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)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 919)
- Section Amphionidea accepted as Caridea
- Section Penaeidea accepted as Dendrobranchiata
- Superfamily Alpheoidea Rafinesque, 1815 (1 229)
- Superfamily Atyoidea De Haan, 1849 (560)
- Family Atyidae De Haan, 1849 (560)
- Genus Acilius Rafinesque, 1815 accepted as Atyaephyra de Brito Capello, 1866
- Genus Antecaridina Edmondson, 1954 (1)
- Genus Archaeatya Villalobos F., 1960 (1)
- Genus Atya Leach, 1816 (14)
- Genus Atyaephyra de Brito Capello, 1866 (8)
- Genus Atydina Cai, 2010 (1)
- Genus Atyella Calman, 1906 (2)
- Genus Atyoida Randall, 1840 (5)
- Genus Atyopsis Chace, 1983 (2)
- Genus Atys Leach, 1816 accepted as Atya Leach, 1816
- Genus Australatya Chace, 1983 (4)
- Genus Balssiola Strand, 1922 accepted as Micratya Bouvier, 1913
- Genus Calmania Bouvier, 1909 accepted as Micratya Bouvier, 1913
- Genus Caridella Calman, 1906 (3)
- Genus Caridina H. Milne Edwards, 1837 (349)
- Genus Caridinides Calman, 1926 accepted as Caridina H. Milne Edwards, 1837
- Genus Caridinopsis Bouvier, 1912 (1)
- Genus Delclosia Rabadà, 1990 †
- Genus Dugastella Bouvier, 1912 (2)
- Genus Edoneus Holthuis, 1978 (4)
- Genus Elephantis Castelin, Marquet & Klotz, 2013 (1)
- Genus Euatya Koelbel, 1884 accepted as Atya Leach, 1816
- Genus Evatya Smith, 1871 accepted as Atya Leach, 1816
- Genus Ficticaris Sket & Zakšek in Jugovic, Zakšek, Petković & Sket, 2019 (1)
- Genus Gallocaris Sket & Zakšek, 2009 (1)
- Genus Halocaridina Holthuis, 1963 (2)
- Genus Halocaridinides Fujino & Shokita, 1975 (3)
- Genus Jolivetya Cals, 1986 (1)
- Genus Jonga Hart, 1961 (1)
- Genus Lancaris Cai & Bahir, 2005 (2)
- Genus Limnocaridella Bouvier, 1913 (1)
- Genus Limnocaridina Calman, 1899 (8)
- Genus Mancicaris Liang, Guo & Tang, 1999 (1)
- Genus Marosina Cai & Ng, 2005 (2)
- Genus Mesocaris Edmondson, 1935 accepted as Antecaridina Edmondson, 1954
- Genus Micratya Bouvier, 1913 (2)
- Species Micratya cooki Karge, Page & Klotz, 2013
- Species Micratya poeyi (Guérin-Méneville, 1855)
- Genus Monsamnis Richard, De Grave & Clark, 2012 (1)
- Genus Neocaridina Kubo, 1938 (28)
- Genus Ortmannia Rathbun, 1901 accepted as Atyoida Randall, 1840
- Genus Palaemonias Hay, 1902 (2)
- Genus Palauatya Hart, 1980 accepted as Halocaridinides Fujino & Shokita, 1975
- Genus Paracaridina Liang & Guo in Liang, Guo & Tang, 1999 (5)
- Genus Paratya Miers, 1882 (22)
- Genus Parisia Holthuis, 1956 (9)
- Genus Potimirim Holthuis, 1954 (5)
- Genus Pseudatya Roux, 1928 accepted as Atyoida Randall, 1840
- Genus Puteonator Gurney, 1987 (1)
- Genus Pycneus Holthuis, 1986 (1)
- Genus Pycnisia Bruce, 1992 (2)
- Genus Sinodina Liang & Cai, 1999 (13)
- Genus Spelaeocaris Matjašič, 1956 (5)
- Genus Stygiocaris Holthuis, 1960 (2)
- Genus Symaethus Agassiz, 1846 accepted as Atyaephyra de Brito Capello, 1866
- Genus Symethus Rafinesque, 1814 accepted as Atyaephyra de Brito Capello, 1866
- Genus Syncaris Holmes, 1900 (2)
- Genus Troglocaridella Babić, 1922 accepted as Spelaeocaris Matjašič, 1956
- Genus Troglocaris Dormitzer, 1853 (3)
- Genus Typhlatya Creaser, 1936 (17)
- Genus Typhlocaridina Liang & Yan, 1981 (3)
- Genus Typhlopatsa Holthuis, 1956 (1)
- Genus Vanderbiltia Boone, 1935 accepted as Atyoida Randall, 1840
- Genus Xiphatyoida Roux, 1915 accepted as Paratya Miers, 1882
- Genus Xiphocaridina Bouvier, 1909 accepted as Paratya Miers, 1882
- Genus Xiphocaridinella Sadowsky, 1930 (15)
- Superfamily Bresilioidea Calman, 1896 (70)
- Superfamily Campylonotoidea Sollaud, 1913 (17)
- Superfamily Caridea incertae sedis †
- Superfamily Crangonoidea Haworth, 1825 (329)
- Superfamily Nematocarcinoidea Smith, 1884 (80)
- Superfamily Oplophoroidea Dana, 1852 (71)
- Superfamily Palaemonoidea Rafinesque, 1815 (1 149)
- Superfamily Pandaloidea Haworth, 1825 (203)
- Superfamily Pasiphaeoidea Dana, 1852 (104)
- Superfamily Physetocaridoidea Chace, 1940 accepted as Pandaloidea Haworth, 1825
- Superfamily Pleopteryxoidea Schweigert & Garassino, 2006 †
- Superfamily Processoidea Ortmann, 1896 (70)
- Superfamily Psalidopodoidea Wood-Mason (3)
- Superfamily Stylodactyloidea Spence Bate, 1888 (34)
- Family Hectarthropidae Spence Bate, 1888 accepted as Processidae Ortmann, 1896
- Family Prionorhynchus Leach, 1830
- Genus Caricyphus Spence Bate, 1888
- Genus Rhomaleocaris Spence Bate, 1888
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida