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)
- Family Calappidae De Haan, 1833 (88)
- Genus Acanthocarpus Stimpson, 1871 (5)
- Genus Aparnocondylus Ross, Lewis & Scolaro, 1964 † accepted as Calappa Weber, 1795
- Genus Bittnerilia De Angeli & Garassino, 2003 †
- Genus Calappa Weber, 1795 (41)
- Species Calappa acutispina Lai, Chan & Ng, 2006
- Species Calappa africana Lai & Ng, 2006
- Species Calappa alata Rathbun, 1911 accepted as Calappa woodmasoni Alcock, 1896
- Species Calappa albicans Bosc, 1801 accepted as Cryptopodia fornicata (Fabricius, 1781)
- Species Calappa angusta A. Milne-Edwards, 1880 accepted as Cyclozodion angustum (A. Milne-Edwards, 1880)
- Species Calappa angustata Fabricius, 1798 accepted as Hepatus pudibundus (Herbst, 1785)
- Species Calappa bicornis Miers, 1884
- Species Calappa bilineata Ng, Lai & Aungtonya, 2002
- Species Calappa Bocagei de Brito Capello, 1870 accepted as Calappa rubroguttata Herklots, 1851
- Species Calappa calappa (Linnaeus, 1758)
- Species Calappa capellonis Laurie, 1906
- Species Calappa chungii Hu & Tao, 1985 †
- Species Calappa cinerea Holthuis, 1958
- Species Calappa circularis Beurlen, 1958 † accepted as Calappilia circularis (Beurlen, 1958) †
- Species Calappa clypeata Borradaile, 1903
- Species Calappa conifera Galil, 1997
- Species Calappa convexa de Saussure, 1853
- Species Calappa costaricana Rathbun, 1918 †
- Species Calappa cranium Wright & Wright, 1945 † accepted as Heeia villersensis (Hée, 1924) †
- Species Calappa cristata Fabricius, 1798 accepted as Calappa philargius (Linnaeus, 1758)
- Species Calappa cuspidata (Guppy, 1909) †
- Species Calappa damarcoi Pasini & Garassino, 2017 †
- Species Calappa depressa Latreille in Milbert, 1812 accepted as Aethra scruposa (Linnaeus, 1764)
- Species Calappa depressa Miers, 1886 accepted as Calappa woodmasoni Alcock, 1896
- Species Calappa dumortieri Guinot, 1964
- Species Calappa earlei Withers, 1924 †
- Species Calappa elata Rathbun, 1911 accepted as Calappa alata Rathbun, 1911
- Species Calappa exanthematosa Alcock & Anderson, 1894
- Species Calappa flammea (Herbst, 1794)
- Species Calappa fornicata Fabricius, 1798 accepted as Calappa calappa (Linnaeus, 1758)
- Species Calappa galloides Stimpson, 1859
- Species Calappa gallus (Herbst, 1803)
- Species Calappa granulata (Linnaeus, 1758)
- Species Calappa guerini de Brito Capello, 1870
- Species Calappa Guérini de Brito Capello, 1870 accepted as Calappa guerini de Brito Capello, 1870
- Species Calappa heberti Brocchi, 1883 †
- Species Calappa hepatica (Linnaeus, 1758)
- Species Calappa japonica Ortmann, 1892
- Species Calappa karenae Ng & Lai, 2012
- Species Calappa lanensis Rathbun, 1926 †
- Species Calappa laraensis Van Straelen, 1933 †
- Species Calappa liaoi Ng, 2002
- Species Calappa lienharti Bachmayer, 1962 † accepted as Mursia lienharti (Bachmayer, 1962) †
- Species Calappa lophos (Herbst, 1782)
- Species Calappa madoerensis Van Straelen, 1938 †
- Species Calappa marmorata sensu H. Milne Edwards, 1837 accepted as Calappa flammea (Herbst, 1794)
- Species Calappa matsuzawa Galil, 1997 accepted as Calappa tuberculata (Fabricius, 1787)
- Species Calappa matzkei Bachmayer, 1962 † accepted as Calappilia matzkei (Bachmayer, 1962) †
- Species Calappa monilicanthus Galil, 1997
- Species Calappa Moniziana de Brito Capello, 1870 accepted as Calappa flammea (Herbst, 1794)
- Species Calappa nitida Holthuis, 1958
- Species Calappa oboui Hu & Tao, 1996 †
- Species Calappa ocalanus (Ross, Lewis & Scolaro, 1964) †
- Species Calappa ocellata Holthuis, 1958
- Species Calappa ocularia Ng, 2002
- Species Calappa pavimenta Schweitzer, Iturralde-Vinent, Hetler & Velez-Juarbe, 2006 †
- Species Calappa pelii Herklots, 1851
- Species Calappa philargius (Linnaeus, 1758)
- Species Calappa piscatorum Calman, 1914 accepted as Calappa pelii Herklots, 1851
- Species Calappa pokipoki Ng, 2000
- Species Calappa praelata Lőrenthey in Lőrenthey & Beurlen, 1929 †
- Species Calappa protopustulosa Noetling, 1901 †
- Species Calappa pustulosa Alcock, 1896
- Species Calappa quadrimaculata Takeda & Shikatani, 1990
- Species Calappa restricta A. Milne-Edwards, 1873 †
- Species Calappa rissoana Pastore, 1996 accepted as Calappa rosea Jarocki, 1825
