiridonov & Ďuriš, 2022 (6)
- Genus Euctenota Gerstaecker, 1856 accepted as Arenaeus Dana, 1851
- Genus Gonioneptunites Vía Boada, 1959 † accepted as Colneptunus Lőrenthey in Lőrenthey & Beurlen, 1929 †
- Genus Incultus Koch, Spiridonov & Ďuriš, 2022 (3)
- Genus Lupea Leach, 1814 accepted as Lupa Leach, 1814
- Genus Monomia Gistel, 1848 (10)
- Genus Neptunus De Haan, 1833 accepted as Portunus Weber, 1795
- Genus Persianus Garassino, Pasini, Mirzaie Ataabadi & Nyborg in Garassino, Pasini, Mirzaie Ataabadi, Hadi, Parsazad, Nyborg & Vega, 2024 †
- Genus Portunus Weber, 1795 (14)
- Genus Rathbunella Collins in Collins, Portell & Donovan, 2009 † accepted as Rathbunites Schweitzer, Dworschak & Martin, 2011 †
- Genus Rathbunites Schweitzer, Dworschak & Martin, 2011 †
- Genus Sanquerus Manning, 1989 (1)
- Genus Trionectes Koch, Spiridonov & Ďuriš, 2022 (7)
- Genus Xiphonectes A. Milne-Edwards, 1873 (14)
- Subfamily Thalamitinae Paulson, 1875 (190)
- 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 (771)
- 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 (3 920)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (101)
- Suborder Reptantia
- Suborder Trichelida