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)
- Family Daldorfidae Ng & Rodríguez, 1986 accepted as Daldorfiinae Ng & Rodríguez, 1986
- Family Mimilambridae Williams, 1979 accepted as Parthenopinae MacLeay, 1838
- Family Parthenopidae MacLeay, 1838 (148)
- Subfamily Cryptopodiinae Stimpson, 1871 accepted as Parthenopinae MacLeay, 1838
- Subfamily Daldorfiinae Ng & Rodríguez, 1986 (18)
- Subfamily Lambrinae Neumann, 1878 accepted as Parthenopinae MacLeay, 1838
- Subfamily Parthenopinae MacLeay, 1838 (130)
- Genus Acantholambrus Blow & Manning, 1996 †
- Genus Agolambrus Tan & Ng, 2007 (1)
- Genus Aulacolambrus Paulson, 1875 (8)
- Genus Braggilambrus De Angeli & Caporiondo, 2016 †
- Genus Celatopesia Chiong & Ng, 1998 (2)
- Genus Certolambrus Tan & Ng, 2003 (1)
- Genus Costalambrus Tan & Ng, 2007 (1)
- Genus Cryptopodia H. Milne Edwards, 1834 (13)
- Genus Derilambrus Tan & Ng, 2007 (1)
- Genus Distolambrus Tan & Ng, 2007 (1)
- Genus Enoplolambrus A. Milne-Edwards, 1878 (7)
- Genus Eogarthambrus De Angeli, Garassino & Alberti, 2010 †
- Genus Eurolambrus De Angeli & Beschin, 2010 †
- Genus Furtipodia Tan & Ng, 2003 (2)
- Genus Garthambrus Ng, 1996 (11)
- Genus Heterocrypta Stimpson, 1871 (5)
- Genus Hispidolambrus McLay & Tan, 2009 (1)
- Genus Hypolambrus Tan & Ng, 2007 (1)
- Genus Lambrachaeus Alcock, 1895 (1)
- Genus Latcrypta Tan & Ng, 2007 accepted as Latulambrus Tan & Ng, 2007
- Genus Latolambrus Tan & Ng, 2007 accepted as Latulambrus Tan & Ng, 2007
- Genus Latulambrus Tan & Ng, 2007 (1)
- Genus Leiolambrus A. Milne-Edwards, 1878 (2)
- Genus Lessinilambrus Beschin, De Angeli & Zarantonello, 2013 †
- Genus Mesorhoea Stimpson, 1871 (2)
- Genus Mimilambrus Williams, 1979 (1)
- Genus Montemagambrus Ceccon & De Angeli, 2019 †
- Genus Neikolambrus Tan & Ng, 2003 (1)
- Genus Nodolambrus Tan & Ng, 2007 (1)
- Genus Ochtholambrus Tan & Ng, 2007 (3)
- Genus Parthenope Weber, 1795 (3)
- Genus Parthenopoides Miers, 1879 (1)
- Genus Patulambrus Tan & Ng, 2007 (2)
- Genus Phrynolambrus Bittner, 1893 †
- Genus Piloslambrus Tan & Ng, 2007 (3)
- Genus Pisolambrus A. Milne-Edwards, 1878 accepted as Solenolambrus Stimpson, 1871
- Genus Platylambrus Stimpson, 1871 (2)
- Subgenus Platylambrus (Parthenopoides) Miers, 1879 accepted as Parthenopoides Miers, 1879
- Species Platylambrus charlottensis (Rathbun, 1935) †
- Species Platylambrus constrictus (Takeda & Webber, 2007) accepted as Pseudolambrus constrictus Takeda & Webber, 2007
- Species Platylambrus echinatus (Herbst, 1790) accepted as Enoplolambrus echinatus (Herbst, 1790)
- Species Platylambrus exilipes (Rathbun, 1894) accepted as Spinolambrus exilipes (Rathbun, 1894)
- Species Platylambrus fijiensis Rathbun, 1934 †
- Species Platylambrus fraterculus (Stimpson, 1871) accepted as Spinolambrus fraterculus (Stimpson, 1871)
- Species Platylambrus granulatus (Kingsley, 1879)
- Species Platylambrus nummiferus (Rathbun, 1906) accepted as Patulambrus nummiferus (Rathbun, 1906)
- Species Platylambrus obscura (Rathbun, 1919) †
- Species Platylambrus pourtalesii (Stimpson, 1871) accepted as Spinolambrus pourtalesii (Stimpson, 1871)
- Species Platylambrus praedator (De Man, 1906) accepted as Enoplolambrus praedator (De Man, 1906)
- Species Platylambrus quemvis Stebbing, 1917 accepted as Enoplolambrus carenatus (H. Milne Edwards, 1834)
- Species Platylambrus serratus (H. Milne Edwards, 1834)
- Species Platylambrus spinulatus Collins & Todd in Todd & Collins, 2005 †
- Species Platylambrus ursus Ward, 1939 accepted as Certolambrus pugilator (A. Milne-Edwards, 1873)
- Species Platylambrus validus (De Haan, 1837) accepted as Enoplolambrus validus (De Haan, 1837)
- Genus Pseudolambrus Paulson, 1875 (20)
- Genus Rhinolambrus A. Milne-Edwards, 1878 (13)
- Genus Rhynolambrus A. Milne-Edwards, 1878 accepted as Rhinolambrus A. Milne-Edwards, 1878
- Genus Solenolambrus Stimpson, 1871 (6)
- Genus Spinolambrus Tan & Ng, 2007 (8)
- Genus Tutankhamen Rathbun, 1925 (1)
- Genus Velolambrus Tan & Ng, 2007 (2)
- Genus Zarenkolambrus McLay & Tan, 2009 (2)
- Genus Branchiolambrus Rathbun, 1908 †
- Genus Lambrus Leach, 1816 accepted as Parthenope Weber, 1795
- Genus Mesolambrus Müller & Collins, 1991 †
- Genus Oethra Latreille in Cuvier, 1816 accepted as Aethra Latreille in Cuvier, 1816
- Genus Parthenolambrus A. Milne-Edwards, 1878
- 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)
- 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