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)
- 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)
- Subfamily Liocarcininae Rathbun, 1930 accepted as Polybiidae Paulson, 1875
- Subfamily Macropipinae Stephenson & Campbell, 1960 accepted as Polybiidae Paulson, 1875
- Subfamily Parathranitiinae Spiridonov, 2020 accepted as Polybiidae Paulson, 1875
- Genus Archaeogeryon Colosi, 1924 †
- Genus Bathynectes Stimpson, 1871 (5)
- Genus Bericocarcinus De Angeli, 2018 †
- Genus Boschettia Busulini, Tessier, Beschin & De Angeli, 2003 †
- Genus Faksecarcinus Schweitzer, Feldmann, Franţescu & Klompmaker, 2012 †
- Genus Falsiportunites Collins & Jakobsen, 2003 †
- Genus Imaizumila Karasawa, 1993 † accepted as Minohellenus Karasawa, 1990 †
- Genus Itoigawaia Karasawa, Sakumoto & Takayasu, 1992 † accepted as Minohellenus Karasawa, 1990 †
- Genus Leiochilus Reuss, 1859 † accepted as Portunites Bell, 1858 †
- Genus Liocarcinus Stimpson, 1871
- Species Liocarcinus arcuatus (Leach, 1814) accepted as Polybius navigator (Herbst, 1794)
- Species Liocarcinus bolivari (Zariquiey Álvarez, 1948) accepted as Polybius bolivari (Zariquey Álvarez, 1948)
- Species Liocarcinus corrugatus (Pennant, 1777) accepted as Polybius corrugatus (Pennant, 1777)
- Species Liocarcinus depurator (Linnaeus, 1758) accepted as Polybius depurator (Linnaeus, 1758)
- Species Liocarcinus heintzi Schweitzer & Feldmann, 2010 † accepted as Polybius heintzi (Schweitzer & Feldmann, 2010) †
- Species Liocarcinus holsatus (Fabricius, 1798) accepted as Polybius holsatus (Fabricius, 1798)
- Species Liocarcinus kuehni (Bachmayer, 1953) † accepted as Polybius kuehni (Bachmayer, 1953) †
- Species Liocarcinus maculatus (Risso, 1827) accepted as Polybius maculatus (Risso, 1827)
- Species Liocarcinus marmoreus (Leach, 1814) accepted as Polybius marmoreus (Leach, 1814)
- Species Liocarcinus mcleayi (Barnard, 1947) accepted as Xaiva mcleayi (Barnard, 1947)
- Species Liocarcinus navigator (Herbst, 1794) accepted as Polybius navigator (Herbst, 1794)
- Species Liocarcinus oligocenicus (Paucă, 1929) †
- Species Liocarcinus oroszyi (Bachmayer, 1953) † accepted as Polybius oroszyi (Bachmayer, 1953) †
- Species Liocarcinus ottnangensis (Bachmayer, 1953) †
- Species Liocarcinus praearcuatus Müller, 1996 † accepted as Polybius praearcuatus (Müller, 1996) †
- Species Liocarcinus priscus Beschin, De Angeli, Checchi & Zarantonello, 2016 †
- Species Liocarcinus puber (Linnaeus, 1767) accepted as Necora puber (Linnaeus, 1767)
- Species Liocarcinus pusillus (Leach, 1816) accepted as Polybius pusillus (Leach, 1816)
- Species Liocarcinus rakosensis (Lőrenthey in Lőrenthey & Beurlen, 1929) †
- Species Liocarcinus rondeletii (Risso, 1816) accepted as Liocarcinus navigator rondeletii (Risso, 1816)
- Species Liocarcinus strigilis (Stimpson, 1858) accepted as Polybius strigilis (Stimpson, 1858)
- Species Liocarcinus subcorrugatus (A. Milne-Edwards, 1861)
- Species Liocarcinus vernalis (Risso, 1827) accepted as Polybius vernalis (Risso, 1827)
- Species Liocarcinus vindobonensis (Bachmayer, 1950) †
- Species Liocarcinus zariquieyi (Gordon, 1968) accepted as Polybius zariquieyi (Gordon, 1968)
- Genus Lovaroides Beschin, De Angeli, Checchi & Zarantonello, 2016 †
- Genus Macropipus Prestandrea, 1833 (4)
- Genus Maeandricampus Schweitzer & Feldmann, 2002 †
- Genus Megokkos Schweitzer & Feldmann, 2000 †
- Genus Minohellenus Karasawa, 1990 †
- Genus Necora Holthuis, 1987 (1)
- Genus Olicarcinus Beschin & Cecchi, 2018 †
- Genus Ophthalmoplax Rathbun, 1935 †
- Genus Parathranites Miers, 1886 (8)
- Genus Pleolobites Remy, 1960 †
- Genus Polybius Leach, 1820 (13)
- Genus Pororaria Glaessner, 1980 †
- Genus Portufuria Collins, Schulz & Jakobsen, 2005 †
- Genus Portunites Bell, 1858 †
- Genus Proterocarcinus Feldmann, Casadío, Chirino-Gálvez & Aguirre-Urreta, 1995 † accepted as Archaeogeryon Colosi, 1924 †
- Genus Rhachiosoma Woodward, 1871 †
- Family Portunidae Rafinesque, 1815 (363)
- 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 (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