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)
- 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)
- Family Antrocarcinidae Ng & Chia, 1994 (4)
- Family Garthiellidae Mendoza & Manuel-Santos, 2012 (3)
- Family Linnaeoxanthidae Števčić, 2005 (2)
- Family Melybiidae Števčić in Martin & Davis, 2001 accepted as Melybiidae Števčić, 2005
- Family Melybiidae Števčić, 2005 accepted as Linnaeoxanthidae Števčić, 2005
- Family Nanocassiopidae Števčić, 2013 (12)
- Family Panopeidae Ortmann, 1893 (68)
- Family Prionoplacidae Alcock, 1900 accepted as Eucratopsinae Stimpson, 1871
- Family Pseudorhombilidae Alcock, 1900 (64)
- Family Speocarcinidae Števčić, 2005 accepted as Pseudorhombilidae Alcock, 1900
- Family Speocarcinidae Števčić in Martin & Davis, 2001 accepted as Speocarcinidae Števčić, 2005
- Family Xanthidae MacLeay, 1838 (617)
- Subfamily Actaeinae Alcock, 1898 (105)
- Subfamily Banareiinae Števčić, 2005 (27)
- Subfamily Carpilinae Ortmann, 1893 accepted as Carpiliidae Ortmann, 1893
- Subfamily Chlorodiellinae Ng & Holthuis, 2007 (46)
- Subfamily Cymoinae Alcock, 1898 (9)
- Subfamily Etisinae Ortmann, 1893 (27)
- Subfamily Euxanthinae Alcock, 1898 (92)
- Genus Alainodaeus Davie, 1993 (7)
- Genus Batodaeus Vázquez-Bader & Gracia, 2004 (1)
- Genus Carpoporoides Takeda & Nagai, 1986 accepted as Hepatoporus Serène, 1984
- Genus Carpoporus Stimpson, 1871 (1)
- Genus Cranaothus Ng, 1993 (1)
- Genus Crosnierius Serène & Vadon, 1981 (2)
- Species Crosnierius carinatus Serène & Vadon, 1981
- Species Crosnierius gracilipes Ng & Chen, 2005
- Genus Danielea Ng & Clark, 2003 (1)
- Genus Edwardsium Guinot, 1967 (4)
- Genus Epistocavea Davie, 1993 (1)
- Genus Euryetisus Cano, 1889 accepted as Euxanthus Dana, 1851
- Genus Euxanthopsis Rathbun, 1897 accepted as Euxanthus Dana, 1851
- Genus Euxanthus Dana, 1851 (6)
- Genus Gothus Yuan, Jiang & Sha, 2024 (2)
- Genus Guinotellus Serène, 1971 (1)
- Genus Hepatoporus Serène, 1984 (6)
- Genus Hypocolpus Rathbun, 1897 (12)
- Genus Jacforus Ng & Clark, 2003 (1)
- Genus Ladomedaeus Števčić, 2005 (2)
- Genus Lipaesthesius Rathbun, 1898 (1)
- Genus Lipkemedaeus Števčić, 2011 (2)
- Genus Medaeops Guinot, 1967 (8)
- Genus Medaeus Dana, 1851 (6)
- Genus Melissa Strahl, 1861 accepted as Euxanthus Dana, 1851
- Genus Miersiella Guinot, 1967 (2)
- Genus Monodaeus Guinot, 1967 (7)
- Genus Olenothus Ng, 2002 (1)
- Genus Palatigum Davie, 1997 (1)
- Genus Paramedaeus Guinot, 1967 (5)
- Genus Paraxanthodes Guinot, 1968 (3)
- Genus Pilomedaeus Takeda & Komatsu, 2011 (1)
- Genus Pleurocolpus Crosnier, 1995 (1)
- Genus Psaumis Kossmann, 1877 (2)
- Genus Rizalthus Mendoza & Ng, 2008 (1)
- Genus Stimpsonia Števčić, 2005 accepted as Lipkemedaeus Števčić, 2011
- Genus Takedax Mendoza & Ng, 2012 (1)
