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)
- Family Hymenosomatidae MacLeay, 1838 (138)
- Subfamily Eureotropisinae Mendes, Santana & de Souza Carvalho, 2022 †
- Subfamily Hymenicinae Dana, 1851 accepted as Hymenosomatidae MacLeay, 1838
- Subfamily Hymenosomatinae MacLeay, 1838 (124)
- Genus Aletheiana Ng & Lukhaup, 2015 (1)
- Genus Apechocinus Ng & Chuang, 1996 (1)
- Genus Cancrocaeca Ng, 1991 (1)
- Genus Chartocinus Ng & Rahayu, 2022 (1)
- Genus Crustaenia Ng & Chuang, 1996 (1)
- Genus Culexisoma Poore, Guinot, Komai & Naruse, 2016 (2)
- Genus Elamena H. Milne Edwards, 1837 (27)
- Genus Elamene H. Milne Edwards, 1837 accepted as Elamena H. Milne Edwards, 1837
- Genus Elamenopsis A. Milne-Edwards, 1873 (6)
- Genus Guaplax Naruse, Ng & Guinot, 2008 (1)
- Genus Halicarcinides Lucas, 1981 (1)
- Genus Halicarcinus White, 1846 (7)
- Genus Halimena Melrose, 1975 (1)
- Genus Hymenicoides Kemp, 1917 (2)
- Genus Hymenicus Dana, 1851 accepted as Halicarcinus White, 1846
- Genus Hymenosoma Desmarest, 1823 (8)
- Genus Insulaplax Ng, 2019 (1)
- Genus Limnopilos Chuang & Ng, 1991 (4)
- Genus Liriopea Nicolet in Gay, 1849 accepted as Halicarcinus White, 1846
- Genus Lucascinus Poore, Guinot, Komai & Naruse, 2016 (3)
- Genus Micas Ng & Richer de Forges, 1996 (5)
- Genus Nasutoplax Poore, Guinot, Komai & Naruse, 2016 (1)
- Genus Neohymenicus Lucas, 1981 (2)
- Genus Neorhynchoplax Holthuis, 1968 (33)
- Species Neorhynchoplax alcocki (Kemp, 1917)
- Species Neorhynchoplax ariakensis Sakai, 1969 accepted as Elamenopsis ariakensis (Sakai, 1969)
- Species Neorhynchoplax aspinifera (Lucas, 1981)
- Species Neorhynchoplax attenuipes (Chopra & Das, 1930)
- Species Neorhynchoplax bai Naruse, Mendoza & Ng, 2008
- Species Neorhynchoplax bovis (Barnard, 1947)
- Species Neorhynchoplax chipolini Hsueh, 2018
- Species Neorhynchoplax demeloi (Kemp, 1917)
- Species Neorhynchoplax dentata Ng, 1995
- Species Neorhynchoplax devroyi Mitra & Ng, 2021
- Species Neorhynchoplax elongata Rahayu & Ng, 2004
- Species Neorhynchoplax euryrostris Davie & Richer de Forges, 1996
- Species Neorhynchoplax exigua (Kemp, 1917)
- Species Neorhynchoplax falcifera Naruse, Mendoza & Ng, 2008
- Species Neorhynchoplax frontalis (Lucas & Davie, 1982)
- Species Neorhynchoplax hirtirostris (Lucas & Davie, 1982)
- Species Neorhynchoplax inachoides (Alcock, 1900)
- Species Neorhynchoplax inermis Takeda & Miyake, 1971 accepted as Insulaplax inermis (Takeda & Miyake, 1971)
- Species Neorhynchoplax introversa (Kemp, 1917)
- Species Neorhynchoplax kempi (Chopra & Das, 1930)
- Species Neorhynchoplax mangalis (Ng, 1988)
- Species Neorhynchoplax minima (Lucas & Davie, 1982)
- Species Neorhynchoplax nasalis (Kemp, 1917)
- Species Neorhynchoplax octagonalis (Kemp, 1917)
- Species Neorhynchoplax okinawaensis (Nakasone & Takeda, 1994)
- Species Neorhynchoplax pageti Pretzmann, 1975
- Species Neorhynchoplax palawanensis Serène, 1971 accepted as Crustaenia palawanensis (Serène, 1971)
- Species Neorhynchoplax patnahi Ng, Nesemann & Sharma, 2011
- Species Neorhynchoplax prima Ng & Chuang, 1996
- Species Neorhynchoplax sinensis (Shen, 1932)
- Species Neorhynchoplax thorsbornei (Lucas & Davie, 1982)
- Species Neorhynchoplax thorsborneorum (Lucas & Davie, 1982) accepted as Neorhynchoplax thorsbornei (Lucas & Davie, 1982)
- Species Neorhynchoplax torrensica (Lucas, 1981)
- Species Neorhynchoplax tuberculata (Chopra & Das, 1930)
- Species Neorhynchoplax tuberculatus (Chopra & Das, 1930) accepted as Neorhynchoplax tuberculata (Chopra & Das, 1930)
- Species Neorhynchoplax venusta Ng, 2015
- Species Neorhynchoplax woodmasoni (Alcock, 1900)
- Species Neorhynchoplax yaeyamaensis Naruse, Shokita & Kawahara, 2005
- Genus Neorhynchoplax Sakai, 1938 accepted as Neorhynchoplax Holthuis, 1968
- Genus Rhynchoplax Stimpson, 1858 (4)
- Genus Samarplax Husana, Tan & Kase, 2011 (1)
- Genus Stimpsoplax Poore, Guinot, Komai & Naruse, 2016 (3)
- Genus Sulaplax Naruse, Ng & Guinot, 2008 (1)
- Genus Teramnonotus Tavares & Santana, 2015 (3)
- Genus Trigonoplax H. Milne Edwards, 1853 (3)
- Subfamily Odiomarinae Guinot, 2011 (14)
- 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