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)
- Family Acanthonychidae Stimpson, 1871 accepted as Epialtidae MacLeay, 1838
- Family Blastidae Stebbing, 1902 accepted as Pisinae Dana, 1851
- Family Epialtidae MacLeay, 1838 (478)
- Subfamily Acanthonychinae Stimpson, 1871 accepted as Epialtidae MacLeay, 1838
- Subfamily Amathinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Chorininae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Criocarcininae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Subfamily Cyphocarcininae Neumann, 1878 accepted as Pisinae Dana, 1851
- Subfamily Epialtinae MacLeay, 1838 (120)
- Tribe Alcockiini Števčić, 2005 accepted as Epialtidae MacLeay, 1838
- Genus Acanthonyx Latreille, 1828 (17)
- Genus Alcockia Števčić, 2005 accepted as Alfredalcockia Števčić, 2011
- Genus Alfredalcockia Števčić, 2011 (1)
- Genus Antilibinia MacLeay, 1838 (1)
- Genus Bericirinia De Angeli & Garassino, 2021 †
- Genus Cyclonyx Miers, 1879 (1)
- Genus Eoinachoides Van Straelen, 1933 †
- Genus Epialtoides Garth, 1958 (5)
- Genus Epialtus H. Milne Edwards, 1834 (10)
- Genus Eupleurodon Stimpson, 1871 (3)
- Genus Goniothorax A. Milne-Edwards, 1879 (1)
- Genus Gonosoma Costa, 1844 accepted as Acanthonyx Latreille, 1828
- Genus Griffinia Richer de Forges, 1994 (4)
- Genus Huenia De Haan, 1837 (10)
- Genus Huenioides A. Milne-Edwards, 1865 accepted as Xenocarcinus White, 1847
- Genus Leucippa H. Milne Edwards, 1833 (1)
- Genus Lophorochinia Garth, 1969 (1)
- Genus Menaethiops Alcock, 1895 (16)
- Species Menaethiops abumusa Naderloo, 2015
- Species Menaethiops acutifrons (A. Milne-Edwards, 1868)
- Species Menaethiops bicornis Alcock, 1895
- Species Menaethiops brevicornis (A. Milne-Edwards, 1868)
- Species Menaethiops contiguicornis (Klunzinger, 1906)
- Species Menaethiops delagoae Barnard, 1955
- Species Menaethiops dubia Balss, 1929 accepted as Menaethiops dubius Balss, 1929
- Species Menaethiops dubius Balss, 1929
- Species Menaethiops fascicularis (Krauss, 1843)
- Species Menaethiops gadaniensis Kazmi & Tirmizi, 1999
- Species Menaethiops moebii Türkay, 1981
- Species Menaethiops monoceros (Latreille, 1825) accepted as Menaethius monoceros (Latreille, 1825)
- Species Menaethiops natalensis Barnard, 1955
- Species Menaethiops ninii Guinot, 1964
- Species Menaethiops nodulosa (Nobili, 1905) accepted as Menaethiops nodulosus (Nobili, 1905)
- Species Menaethiops nodulosus (Nobili, 1905)
- Species Menaethiops okai Sakai, 1935
- Species Menaethiops portoricensis Rathbun, 1924
- Species Menaethiops xiphias Griffin & Tranter, 1986
- Genus Menaethius H. Milne Edwards, 1834 (2)
- Genus Mimulus Stimpson, 1860 accepted as Pugettia Dana, 1851
- Genus Mocosoa Stimpson, 1871 (1)
- Genus Nanomaja Müller & Collins, 1991 †
- Genus Parahoplophrys Nobili, 1905 accepted as Menaethiops Alcock, 1895
- Genus Peltinia Dana, 1851 accepted as Acanthonyx Latreille, 1828
- Genus Perinea Dana, 1851 accepted as Perinia Dana, 1851
- Genus Perinia Dana, 1851 (2)
- Genus Pugettia Dana, 1851 (22)
- Genus Sargassocarcinus Ward, 1936 (3)
- Genus Simocarcinus Miers, 1879 (9)
- Genus Taliepus A. Milne-Edwards, 1878 (3)
- Genus Xenocarcinoides Borradaile, 1900 accepted as Simocarcinus Miers, 1879
- Genus Xenocarcinus White, 1847 (7)
- Subfamily Hyasteniinae Balss, 1929 accepted as Pisinae Dana, 1851
- Subfamily Ixioninae Neumann, 1878 accepted as Pisinae Dana, 1851
- Subfamily Leptopisinae Stimpson, 1871 accepted as Pisinae Dana, 1851
- Subfamily Libiniinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Macrocoelominae Balss, 1929 accepted as Pisinae Dana, 1851
- Subfamily Menaethinae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Subfamily Ophthalmiinae Balss, 1929 accepted as Epialtidae MacLeay, 1838
- Subfamily Othoninae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Subfamily Picrocerinae Neumann, 1878 accepted as Epialtidae MacLeay, 1838
- Subfamily Pisinae Dana, 1851 (324)
- Subfamily Pliosomatinae Števčić, 1994 accepted as Epialtidae MacLeay, 1838 (1)
- Subfamily Pyrinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Stenociopinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Tychinae Dana, 1851 (16)
- Subfamily Wahraniinae Charbonnier, Garassino, Pasini & Chény, 2024 †
- Genus Bolcapisa Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Chimaerodinia Richer de Forges, Lee & Ng, 2021 (1)
- Genus Crocydocinus Lee, Richer de Forges & Ng, 2019 (9)
- Genus Dehaanius MacLeay, 1838 accepted as Acanthonyx Latreille, 1828
- Genus Minyorhyncha Tavares & Santana, 2018 (1)
- Genus Neophrys Lee, Richer de Forges & Ng, 2019 (2)
- Genus Panticarcinus Collins & Saward, 2006 †
- Genus Periacanthus Bittner, 1875 †
- Genus Scyramathia A. Milne-Edwards, 1880 (4)
- Genus Trigonothir Miers, 1879 accepted as Simocarcinus Miers, 1879
- Family Eurypodiidae MacLeay, 1838 accepted as Inachinae MacLeay, 1838
- Family Huenidae MacLeay, 1838 accepted as Epialtidae MacLeay, 1838
- Family Inachidae MacLeay, 1838 (147)
- Family Inachoididae Dana, 1851 (43)
- Family Leptopodiadae Bell, 1836 accepted as Leptopodidae Bell, 1836
- Family Leptopodidae Bell, 1836 accepted as Inachinae MacLeay, 1838
- Family Leptopodiidae Bell, 1836 accepted as Leptopodidae Bell, 1836
- Family Macrocheiridae Dana, 1851 (1)
- Family Macropodiadae Samouelle, 1819 accepted as Inachinae MacLeay, 1838
- Family Maïadae Samouelle, 1819 accepted as Majinae Samouelle, 1819
- Family Majidae Samouelle, 1819 (155)
- Family Mamaiidae Stebbing, 1905 accepted as Majinae Samouelle, 1819
- Family Mithracidae MacLeay, 1838 (60)
- Family Oncinopodidae Stimpson, 1857 accepted as Inachidae MacLeay, 1838
- Family Oregoniidae Garth, 1958 (84)
- Family Periacanthidae Lőrenthey in Lőrenthey & Beurlen, 1929 † accepted as Epialtidae MacLeay, 1838
- Family Periceridae Dana, 1851 accepted as Pisinae Dana, 1851
- Family Pisidae Dana, 1851 accepted as Pisinae Dana, 1851
- Family Priscinachidae Breton, 2009 †
- Family Tychidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Family Tychiidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- 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