- Genus Visayax Mendoza & Ng, 2008 (2)
- Subfamily Glyptoxanthinae Mendoza & Guinot, 2011 (9)
- Subfamily Kraussiinae Ng, 1993 (21)
- Subfamily Liomerinae Sakai, 1976 (62)
- Subfamily Megametopinae Števčić, 2005 accepted as Xanthinae MacLeay, 1838
- Subfamily Polydectinae Dana, 1851 (11)
- Subfamily Xanthidae incertae sedis †
- Subfamily Xanthinae MacLeay, 1838 (135)
- Subfamily Xanthopsinae Vía Boada, 1959 † accepted as Zanthopsidae Vía Boada, 1959 †
- Subfamily Zalasiinae Serène, 1968 accepted as Banareiinae Števčić, 2005
- Subfamily Zosiminae Alcock, 1898 (71)
- Genus Actaeites Müller & Collins, 1991 †
- Genus Caprocancer Müller & Collins, 1991 †
- Genus Carpilodes Dana, 1851 accepted as Liomera Dana, 1851
- Genus Chlorodius Desmarest, 1823 accepted as Clorodius Desmarest, 1823
- Genus Chlorodopsis A. Milne-Edwards, 1863 accepted as Pilodius Dana, 1851
- Genus Hypocoelus Heller, 1860 accepted as Hypocolpus Rathbun, 1897
- Genus Lathahypossia Schweitzer, Artal, Van Bakel, Jagt & Karasawa, 2007 †
- Genus Leptoides Collins, Fraaije & Jagt, 1995 † accepted as Titanocarcinus A. Milne-Edwards, 1863 †
- Genus Lioxantho Alcock, 1898 accepted as Lachnopodus Stimpson, 1858
- Genus Lophactaea A. Milne-Edwards, 1862 accepted as Platypodia Bell, 1835
- Genus Mecataleptodius Tavares & de Mendonça, 2022 (2)
- Genus Megaxantho Vega, Feldmann, García-Barrera, Filkorn, Pimentel & Avendano, 2001 † accepted as Menippe De Haan, 1833
- Genus Melia Berthold, 1827 accepted as Lybia H. Milne Edwards, 1834
- Genus Metopoxantho De Man, 1904 †
- Genus Muelleroplax Schweitzer, Feldmann, Garassino, Karasawa & Schweigert, 2010 †
- Genus Olivioxantho Števčić, 2005 accepted as Williamstimpsonia Števčić, 2011
- Genus Paraxanthosia Müller & Collins, 1991 †
- Genus Parazanthopsis Vega, Feldmann, García-Barrera, Filkorn, Pimentel & Avendano, 2001 † accepted as Palaeoxanthopsis Buerlen, 1958 †
- Genus Phymodius A. Milne-Edwards, 1863 accepted as Cyclodius Dana, 1851
- Genus Pilumnomimus Müller & Collins, 1991 †
- Genus Pregeryona Hu & Tao, 1996 †
- Genus Prochlorodius Müller & Collins, 1991 †
- Genus Pseudactea Serène, 1962 accepted as Pseudactaea Guinot, 1971
- Genus Pseudoactumnus Balss, 1933 accepted as Pseudactumnus Balss, 1933
- Genus Sculptoplax Müller & Collins, 1991 †
- Genus Syphax A. Milne-Edwards, 1863 † accepted as Syphaxiella Schweitzer, Dworschak & Martin, 2011 †
- Genus Xanthodes Dana, 1852 accepted as Xanthias Rathbun, 1897
- Genus Xanto Leach, 1814 accepted as Xantho Leach, 1814
- Genus Zozimus Leach in Desmarest, 1823 accepted as Zosimus Leach in Desmarest, 1823
- Genus Zozymus Leach in Desmarest, 1823 accepted as Zosimus Leach in Desmarest, 1823
- Family Xanthoidea incertae sedis
- 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