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)
- Family Folguerolesiidae Artal & Hyžný, 2016 †
- Family Iphiculidae Alcock, 1896 (6)
- Family Leucosiidae Samouelle, 1819 (510)
- Subfamily Cryptocneminae Stimpson, 1907 (25)
- Subfamily Ebaliinae Stimpson, 1871 (403)
- Genus Acanthilia Galil, 2000 (1)
- Genus Afrophila Galil, 2009 (1)
- Genus Alainyra Galil & Ng, 2023 (1)
- Genus Alcolyra Trivedi, Mitra & Ng, 2022 (1)
- Genus Alox Tan & Ng, 1996 (14)
- Genus Ancylodactyla Galil, 2004 (3)
- Genus Aquitainotlos Ossó & Cluzaud in Cluzaud & Ossó, 2022 †
- Genus Arcania Leach, 1817 (22)
- Genus Atlantolocia Galil, 2009 (1)
- Genus Atlantophila Galil, 2009 (1)
- Genus Atlantotlos Doflein, 1904 (1)
- Genus Bellidilia Kinahan, 1856 (3)
- Genus Cabrillia Nyborg, Pasini & Garassino, 2018 †
- Genus Callidactylus Stimpson, 1871 (1)
- Species Callidactylus asper Stimpson, 1871
- Species Callidactylus kessleri Paulson, 1875 accepted as Myrine kesslerii (Paulson, 1875)
- Species Callidactylus kesslerii Paulson, 1875 accepted as Myrine kesslerii (Paulson, 1875)
- Genus Cateios Tan & Ng, 1996 (1)
- Genus Coralliocryptus Komai & Ng, 2012 (1)
- Genus Dittosa Tan, 1995 accepted as Bellidilia Kinahan, 1856
- Genus Dolos Tan & Richer de Forges, 1993 (1)
- Genus Ebalia Leach, 1817 (66)
- Genus Ebaliopsis Ihle, 1918 (2)
- Genus Favus Lanchester, 1900 (1)
- Genus Galilia Ng & Richer de Forges, 2007 (2)
- Genus Guaia H. Milne Edwards, 1837 accepted as Persephona Leach, 1817
- Genus Heterolithadia Alcock, 1896 (1)
- Genus Heteronucia Alcock, 1896 (17)
- Genus Hiplyra Galil, 2009 (7)
- Genus Ihleus Ovaere, 1989 (2)
- Genus Ilia Leach, 1817 (2)
- Genus Iliacantha Stimpson, 1871 (4)
- Genus Iphis Leach, 1817 accepted as Arcania Leach, 1817
- Genus Ixa Leach, 1816 (9)
- Genus Ixoides MacGilchrist, 1905 (1)
- Genus Kabutos Komatsu & Ng, 2011 (1)
- Genus Leucisca MacLeay, 1838 (4)
- Genus Leucosilia Bell, 1855 (2)
- Genus Leucosiraja De Angeli, Garassino & Pasini in Baldanza, Bizzarri, De Angeli, Faminani, Garassino, Pasini & Pizzolato, 2017 †
- Genus Lissomorpha Ward, 1933 (1)
- Genus Lithadia Bell, 1855 (7)
- Genus Lyphira Galil, 2009 (10)
- Genus Merocryptoides Sakai, 1963 (3)
- Genus Merocryptus A. Milne-Edwards, 1873 (5)
- Genus Myra Leach, 1817 (18)
- Genus Myrine Galil, 2001 (2)
- Genus Myrodes Bell, 1855 accepted as Myra Leach, 1817
- Genus Myropsis Stimpson, 1871 (1)
- Genus Neparilia Ng, Devi & Kumar, 2018 (1)
- Genus Nobiliella Komatsu & Takeda, 2003 (3)
- Genus Nucia Dana, 1852 (7)
- Genus Nuciops Serène & Soh, 1976 (1)
- Genus Nursia Leach, 1817 (21)
- Genus Nursilia Bell, 1855 (3)
- Genus Oreophorus Rüppell, 1830 (6)
- Genus Oreotlos Ihle, 1918 (15)
- Genus Orientotlos Sakai, 1980 (2)
- Genus Ovilyra Ng, 2021 (1)
- Genus Parilia Wood-Mason in Wood-Mason & Alcock, 1891 (4)
- Genus Persephona Leach, 1817 (8)
- Genus Philyra Leach, 1817 (23)
- Genus Phlyxia Bell, 1855 (2)
- Genus Praebebalia Rathbun, 1911 (15)
- Genus Praosia Tan & Ng, 1993 (1)
- Genus Pseudomyra Capart, 1951 (1)
- Genus Pseudophilyra Miers, 1879 (14)
- Genus Pyrhila Galil, 2009 (3)
- Genus Randallia Stimpson, 1857 (5)
- Genus Raylilia Galil, 2001 (6)
- Genus Ryphila Galil, 2009 (3)
- Genus Speloeophoroides Melo & Torres, 1998 (1)
- Genus Speloeophorus A. Milne-Edwards, 1865 (9)
- Genus Tanaoa Galil, 2003 (12)
- Genus Tirmilyra Patel, Naderloo, Trivedi & Mitra, 2023 (2)
- Genus Tlos Adams & White, 1849 (1)
- Genus Tlos Adams, 1847
- Genus Tokoyo Galil, 2003 (2)
- Genus Toru Galil, 2003 (6)
- Genus Uhlias Stimpson, 1871 (2)
- Genus Urashima Galil, 2003 (2)
- Subfamily Iliinae Stimpson, 1871 accepted as Ebaliinae Stimpson, 1871
- Subfamily Leucosiidae incertae sedis †
- Subfamily Leucosiinae Samouelle, 1819 (78)
- Subfamily Myrodinae Miers, 1886 accepted as Ebaliinae Stimpson, 1871
- Subfamily Oreophorinae Miers, 1886 accepted as Ebaliinae Stimpson, 1871
- Subfamily Philyrinae Rathbun, 1937 accepted as Ebaliinae Stimpson, 1871
- Genus Andorina Lőrenthey, 1901 †
- Genus Bellayra Trivedi, Naderloo, Viswanathan & Mitra, 2022 (4)
- 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)
- 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