- Species Calappa robertsi Ross, Lewis & Scolaro, 1964 †
- Species Calappa rosea Jarocki, 1825
- Species Calappa rubroguttata Herklots, 1851
- Species Calappa saheliensis Van Straelen, 1937 †
- Species Calappa sanginarensis Van Straelen, 1938 †
- Species Calappa saussurei Rathbun, 1898 accepted as Calappula saussurei (Rathbun, 1898)
- Species Calappa sebastieni Galil, 1997
- Species Calappa sexaspinosa Morris & Collins, 1991 †
- Species Calappa spinocissima H. Milne Edwards, 1837 accepted as Calappa spinosissima H. Milne Edwards, 1837
- Species Calappa spinosissima H. Milne Edwards, 1837 accepted as Calappa hepatica (Linnaeus, 1758)
- Species Calappa springeri Rathbun, 1931
- Species Calappa squamosa Desbonne in Desbonne & Schramm, 1867 accepted as Calappa galloides Stimpson, 1859
- Species Calappa sulcata Rathbun, 1898
- Species Calappa terraereginae Ward, 1936 accepted as Calappa clypeata Borradaile, 1903
- Species Calappa terrae-reginae Ward, 1936 accepted as Calappa terraereginae Ward, 1936
- Species Calappa terrareginae Ward, 1936 accepted as Calappa clypeata Borradaile, 1903
- Species Calappa tortugae Rathbun, 1933 accepted as Calappula tortugae (Rathbun, 1933)
- Species Calappa torulosa Galil, 1997
- Species Calappa tridentata Beurlen, 1939 † accepted as Calappilia tridentata (Beurlen, 1939) †
- Species Calappa tuberculata (Fabricius, 1787)
- Variety Calappa tuberculata var. sandwichien Eydoux & Souleyet, 1842 accepted as Calappa hepatica (Linnaeus, 1758)
- Species Calappa tuberculosa Guérin, 1832 accepted as Calappa hepatica (Linnaeus, 1758)
- Species Calappa tuerkayana Pastore, 1996 accepted as Calappa granulata (Linnaeus, 1758)
- Species Calappa turkayana Pastore, 1995 accepted as Calappa tuerkayana Pastore, 1996
- Species Calappa undulata Dai & Yang, 1991
- Species Calappa webbiana Holthuis, 1977 accepted as Calappa rosea Jarocki, 1825
- Species Calappa webbii Risso, 1844 accepted as Calappa rosea Jarocki, 1825
- Species Calappa woodmasoni Alcock, 1896
- Species Calappa wood-masoni Alcock, 1896 accepted as Calappa woodmasoni Alcock, 1896
- Species Calappa xantusiana Stimpson, 1860 accepted as Calappa convexa de Saussure, 1853
- Species Calappa yamasitae Sakai, 1980
- Species Calappa zinsmeisteri Feldmann & Wilson, 1988 †
- Species Calappa zurcheri Bouvier, 1899 †
- Genus Calappe Weber, 1795 accepted as Calappa Weber, 1795
- Genus Calappella Rathbun, 1918 †
- Genus Calappilia A. Milne-Edwards in de Bouillé, 1873 †
- Genus Calappula Galil, 1997 (2)
- Genus Camara De Haan, 1837 accepted as Calappa Weber, 1795
- Genus Carinocalappa Beschin, Busulini & Tessier in Beschin, Busulini, Fornaciari, Papazzoni & Tessier, 2018 †
- Genus Corallomursia De Angeli & Ceccon, 2014
- Genus Cryptosoma Brullé, 1837 (4)
- Genus Cycloes De Haan, 1837 (2)
- Genus Cyclöes De Haan, 1837 accepted as Cycloes De Haan, 1837
- Genus Cyclois De Haan, 1837 accepted as Cycloes De Haan, 1837
- Genus Cyclozodion Williams & Child, 1989 (2)
- Genus Mursia Desmarest, 1823 (29)
- Genus Mursilata Hu & Tao, 1996 †
- Genus Mursilia Rathbun, 1918 †
- Genus Mursiopsis Ristori, 1888 †
- Genus Nantocyclois Beschin, Busulini & Tessier, 2013 †
- Genus Paracorallomursia Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Paracyclois Miers, 1886 (2)
- Genus Paracycloïs Miers, 1885 accepted as Paracyclois Miers, 1886
- Genus Paracycloïs Miers, 1886 accepted as Paracyclois Miers, 1886
- Genus Paramursia Karasawa, 1989 † accepted as Mursiopsis Ristori, 1888 †
- Genus Platymera H. Milne Edwards, 1837 (1)
- Genus Pseudocorallomursia Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Stenodromia A. Milne-Edwards in de Bouillé, 1873 †
- Genus Tavernolesia Artal & Onetti, 2017 †
- Genus Thealia Lucas, 1839 accepted as Mursia Desmarest, 1823
- Genus Tutus Collins in Collins, Portell & Donovan, 2009 †
- Family Calappidea De Haan, 1833 accepted as Calappidae De Haan, 1833
- Family Hepatinae Stimpson, 1871 accepted as Aethridae Dana, 1851
- Family Matutidae De Haan, 1835 (15)
- Family Matutoidea De Haan, 1835 accepted as Matutidae De Haan, 1835
- 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)
- 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